Citrus are favorite fruit trees and their essential oils perform in many formulas, therapeutics and blends — they are widely grown and healing to mind and body.

•

CITRUS & ODD CITRUS

Written and Collected by Jeanne Rose – Sept. 2019

INTRODUCTION ~ There are many types of citrus that are grown all over the world. Many are very familiar and during this past year, since January 2019, I have covered all the major essential oil citrus plants,  (January – Bergamot; February – Grapefruit; March – Lemon; April – Lime; May – Mandarin/tangerine; June – Neroli/Bitter Orange; July – Orange/Blood Orange; August – Petitgrain), I have missed others such as Pomelo from Vietnam, Buddha Hand, Lemonade tree, Yuzu, Kumquat and probably others. These latter do not have a strong presence in the essential oil industry. But it is time to give them a paragraph or two.

•

CITRUS FAMILY ~ RUTACEAE
The citrus are in the family Rutaceae, commonly known as the rue or citrus family of flowering plants. Species of the family generally have flowers that divide into four or five parts, usually with strong scents. They range in form and size from herbs to shrubs and large trees.

CITRUS FAMILY TIES ~
            The parents of each of the types of citrus can be very confusing and if you want to have a fine time scrambling your brains look at the incestuous crosses, back crossing, mutations, aberrations, speciation events, hybrids, genetic mixings, varieties, groups or outgroups, rootstock changes and terroir effects of the many Citrus types to understand the various citrus fruits, we have now.
            For example, Bergamot parentage is 3rd generation from the original citrus species with Lemon and Bitter Orange as the male and female parent but each of those are also 2^nd generation. The Grapefruit group of citrus originates from a back cross of C. paradisi with a female of C. maxima (Pomelo) and a more up-to-date Latin binomial is Citrus x aurantium. The parents of the ‘Mexican Lime are C. micrantha and C. medica and then the Mexican Lime crossed with Lemon gives the ‘Tahiti’ Lime (C. x latifolia). Neroli, Citrus x  aurantium L,  also called C. amara, C. aurantium ssp. Amara. It Is a cross between Citron and of C. reticulata (Mandarin) + C. maxima (Pomelo) as the female parent.  Mandarin can be called Citrus reticulata var. mandarina and Tangerine can be called Citrus reticulata var. tangerina.  Mandarin has also been called var. deliciosa and of course it has other names as well.

            The ‘x’ in the middle of any Latin binomial simply means that the plant is a cross, probably infertile as well,  and in the case of ‘Bitter Orange’, several types of Citrus were crossed to obtain this plant.   There are many backcrosses in this group of Bitter Orange/Neroli.

             There is a naming problem in citrus, and it is complicated by the number of edible citrus that are recognized plus the many crosses, back-crosses, rootstock clones,  hybrids, species, subspecies and varieties. “The taxonomy of the citrus fruits is complicated by hybridity and apomixis (asexual reproduction in plants), with many stable hybrid lines being accorded species status, so that the number of edible species recognized in the genus Citrus L. … varies from 1 to 162”.¹  Anywhere from 12 up to 162 different ones are accorded subspecies or varietal names. 

Some Citrus Parentage

∞

CITRUS COUNTRIES OF ORIGINS AND HISTORY ~ There is a wide range of study of where and how the diverse group of Citrus developed or are indigenous. They are now naturalized worldwide. For instance, Guenther mentions that Lime is probably a native of the East Indian Archipelago and then brought to the Asiatic mainland and on to tropical and subtropical regions of the world. Lime was brought to Europe by the Arabs. Citron, with a primary lineage, was called ‘the fruit of Persia’ and in 327 BC, Alexander the Great defeated this area and the Greeks found Citron there under cultivation. For more extensive information on country of origin of citrus,  read volume 3, of The Essential Oils by Guenther OR “Citrus edited by Giovanni Dugo and Angelo Giacomo, 2002”.

•

CITRUS ENDANGERED OR NOT ~ There are so many kinds of citrus in so many parts of the world that at this time the citrus fruits, juices, cold-pressed peel oil and EO are not endangered.

•

CITRUS GENERAL DESCRIPTION OF PLANT HABITAT AND GROWTH ~ Citrus is grown in tropical and subtropical areas, including various southern areas in the southern USA. They are found in sunny, warm areas throughout the world.  The tree is a small evergreen tree, somewhat cold-hardy and tolerant of drought.

•

CITRUS. Portion of plant used in distillation, how distilled, extraction methods and yields ~ The leaf, flower, peel of various citrus are either cold-pressed (CP) or steam-distilled (SD) depending on the type of scent you wish.  Lime peel and other citrus peels is not phototoxic when SD but is when CP. Yields are listed in the original articles on this blog.

•

CITRUS CHEMISTRY

            Here is probably where you want to review volume III of Guenther’s The Essential Oils because here is where you will find 359 pages discussing each of the citrus oils and the equipment used to cold-press or steam-distill them as well as their production, and various areas where these citrus oils are grown and individual articles on chemistry and background.

THE STORY OF LIMONENE ~ Chemical Components ~ Limonene

            Limonene Story was edited by Hubert Marceau who is at www.phytochemia.com

“Limonene, a compound of the terpene family, is present in the distilled essential oil and in the cold-pressed oil of citrus peel [NOTE: if you are talking about the seed oils, that is something else.] But limonene is present in the cold pressed oil from the rind and in the distilled essential oil.”

            There are two isomers of limonene. Each have at least 30 different names. They are most easily identified by the R or S type. 4(R)-limonene ) (+)-Limonene) and 4(S)-limonene. Alternative prefixes to label optical isomers include ‘ d ’ and ‘l’ and more commonly the symbols + and – are used.

            “The limonene structure has a chiral center, and thus it can be found in nature as one of the two enantiomers mentioned above, the (R)- and (S)-limonene. The R isomer has the characteristic sweet smell of oranges while the S isomer has a more smell like a piney turpentine.”

            D-limonene ((+)-limonene), which is the (R)-enantiomer d-limonene is (+)-Limonene and D-LIMONENE is a colorless, clear, mobile liquid with a pleasant sweet odor as in mandarin & orange.  There is the L-LIMONENE, (-)-Limonene, S)-(−)-Limonene or sinistral or left enantiomer. Lime and lemon is (S)- smells like the sour of lemons.

•

•

CITRUS VARIETIES NOT YET DISCUSSED

BUDDHA HAND CITRUS ~ C. medica var. sarcodactylus. The fingered Buddha’s hand,  is a bizarre looking citrus, an elongated fruit about 6 inches long with many vertical indentations on the peel that make this yellow-colored fruit look like a hand. It has a thick peel used to flavor distillates, liquors or the peel is candied and used in cooking and in various baked goods. It is wonderful infused in vodka to make a delicious base for a cocktail. This citrus can also be chopped and infused in neutral grape or orange spirits (https://organicalcohol.com/) and used as a citrus fixative in perfumery or in citrus accords or as a diluent for fine perfumes. The fruit is also used fresh or dried in clothing closets to fragrance clothing or stored items. (if used fresh it must be removed after a week or two or it will mold). This fruit is mostly peel and is candied and eaten or used to flavor vodka and other high alcohol beverages.

It is an ornamental tree in the garden, the fruit contains no pulp and no juice, and the zest is used in desserts, or candied as a sweet. Possession of the fruit or a tree “is believed to bring good health and to symbolize wealth. The Chinese character for “hand” (shou) sounds like that for “longevity” and so the two are associated. In resembling the classic prayer position of Buddha’s hand, the long fruit fingers connote Buddhism.”.

•

CITRON or ETROG ~ Citrus medica, one of the five pure citrus species, male parent with female Bitter Orange to produce the Lemon, is also called ‘Etrog,’ or cedrat and used on certain Jewish holidays. There are also specific names based on its various shapes. An etrog is a citron that looks mostly like a misshapen lemon but smells delicious; it is a fragrant citrus fruit, consists of a dry pulp and only a small quantity of juice.  The branches and fruit are waved each day on Sukkot, except on Shabbat, in a specific manner for a variety of reasons. I do not know much about the Citron except that it is important on Jewish holidays and based from ancient studies, the citron was used mainly for medicinal purposes. It was greatly used to fight seasickness, intestinal problems, pulmonary illnesses, and other illness.

            I use the Citron by taking the most fragrant part of the outer peel (flavedo or exocarp) and removing any unscented part of the albedo (white part), place in jar and cover with 95% neutral grape spirits.  I imagine you could also use the 95% neutral orange spirits for a stronger odor. After a few weeks, I strain out the alcohol and either add more peel or just label the container and use it as part of the diluent of a perfume.

•

KUMQUAT ~ Citrus japonica. This is a small fruit-bearing tree with a small large olive-shaped fruit that can be eaten when ripe, peel and all. They are native to south Asia and were introduced to Europe about 1846 by Robert Fortune. The originally given Latin name was Fortunella japonica. I am not familiar with the essential oil, but Wikipedia says, “The essential oil of the kumquat peel contains much of the aroma of the fruit and is composed principally of limonene which makes up around 93% of the total.  Besides limonene and alpha-pinene (0.34%), both of which are considered monoterpenes, the oil is unusually rich (0.38% total) in sesquiterpenes such as a-bergamotene (0.21%), caryophyllene 0.18%),  (bergamotene α-humulene (0.07%) and α-muurolene (0.06%), and these contribute to the spicy and woody flavor of the fruit.”

•

LEMONADE TREE ~ The correct name is Citrus x limon unless it is a Mandarin or tangerine and then would be Citrus reticulata. Of course, it also could be (Citrus limon x reticulata) and this is a cross between a lemon tree and a mandarin tree that was developed in Australia but was first found in New Zealand in the 1980s. The fruit is sweet like a Mandarin but with a citrusy lemon bite like a Lemon. You can pick and eat the fruit off the tree like an Orange.

•

LIMETTA ~ Citrus limetta, alternatively considered to be a cultivar of Citrus limon, C. limon ‘Limetta’, is a species of citrus, commonly known as mousambi, musambi, sweet lime, sweet lemon, and sweet limetta, it is a member of the sweet lemons.⁵ It is a cross between the citron and a bitter Orange. In France, this variety is known as ‘a Mamelon’ that describes the nipple shape of the end of the fruit. The juice and  peel are both  used.   A sweet lemon is not an oxymoron. Neither is it a new fancy hybrid. Persian limu shirin, Citrus limetta, is one of the oldest cultivated varieties of lemons and it tastes sweet like honey, with no hint of acidity. “The first time I bit into a slice was a shock, because I was prepared for tartness and instead my mouth was filled with sweetness.  Even more beautiful was the scent of the peel that lingered on my fingers. It also smelled like no lemon I had tried before.”   This is a lovely quote from January 28, 2019 by Victoria, “…The best way to enjoy sweet lemons is to make a glass of juice and drink it over ice. No sugar or any other flavorings are needed. The juice has the interesting property of turning pleasantly bitter as it oxidizes, becoming reminiscent of sweetened grapefruit juice. In France, this variety is known as ‘a Mamelon’ that aptly describes the shape of the end of the fruit. Juice & peel used ….” —January 28,2019, Essays on Flavor and Fragrance, Food & Fragrance, Perfume 101.

•

POMELO ~ Citrus maxima or pamplemousse. This is another large original form of citrus that is eaten and in Vietnam, the peel is steam-distilled for the oil. When I wrote the blogpost on Grapefruit in February 2019, I only briefly mentioned the Pomelo.  I was written too by (Yen Ta) and she mentioned that I had not said much about Pomelo.  I knew of it and had seen the fruit in the market but had never experienced the oil. In August, I received this bottle of steam distilled EO from Vietnam via Yen Ta and am now able to discuss it. Pomelo peel SD is colorless, clear, non-viscous, of low intensity, and bitter aromatic taste.  Its odor is very mildly citrus, with herbaceous afternotes.  I have used it in a citrus accord as well as making some bases with it for perfumery purposes.

            Pomelo rind is used to control coughs and as an expectorant. Pomelo peel extract has also been studied in mice to prevent high-fat diet-induced metabolic disorders. Since it is related to Grapefruit as one of Grapefruits primary parents, it shares common  furanocoumarins (because of the potential for furanocoumarins to increase the bloodstream concentration of a drug to higher than expected, it can lead to unfortunate consequences), and thus should not be taken with heart medications. Steam-distilled Pomelo peel when used externally does not cause sun toxicity.

            White fleshed Pomelo is milder in acidity than the red-fleshed. Pomelo when analyzed by GCMS has been found to contain up to 62% d-limonene, anethol to 9.5% and nootketone to 5.6%. Supercritical CO₂ extraction has been done on Pomelo flower and analyzed and Pomelo CO₂ can be  used in perfumery and other uses now being examined.

•

YUZU ~ Citrus junos Sieb ex Tanaka – it is well-known and very popular in Japan and Korea and has been in use for about 1000 years.  It is used in the cuisine of Japan and in cosmetics. I have had the opportunity to taste it here (San Francisco) at various restaurants in salad dressings and in desserts. However, for people taking certain medications, one should limit their ingestion of this food.

            There are many cultivars of this plant and the essential oils from the peel have been examined for at least six of the cultivars. These are acidic citrus from China that are often grown as (strong, resistant) rootstock for other citrus varieties and for its fruit. The fruits are acidic and moderately juicy with a very pleasant citrus aroma and can be used as a lemon substitute. The peel is strongly citrus and pleasantly scented and makes a good addition to blends and in perfumery. If making a Citrus scent, adding 5% of Yuzu to a base note increases the sweet-tart scent of the entire perfume. The scent is very refreshing.

•

CITRUS OIL – ORGANOLEPTIC CHARACTERISTICS

ODOR DESCRIPTION/ AROMA ASSESSMENT ~ Citrus Notes ~ Citrus oils are used in the perfumery business to impart a fresh, sparkling note to any blend.  They are usually not overpowering.  They can be used in up to 25% as the base scent for classic type of eau de cologne.  Citrus oils harmonize with many other essential oils and they are used in different concentrations in almost all scent blends and modern perfumes.   >In combination with Lavender oil, citrus oils are the base for English Lavender which  is an 1826 creation.  High concentrations of citrus oils are in Chanel No. 5 (1921).  Also, of importance are the citrus oils in pop drinks like Coca-Cola and others.

§

GENERAL PROPERTIES

Properties and Uses~ Some of the citrus oils are relaxing and most are very enlivening. They are calming but do not cause lethargy or fatigue. In general, these oils are slightly antiseptic, ease gut spasm (antispasmodic), can be slight diuretics, purifying (depurative), ease stomach aches, cholagogue (promotes the discharge of bile); and when inhaled can be calming but not exhausting; and in skin care or by external application in products have antiseptic properties.

Physical Uses & How Used ~  
Application (AP) – Citrus oils go nicely into many blends that are used for skincare. It would be a top note or heart note to other aromatic oils  in natural perfumery and  blends well with many. In lotions and creams, they have a slight antiseptic quality as well as the aromatic livening scent.

Ingestion (IG) –   Do not drink the essential oils. Drink the juice instead or dry and keep the peels for your bath and potpourri.Inhalation (IN) – Citrus oils are generally relaxing but not tiring by inhalation , especially when mixed with some of your other favorites such as Lavender, Spikenard, Jasmine, and many more.

•

SKIN CARE FORMULAS are available in my 350-page  Herbal Body Book that is chock-full of great skin, hair, and body care formulas. Here is one I have always enjoyed. They can add nuance to any blend or perfume.

•

A CITRUS MASK BY JEANNE ROSE

The San Clemente Citrus Mask. Peel a small orange, a small Lemon, or other citrus, and mash the pulp, or else put the pulp into a blender and blend. Add enough yellow Corneal to make gritty. Apply to your clean slightly moistened face or body. Let the mask stay for a few minutes.  If you have collected the juices separately, add them to steaming water and steam your face for a minute. Roll of the gritty citrus meal with your  fingers for a gentle exfoliation. Rinse off the mask with tepid water or take a shower and rinse off the mask or use the gritty Citrus/Cornmeal as a scrub to also exfoliate your legs and arms. Dry and apply a citrus hydrosol spray to finish.

           There are many ways to use this mask and it will leave your skin very fresh and clean. Use it when you are fatigued and to prevent aging. The San Clemente Mask reminded my husband of hot supermarkets and parking lots; so, when your feet are hot and your eyeballs feel like they are falling out of your face from the heat, apply the San Clemente Orange and you will feel better. [see p. 190 of for more].

           The San Clemente Mask reminded my husband of hot supermarkets and parking lots; so, when your feet are hot and your eyeballs feel like they are falling out of your face from the heat, apply the San Clemente Orange and you will feel better . [see p. 190 of 350-page for more]

• • •

Diffuse/Diffusion ~ You can pretty much mix and match your citrus oils any way you wish with other Mediterranean type oils or florals.  Pick the effect and choose your oil.  Look at the citrus blogposts already posted for many uses and blends. I have already written about Bergamot, Grapefruit, Lemon, Lime, Mandarin, Tangerine, Orange, Bitter Orange, Neroli and Petitgrain.

•

Emotional/Energetic Uses (AP or IN) ~ Inhale the citrus oils to combat apathy, to stimulate appetite, to increase creativity, to improve mood, to give joy, to refresh your life. Remember them when you are depressed, exhausted and need emotional healing.  All the citrus oils have a joyful sunny quality to them.

∞

FORMULA for Physical Use by Inhalation ~ Get your oils and using Lavender, Lemon, and YlangYlang, it was found that this aromatherapy oil combination is effective in lowering systolic blood pressure and sympathetic nerve system activity. The blend was 2-2-1 and you can read about it here. http://www.ncbi.nlm.nih.gov/pubmed/21157172

∞

BLENDING & PERFUMERY  ~ Blending with citrus oils is very easy. It is almost impossible to make a mistake. Know what you want to do, pick the correct citrus for the effect and then make a few samples to scent and try. Mix with Rosemary, Vetivert, Cloves, Caraway; or herbs, roots, flower buds and seeds. Use the charts in Chapter 1 of and The Aromatherapy Book, Applications & Inhalations to make your selection of the oil and the application.

EAU DE COLOGNE

The best is made with a variety of citrus scents with added Rosemary. There are many ways to make this cologne. George W. Askinson, Dr. of Chem. in 1865, said, “Cologne water of the most superior and incomparable quality is made by dissolving the essential oils in the alcohols and then distilling it, then adding the Rosemary and Neroli to the distillate. Dissolve the aromatics in 95% neutral grape spirits — distill — add the Neroli and the Rosemary.”  Effect the dilution required with Orange flower water or Rose water. Ultimately, Eau de cologne is 75% fragrant alcohol and 25% water or flower water.

            Here is one recipe, and Orange spirits can be substituted at the end for some of the Grape spirits. You can adjust the ingredients up and down as you see fit.

1 quart (85-95%) Grape spirits (substitute some orange Spirits for some of the grape)
4 ml Orange peel CP
2 ml Bergamot peel CP
½ ml  Bitter Orange CP
½ ml  Neroli petal EO
2 ml  Rosemary EO
           You can also make it of Corn spirit which has a distinct aroma difference from the grape spirit. I use OrganicAlcohol.com

The difference between eau de Cologne made in France or made in England is the difference in the spirit used and results in a completely different odor. Fine perfumes should only be made with freshly distilled 70-95% neutral grape spirits. 

            All the older perfumes were diluted down with neutral grape spirits. Originally, they were considered medicines and were taken internally by the drop. After the introduction of synthetics, around 1850, perfumes were made with chemicalized ingredients and were no longer edible.  However, even today certain uplifting ‘spirits’ are sold in Europe as a tonic against seasickness, carsickness and all sorts of nausea.

            “The original eau de cologne was invented in 1709 by a man named Farina who was homesick for his home country of  Italy. He described the scent and said it reminded him of a spring morning with mountain daffodils and the orange blossoms after a rain.” ⁷

•

HYDROSOL ~ I truly love all of the citrus hydrosols. I use them for everything. I found that a well-distilled Lemon peel hydrosol was great for itchy eyes as a wash. I have used Neroli hydrosol as a perfume, Orange hydrosol to spray my house at Christmas and so many other uses. Read the individual blogposts for using the citrus hydrosol. My favorite places to purchase citrus hydrosols is from people who live where the citrus grow and that includes LancasterCreations.com as they are an organic apothecary and community in the growing heart of California and near the ancient Sequoias of the Sierras.

•

CITRUS LEAF DISTILLATE TOMATO TALE

In September 2019, the citrus leaves arrived. I opened them, examined the leaves and noticed they were covered with dust; the leaves were absolutely covered with whatever comes out of the sky. So, I carefully washed and cleaned every one of them by hand. Then had a good whiff and enjoyed the odor. If you want Petitgrain hydrosol you will have to get leaves ONLY from an area that is out of the pollution and somewhere where the air is clean, and the citrus is organically grown.

            The only other time I have ever seen leaves so dirty and musty like this is when I was taken to an abandoned Orange grove in Los Angeles that was at the center of a confluence of interstate freeways and in the smog — my Distillation class and I picked leaves individually, washed, wiped, dried, cleaned each one before we did the distillation. When we were done, we passed the hydrosol around just for the smelling but then poured it away, back onto the ground under the trees.  I know there are organic farms in the California foothills, such as the Olsen Farm, where you could pick organically grown citrus leaves that are not encrusted with pollutants.  I worry about people and their children that are inhaling these pollutants every day.  I hope that people think about this and take some sort of protective herbs for lungs and on the skin and do not pick and use any plant product that is not organically grown and sustainable.

PLEASE NOTE: A true hydrosol should be specifically distilled for the hydrosol, not as a co-product or even a by-product of essential oil distillation. The plant’s cellular water has many components most are lost under pressurized short steam runs for essential oil, or by using dried material. We recommend that the producers specifically distill for a product by using plant material that is fresh

•

CITRUS INTERESTING INFORMATION ~

THE KEEPING QUALITIES OF CITRUS OILS

“Lemon and Orange oils even improve after a year or two of cold storage  in that some of the dissolved waxes separate from the oil and may be removed easily by filtration. The resulting oils are more soluble and produce clearer extracts. Neither odor nor flavor is impaired if the oils are kept in tin-lined fully filled drums.”⁶

•

ABSTRACT/SCIENTIFIC DATA: Antifungal activity of natural and modified flavonoids isolated from citrus species. By Salas, et al. … Abstract. The antifungal activity of  isolated flavonoids from Citrus species, such as naringin, hesperidin and neohesperidin, and enzymatically modified derivatives of these compounds, was studied on four fungi often found as food contaminants: Aspergillus parasiticus, A. flavus, Fusarium semitectum and Penicillium expansum.  Although all the flavonoids showed antifungal activity, the intensity of this activity depended on the type of fungus and compound used. The hesperetin glucoside laurate strongly inhibited the mycelial growth of P. expansum, while prunin decanoate was the most inhibiting flavonoid for A. flavus, A. parasiticus, and F. semitectum.   The flavonoids naringin, hesperidin and neohesperidin, obtained as byproducts at low cost from the residues of the citrus industries, present an interesting option for these industries. — Food Chemistry, Vol. 124, issue 4, 15 February 2011, pages 1411-1415.

•

KEY USE ~ Citrus peels, leaves, flowers are used for scent and the flesh is used for food and ritual.

•

Citrus Limerick (2019)
Citrus fruit is delicious to eat
The taste is fine and cannot be beat.
Bright and sunny
Just like honey
Citrus fruit is better than meat.

CITRUS TOMATO TALE FROM 1961-1963

            Years ago, in 1961-1963, I lived in the middle of an Orange grove, in a sweet white farm-style house with high ceilings and ceiling  fans, lots of windows where the breezes could blow through with the scent of oranges and citrus flowers. I  lived there with my husband and my blue Great Dane dog George. George later became an important figure in my rock and roll world and was eventually photographed for the cover of an album as well as the centerpiece of a photograph that included fashion I had designed and the models wearing them including Janis Joplin.  But our lives started here in the middle of a fragrant orange grove. 

            I had a big square white bedroom with a ceiling fan and right outside the bedroom window was a large citrus tree that had had grafted onto its trunk various varieties of citrus. This tree depending upon the season was an orange tree, lime tree, lemon tree, grapefruit tree or  one other variety that I have forgotten. Part of it was always in bloom, and it always scented up the dark humid Florida nights. Those were the days of no cell phones, little to no TV, and those quiet dark nights amongst the trees and the divine scent of citrus flowers.  Eating fresh citrus every day and smelling those luscious flowers in the evening was the best part of my time living in Florida. I wonder if the sweet scent still lingers and  the quiet can still be found there in the night.

            Eventually, George and I, jumped into my red Comet station wagon with all our belongings and made a 6-week rambling journey across the  United States to come home to California and start the next phase of life in Big Sur, CA.

•

•

References ~
¹  A classification for edible Citrus (Rutaceae) D.J. Mabberley, unknown date
² https://www.popoptiq.com/types-of-lemons/
³ Mabberley, D. J. Mabberley’s Plant-Book, 3^rd edition, 2014 printing, Cambridge University Press.
⁴ Employment of a new strategy for identification of lemon (Citrus limon L.) cultivars using RAPD markers. Q Mu, X Sun, G Zhong, X Wang… – African Journal, 2012 – academicjournals.org
⁵ Pharmacogn Rev. 2016 Jul-Dec; 10(20): 118–122.doi: 10.4103/0973-7847.194043. Anticancer Activity of Key Lime, Citrus aurantifolia by Nithithep Narang and Wannee Jiraungkoorskul
⁶Guenther, Ernest. The Essential Oils. Volume III.Krieger. 1974
⁷ http://www.cologneboutique.com/the-history-behind-eau-de-cologne/

Herbal Studies Course/ Jeanne Rose & Berkeley, California: North Atlantic Books, 1992
https://commons.wikimedia.org/wiki/File:Citrus_hybrids.svg

Pomelo essential oil provided by tahaiyen@gmail.com
Rose, Jeanne.  375 Essential Oils and Hydrosols.  Berkeley, California: Frog, Ltd., 1999
Rose, Jeanne.  The Aromatherapy Book: Applications & Inhalations.  San Francisco, CA.
Rose, Jeanne. , San Francisco, CA 2000 from 1976. The best and most complete.
Rose, Jeanne. Kitchen Cosmetics. San Francisco, CA.

•

•