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2000 species in 150 genera are found in tropical and subtropical regions. Litchi chinensis furnishes edible fruit (litchi).
Acer palmatum Thunb. and other species are often planted as ornamental trees and shrubs. They are also popular as subjects for bonsai, a natural art form produced by artificially stunting the growth of the specimen.
Many species of Acer yield good timber. Acer saccharum Marshall and other species in eastern North America yield maple syrup.
The pollens of the anemophilous species, less commonly the amphiphilous and entomophilous species, are minor causes of pollinosis (Wodehouse 1971). Inhalation of fungal particles from maple bark (Acer L. spp.) can cause maple bark disease, a form of allergic alveolitis (Seaton & Morgan 1984).
[Summary yet to be added]
- Aesculus hippocastanum L.
- (syn. Hippocastanum vulgare Gaertn.)
- Horse Chestnut, Oblionker Tree
A particle of the shell of the horse chestnut became embedded in the conjunctiva and caused necrosis and ulceration by a local toxic effect (Grant 1974).
- Aesculus octandra Marshall
- Yellow Buckeye
The flowers and young shoots of some species, especially Aesculus octandra, are said to be capable of causing contact dermatitis (Massey 1941).
- Acer L.
Species of Acer L., Tilia L. (fam. Tiliaceae), and certain other deciduous trees may become heavily infested with aphids living on the undersides of the leaves. Whilst feeding, these insects excrete a sugary liquid known as honeydew which falls from the trees as a fine rain. Large numbers of aphids may also fall from the trees. A case has been described where an elderly woman with suspected delusions of parasitosis (Ekbom's syndrome) who, after unknowingly sitting under a species of Acer during the summer months, complained of a sticky feeling and a crawling sensation caused by green insects on her skin (Mitchell 1975).
Maple is said to be a sensitising wood by Weber (1953), repeated by McCord (1958).
- Acer macrophyllum Pursh
- Big-Leaf Maple, Oregon Maple
The fruits (maple keys) are covered with spiny hairs that can penetrate and irritate the skin (Hebda 2003).
- Acer negundo L.
- (syn. Negundo aceroides Moench)
- Box Elder Maple
The pollen of this and another species of maple has been implicated as a cause of airborne contact dermatitis by Lovell et al. (1955) who observed positive patch test reactions to "box elder pollen oil" and to "maple pollen oil" in two patients.
- Acer nikoense Maxim.
- (syns Acer maximowiczianum Miq., Crula nikoense Nieuwl., Negundo nikoense Miq.)
- Nikko Maple
4-(4-Hydroxyphenyl)-2-butanol, an arylbutanoid known as 4HPB, rhododenol, or more correctly, rhododendrol, is found naturally in this species (Das et al. 1993). This substance inhibits tyrosinase in the skin and therefore can cause leukoderma and vitiligo-like symptoms (Kasamatsu et al. 2014, Sasaki et al. 2014, Nishigori et al. 2015). Both R-(–) and S-(+) enantiomers of rhododendrol exhibit this activity (Ito et al. 2014). Rhododendrol [CAS RN 69617-84-1]a has been included in proprietary skin-lightening products, but these have been withdrawn from the market, and users advised against their use following reports of the appearance of white blotches on the skin of users.
Rhododendrol is also found in certain species of Rhododendron L., fam. Ericaceae (Archangelsky 1901, Das et al. 1993) and Betula L., fam. Betulaceae (Santamour & Vettel 1978, Santamour & Lundgren 1997).
- Acer pictum Thunb.
Nadkarni (1976) states that the leaves of this species are irritant.
- Acer platanoides L.
- Norway Maple
The wood was listed as irritant by Hanslian & Kadlec (1966), probably from Weber (1953).
- Acer rubrum L.
- Red Maple, Swamp Maple
An extract of the bark has been used for its astringent effect in the treatment of sore eyes by North American Indians (Wren 1975).
- Acer saccharum Marshall
- Sugar Maple
This species has been found to contain 2,6-dimethoxy-1,4-benzoquinone, a known contact allergen (Hausen 1978a).
- Cardiospermum halicacabum L.
- (syns Cardiospermum corindum L., Cardiospermum luridum Blume, Cardiospermum microcarpum Kunth, Cardiospermum molle Kunth, etc.)
- Blister Creeper, Balloon Vine
The leaves is irritant and are used for rubefacient purposes (Quisumbing 1951, Gardner & Bennetts 1956, Watt & Breyer-Brandwijk 1962, Behl et al. 1966). Gardner & Bennetts (1956) also note that the root has been used in the treatment of haemorrhoids, probably from Webb (1948a).
- Deinbollia oblongifolia Radlk.
- (syns Sapindus oblongifolius Sond., Rhus oblongifolia E.Mey. ex Arn.)
- Dune Soapberry
A foam is produced by shaking the berries from Sapindus oblongifolius with water (Watt & Breyer-Brandwijk 1962).
- Hippobromus pauciflorus Radlk.
- (syns Hippobromus alata Eckl. & Zeyh., Rhus alatum Thunb.)
A decoction of the plant is used in southern Africa as a sternutatory. Frothing of the roots, when mixed with water, may indicate the presence of saponins (Watt & Breyer-Brandwijk 1962).
The genus is monotypic.
- Melicoccus bijugatus Jacq.
- (syns Melicoccus bijuga L., Melicoccus carpopodea Juss., Paullinia sphaerocarpa Rich. ex Juss.)
- Genipe, Honey-Berry, Mamoncillo, Spanish Lime
This species which provides timber and edible fruit was reported to cause contact dermatitis by Pardo Costello & Reaud (1941).
- Paullinia cupana Kunth
- (syn. Paullinia sorbilis Mart.)
The fruit of this climbing shrub provides an edible seed rich in caffeine. It was formerly officinal (Remington et al. 1918, Todd 1967).
Piffard (1881), citing an earlier report by Montegazza, noted that ingestion of guarana [seed?] has been reported to cause urticaria and pruritus.
Paullinia Cupana Fruit Extract / Fruit Powder / Seed Extract / Seed Powder / & Seed Water [INCI; CAS RN 84929-28-2]a, are recognised cosmetic product ingredients variously purported to have skin conditioning, astringent, tonic, and/or emollient properties, as is also Caffeine [INCI; CAS RN 58-08-2; masking & skin conditioning] (Standing Committee on Cosmetic Products 2019, CosIng 2021). According to Baumann (2007), caffeine is well known to cause dehydration of fat cells, temporarily improving the appearance of cellulite and is a common additive to cellulite treatment products.
Koo et al. (2007) reported that topical application of caffeine after UV exposure decreases UV-induced skin roughness and transverse rhytids in SKH-1 hairless mice.
- Paullinia pinnata L.
- (syns Paullinia angusta N.E.Br., Paullinia hostmannii Steud., Paullinia pendulifolia Rusby)
- Bejuco de Costillo, Sweet Gum, Paullinie
The root and root bark are applied for rubefacient purposes (Watt & Breyer-Brandwijk 1962).
- Sapindus saponaria var drummondii L.D.Benson
- (syn. Sapindus drummondii Hook. & Arn.)
- Jaboncillo, Western Soapberry
Dermatitis can result from handling of the fruits (Schwartz et al. 1957).
- Sapindus saponaria L. var saponaria
- (syns Sapindus divaricatus Cambess., Sapindus inaequalis DC., Sapindus mukorossi Gaertn., Sapindus peruvianus Walp., etc.)
- False Dogwood, Jaboncillo, Soap-Nut Tree, Southern Soapberry, Wingleaf Soap Berry
The berries form a lather with water and may be used as soap. They contain saponins that may cause a severe skin rash in sensitive individuals (Allen 1943, Blohm 1962, Morton 1962a). Behl et al. (1966) similarly noted that the pulp of the fruit of Sapindus mukorossi forms a lather with water and may be used as a shampoo.
The juice of the fruits of Sapindus mukorossi is used for removing freckles (Smith 1969).
- Schleichera oleosa Oken
- (syns Pistacia oleosa Lour., Schleichera trijuga Willd.)
- Kussum, Paka, Ceylon Oak, Zeepboom
Shellac is a resinous excretion of an insect which sucks the juices of this and other trees (Hicks 1961). This tree yields Mirzapore lac and also, useful timber, edible seed and seed oil. Macassar oil (kusum oil) is derived from the seed kernels (Budavari 1996). Macassar oil is also a name for ylang-ylang oil from Cananga. Macassar oil may contain additives such as safflower oil from Carthamus tinctorius L., (fam. Compositae). Harry (1948) referred to two papers concerning dermatitis or allergy from the oil but considered it innocuous. Shellac is said to have irritant or sensitising properties (Greenberg and Lester 1954) and has been removed from certain brand-name cosmetics (Anon 1973). Hausen (1970) refers to Wehmer (1929) and Anon (1940) for injurious effects of the plant products. The oil of macassar wood, possibly of this species, caused dermatitis in a planer (Buschke and Joseph 1927). Shellac is noted under Acer.
The genus is monotypic.
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