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Picrasma excelsa - (Sw.) Planch.

Common Name Jamaican Quassia
Family Simaroubaceae
USDA hardiness 10-12
Known Hazards Some care needs to be exercised when ingesting this plant since excess doses can lead to gastric irritation and vomiting[254 ].
Habitats Hill pastures, relict woodland and along the sides of roads at elevations from 90 - 825 metres[426 ]. Tropical forests and near water[254 ].
Range Northern S. America to Central America and the Caribbean.
Edibility Rating    (2 of 5)
Other Uses    (4 of 5)
Weed Potential No
Medicinal Rating    (4 of 5)
Care (info)
Tender Moist Soil Full sun
Picrasma excelsa Jamaican Quassia

Picrasma excelsa Jamaican Quassia


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A tropical plant growing up to 25 m in height, Picrasma excelsa or commonly known as Jamaican Quassia can be found in Northern South America to Central America and the Caribbean. It is primarily cultivated for medicinal uses. The bark is used to reduce fever, improve appetite and digestion. It is also used against malaria and anorexia. Externally, it is used against lice, threadworms, and other parasites. Extract from the bark is also used as flavoring in food and drinks. Another use of the bark is for insect control for it has insecticide properties. The wood of Jamaican Quassia is soft, light, and easily split.

Physical Characteristics

 icon of manicon of lolypop
Picrasma excelsa is a deciduous Tree growing to 20 m (65ft) by 15 m (49ft) at a medium rate.
See above for USDA hardiness. It is hardy to UK zone 10.
Suitable for: light (sandy) and medium (loamy) soils and prefers well-drained soil. Suitable pH: mildly acid, neutral and basic (mildly alkaline) soils. It cannot grow in the shade. It prefers moist soil.

UK Hardiness Map US Hardiness Map


Picraena excelsa (Sw.) Lindl. Quassia excelsa Sw.

Plant Habitats

Edible Uses

Edible Parts: Inner bark
Edible Uses:

The bitter extract of the bark is used as a flavouring in drinks, baked goods, candy etc[238 , 301 ].

References   More on Edible Uses

Medicinal Uses

Plants For A Future can not take any responsibility for any adverse effects from the use of plants. Always seek advice from a professional before using a plant medicinally.
Appetizer  Bitter  Febrifuge  Malaria  Parasiticide

Jamaican quassia bark contains several medically active constituents including quassinoid bitter principles (including quassin); alkaloids; a coumarin, scopoletin; and vitamin B1[254 ]. It is an intensely bitter, non-astringent, odourless herb that lowers fever, stimulates appetite and improves digestion[238 ]. It is an effective parasiticide and is reputedly antileukaemic[238 ]. Some of the quassinoids have been shown to have cytotoxic and antileukaemic actions[254 ]. The strongly bitter principle in the bark supports and strengthens weak digestive systems, increasing bile flow plus the secretion of salivary juices and stomach acids[254 ]. It is used internally in the treatment of a wide range of illnesses where digestion is a contributory factor, particularly convalescent debility, poor appetite and anorexia[238 , 254 ]. Its bitterness has led to it being used in the treatment of malaria and other fevers[238 , 254 ]. It is also used to rid the body of nematode worms[238 ]. Used externally, it is a good lotion to get rid of parasites such as lice[238 ]. It is also used in an enema to rid the body of threadworms and other parasites[238 , 254 ]. The bark can be harvested as required throughout the year, and can be dried for later use[254 ].

References   More on Medicinal Uses

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Other Uses

Insecticide  Parasiticide  Repellent

Other Uses: The decocted bark is an effective insecticide against flies, red spider mites, aphids and woolly aphids[238 ]. It is used as an insect repellent[254 ]. The white to yellowish-white wood is soft, light, loosely grained, easily split[46 ].

Special Uses

References   More on Other Uses

Cultivation details

Prefers a fertile, humus-rich, moisture-retentive sandy loam[238 ].

References   Carbon Farming Information and Carbon Sequestration Information

Temperature Converter

Type a value in the Celsius field to convert the value to Fahrenheit:



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Plant Propagation

Seed - best sown as soon as it is ripe. Semi-ripe cuttings.

Other Names

If available other names are mentioned here

bitter wood, bitter-ash, bitterved, bitterwood, bois noyer, jamaica quassia, jamaica quassiawood, jamaika-bitterholz, peste à poux, quassia, quassia amara, quassia da jamaica, quassia de la jamaique, quassia de surinam, quassie, simaroube officinale, simaruba, simarubabaum, surinam quassia.

SOUTHERN AMERICA: Antigua and Barbuda (Antigua), Barbados, Cuba, Dominica, Dominican Republic, Guadeloupe, Haiti, Jamaica, St. Kitts and Nevis, St. Lucia, Montserrat, Martinique, United States (Puerto Rico, Virgin Islands, U.S.), St. Vincent and Grenadines (Saint Vincent), Virgin Islands (British) (Tortola), Costa Rica, Nicaragua, Venezuela

Weed Potential

Right plant wrong place. We are currently updating this section. Please note that a plant may be invasive in one area but may not in your area so it’s worth checking.

Conservation Status

IUCN Red List of Threatened Plants Status : Status: Vulnerable A1cd

Related Plants
Latin NameCommon NameHabitHeightHardinessGrowthSoilShadeMoistureEdibleMedicinalOther
Picrasma quassioidesNigakiTree10.0 5-9  LMHSNM123

Growth: S = slow M = medium F = fast. Soil: L = light (sandy) M = medium H = heavy (clay). pH: A = acid N = neutral B = basic (alkaline). Shade: F = full shade S = semi-shade N = no shade. Moisture: D = dry M = Moist We = wet Wa = water.


Expert comment


(Sw.) Planch.

Botanical References

Links / References

For a list of references used on this page please go here
A special thanks to Ken Fern for some of the information used on this page.

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