Mucuna pruriens (L.) DC., Fabaceae

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Present on Pacific Islands?  yes

Threat only at high elevations?  no

Risk assessment results:  High risk, score: 7 (Go to the risk assessment)

Other Latin names:  Dolichos pruriens L., Stizolobium pruriens (L.) Medicus., Stizolobium deeringianum Bort., Stizolobium aterrimum Piper and Tracey, Stizolobium niveum Kuntze.

Common name(s): [more details]

Chamorro: akangkang dangkulo

English: Bengal bean, cow itch, cowhage, itchweed, Mauritius bean, velvet bean

French: gratter, poil à gratter, pois pouilleux

Spanish: ojo de buey, ojo de venado

Habit:  vine

Description:  "Annual vine, grayish-pubescent; leaflets ovate to oblong, acute-acuminate, thin, pubescent-gray below, 5-13 cm long, the lateral leaflets asymmetrical; flowers purple, in drooping racemes of many flowers; each flower 3.5-4 cm long; calyx grayish-pubescent; pods stout, compressed, 5-10 cm long, 1.5 cm broad, densely pubescent, the brownish hairs easily detachable and highly irritating to skin; one longitudinal rib on each valve; seeds about 6 mm wide, compressed- ovoid, brownish with black mottling, hilum less than 3 mm long" (Stone, 1970; p. 338).

"Mucuna pruriens is an annual (or sometimes short-lived perennial), leguminous vine capable of growing to 6 m in length. The leaves are alternate with three large, rhomboid-ovate leaflets. The flowers are white to dark purple and hang in long racemes. M. pruriens produces clusters of pods that are curved (c. 4 to 8 cm long) and contain 2-6 seeds. The seeds vary in colour from black, white to mottled. The pods are covered with reddish-orange hairs that are readily dislodged and can cause intense irritation to the skin" (Michael, 1989, cited in Csurhes and Edwards, 1998; p. 180).

Habitat/ecology:  Moist tropics. "The plant can grow in a range of habitats and could become naturalised in grasslands, bushland, riverine forest and forest edges throughout tropical and subtropical regions" (Csurhes & Edwards, 1998; p. 180). In Fiji, "cultivated and sometimes sparingly naturalized at low elevations up to about 200 m" (Smith, 1985; pp. 210-211). "It can form woody thickets and smother underlying vegetation" (Smith, 2002; p. 94).

Propagation:  Seed

Native range:  India, now pan-tropical.

Presence:

Pacific
Country/Terr./St. & Island group	Location	Cited status & Cited as invasive & Cited as cultivated & Cited as aboriginal introduction?	Reference & Comments
Commonwealth of the Northern Mariana Islands (US) Northern Mariana Islands	Rota Island	introduced	Fosberg, F. R./Sachet, Marie-Hélène/Oliver, Royce (1979) (p. 118)
Commonwealth of the Northern Mariana Islands (US) Northern Mariana Islands	Rota Island	introduced invasive	Space, James C./Waterhouse, Barbara/Denslow, Julie S./Nelson, Duane (2000) (p. 21)
Commonwealth of the Northern Mariana Islands (US) Northern Mariana Islands	Saipan Island	introduced invasive	Space, James C./Falanruw, Marjorie (1999) (p. Field notes.)
Fiji Fiji Islands	Vanua Levu Island	introduced invasive cultivated	Smith, Albert C. (1985) (pp. 210-211) Mucuna pruriens subspecies pruriens var. utilis (Wight) Burck. Voucher cited: DA 16686 Sometimes sparingly naturalized.
Fiji Fiji Islands	Vanua Levu Island		Bishop Museum (Honolulu) (1969) (voucher ID: BISH 32844) Taxon name on voucher: Mucuna pruriens var. utilii (Wall. ex Wright) Bak. ex Burck
Fiji Fiji Islands	Vanua Levu Island		Bishop Museum (Honolulu) (1969) (voucher ID: BISH 32845) Taxon name on voucher: Mucuna pruriens var. utilii (Wall. ex Wright) Bak. ex Burck
French Polynesia Society Islands	Taha‘a Island	introduced cultivated	Welsh, S. L. (1998) (p. 156)
French Polynesia Society Islands	Tahiti Island	introduced cultivated	Welsh, S. L. (1998) (p. 156)
Guam Guam Island	Guam Island	introduced	Stone, Benjamin C. (1970) (p. 338) Present status unknown.
Guam Guam Island	Guam Island	introduced	Fosberg, F. R./Sachet, Marie-Hélène/Oliver, Royce (1979) (p. 118)
State of Hawaii Hawaiian Islands	O‘ahu Island	introduced cultivated	Imada, Clyde T./Staples, George W./Herbst, Derral R. (2006) (p. Voucher specimens) Var. utilis (Wright) Burck. Vouchers cited: Kopf s.n. (BISH 11037, BISH 666753, BISH 666754)
New Caledonia New Caledonia Archipelago	Île Grande Terre	introduced cultivated	MacKee, H. S. (1994) (p. 87) Forma utiis (Wall. ex Wight) Back.; vouchers cited: Pancher C 17 s.loc., Mieillard 2561, Mme. Leenhardt s.n., De la Chapelle in MacKee 41982
New Guinea (Indonesia and Papua New Guinea) New Guinea Island	New Guinea Island	introduced invasive	Waterhouse, B. M./Mitchell, A. A. (1998) (pp. 43-44)
Papua New Guinea Bismarck Archipelago	Bismarck Archipelago	native	ILDIS Co-ordinating Centre (2005)
Papua New Guinea Papua New Guinea (eastern New Guinea Island)	Papua New Guinea (eastern New Guinea Island)	native	U.S. Dept. Agr., Agr. Res. Serv. (2007)
Philippines Philippine Islands	Philippine Islands	native	ILDIS Co-ordinating Centre (2005)
Solomon Islands Solomon Islands	Solomon Islands	native	Hancock, I. R./Henderson, C. P. (1988) (p. 92)

Pacific Rim
Country/Terr./St. & Island group	Location	Cited status & Cited as invasive & Cited as cultivated & Cited as aboriginal introduction?	Reference & Comments
Australia Australia (continental)	Queensland	introduced cultivated	Csurhes, S./Edwards, R. (1998) (p. 180)
China China	China (People's Republic of)	introduced	ILDIS Co-ordinating Centre (2005)
Colombia Colombia	Colombia (Republic of)		Holm, Leroy/Pancho, Juan V./Herberger, James P./Plucknett, Donald L. (1979) (p. 241)
Costa Rica Costa Rica	Costa Rica (Republic of)	uncertain if native	ILDIS Co-ordinating Centre (2005)
Ecuador (Mainland) Ecuador	Ecuador (Republic of) (continental)		Holm, Leroy/Pancho, Juan V./Herberger, James P./Plucknett, Donald L. (1979) (p. 241)
El Salvador El Salvador	El Salvador (Republic of)	uncertain if native	ILDIS Co-ordinating Centre (2005)
Guatemala Guatemala	Guatemala (Republic of)	uncertain if native	ILDIS Co-ordinating Centre (2005)
Indonesia Indonesia	Indonesia (Republic of)	introduced invasive	Waterhouse, B. M./Mitchell, A. A. (1998) (pp. 43-44)
Japan Japan	Japan (country)	introduced	ILDIS Co-ordinating Centre (2005)
Mexico Mexico	Mexico (United Mexican States)	native	ILDIS Co-ordinating Centre (2005)
Panama Panama	Panama (Republic of)	uncertain if native	ILDIS Co-ordinating Centre (2005)
Taiwan Taiwan	Taiwan Island	native	ILDIS Co-ordinating Centre (2005)
Thailand Thailand	Thailand (Kingdom of)	introduced invasive	Waterhouse, B. M./Mitchell, A. A. (1998) (pp. 43-44)

Indian Ocean
Country/Terr./St. & Island group	Location	Cited status & Cited as invasive & Cited as cultivated & Cited as aboriginal introduction?	Reference & Comments
Australia (Indian Ocean offshore islands) Christmas Island Group	Christmas Island	introduced invasive	Waterhouse, B. M./Mitchell, A. A. (1998) (pp. 43-44)
Australia (Indian Ocean offshore islands) Christmas Island Group	Christmas Island	native	Orchard, Anthony E., ed. (1993) (p. 18)
Comoros Comoro Islands	Comoro Islands	introduced	ILDIS Co-ordinating Centre (2005)
La Réunion (France) La Réunion Island	La Réunion Island	introduced	ILDIS Co-ordinating Centre (2005)
Mauritius Mautitius Islands (Mauritius and Rodrigues)	Mauritius Island	introduced	ILDIS Co-ordinating Centre (2005)
Seychelles Seychelles Islands	Seychelles Islands	introduced	ILDIS Co-ordinating Centre (2005)

Comments:  Commonly used as a cover crop and the pods and beans are used to feed livestock. For information on the use of this and similar species in agriculture, see "Cover Crops in Hillside Agriculture: Farmer Innovation with Mucuna".

A weed species in Mexico, Mozambique, Jamaica and Madagascar (Waterhouse & Mitchell, 1998; pp. 43-44).

The utilis variety commonly used in agriculture lacks irritating hairs.

Additional information:  Additional online information about Mucuna pruriens is available from the Hawaiian Ecosystems at Risk project (HEAR).

Taxonomic information about Mucuna pruriens may be available from the Germplasm Resources Information Network (GRIN).

References:

Bishop Museum (Honolulu). 1969. Voucher specimen #BISH 32844 (JWP 16686).

Bishop Museum (Honolulu). 1969. Voucher specimen #BISH 32845 (JWP 16686).

Buckles, D./Triomphe, B./Sain, G. 2005. Cover Crops in Hillside Agriculture: Farmer Innovation with Mucuna. International Development Research Centre . 230 pp.

Cardenas, Juan/Reys, Carlos E./Doll, Jerry D./Pardo, Fernando. 1972. Tropical weeds; malezas tropicales, vol. 1. International Plant Protection Center, Oregon State University, Corvallis. 341 pp.

Csurhes, S./Edwards, R. 1998. Potential environmental weeds in Australia: Candidate species for preventative control. Canberra, Australia. Biodiversity Group, Environment Australia. 208 pp.

Fosberg, F. R./Sachet, Marie-Hélène/Oliver, Royce. 1979. A geographical checklist of the Micronesian dicotyledonae. Micronesica 15:1-295.

Hancock, I. R./Henderson, C. P. 1988. Flora of the Solomon Islands. Research Bulletin No. 7. Ministry of Agriculture and Lands, Honiara. 203 pp.

Holm, Leroy/Pancho, Juan V./Herberger, James P./Plucknett, Donald L. 1979. A geographical atlas of world weeds. John Wiley & Sons, New York. 391 pp.

ILDIS Co-ordinating Centre. 2005. International Legume Database & Information Service. Online searchable database.

Imada, Clyde T./Staples, George W./Herbst, Derral R. 2006. Annotated checklist of cultivated plants of Hawai‘i (online searchable database).

MacKee, H. S. 1994. Catalogue des plantes introduites et cultivées en Nouvelle-Calédonie. Muséum National d'Histoire Naturelle, Paris, 164 p.

Orchard, Anthony E., ed. 1993. Flora of Australia. Vol. 50, Oceanic islands 2. Australian Government Publishing Service, Canberra.

Smith, Albert C. 1985. Flora Vitiensis nova: a new flora of Fiji. National Tropical Botanical Garden, Lawai, Kauai, Hawaii. Volume 3. 758 pp.

Smith, Nicholas M. 2002. Weeds of the wet/dry tropics of Australia - a field guide. Environment Centre NT, Inc. 112 pp.

Space, James C./Falanruw, Marjorie. 1999. Observations on invasive plant species in Micronesia. USDA Forest Service, Honolulu. Report to the Pacific Islands Committee, Council of Western State Foresters. USDA Forest Service, Honolulu. 32 pp.

Space, James C./Waterhouse, Barbara/Denslow, Julie S./Nelson, Duane. 2000. Invasive plant species on Rota, Commonwealth of the Northern Mariana Islands.  USDA Forest Service, Honolulu. 31 pp.

Stone, Benjamin C. 1970. The flora of Guam. Micronesica 6:1-659.

U.S. Dept. Agr., Agr. Res. Serv. 2007. National Genetic Resources Program. Germplasm Resources Information Network (GRIN). Online searchable database.

Waterhouse, B. M./Mitchell, A. A. 1998. Northern Australia Quarantine Strategy: weeds target list. Second edition. Australian Quarantine & Inspection Service, Miscellaneous Publication No. 6/98. 110 pp.

Welsh, S. L. 1998. Flora Societensis: A summary revision of the flowering plants of the Society Islands. E.P.S. Inc., Orem, Utah. 420 pp.