Crotalaria micans Link, Fabaceae

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Present on Pacific Islands?  yes

Primarily a threat at high elevations?  no

Other Latin names:  Crotalaria anagyroides Kunth; Crotalaria brachystachys Benth.

Common name(s): [more details]

Chinese: san jian ye zhu shi dou

Niuean: pile, pinē kotalelia

Habit:  shrub

Description:  "Perennial herbs, subshrubs, or small shrubs; stems ascending or erect, up to 35 dm long, weakly striate, appressed or spreading short-pubescent.  Leaves trifoliolate, leaflets elliptic obovate, or oblanceolate, 2.5-10.2 cm long, 0.7-3.5 cm wide, veins 5-20 on each side of midvein, upper surface glabrous or sparsely pubescent, lower surface appressed short-pubescent to densely spreading pubescent, apex rounded to acute, occasionally acuminate or mucronulate, base cuneate or broadly cuneate, petioles 4-92 mm long, stipules absent or minute and setaceous.  Flowers 16-19 mm long, 10-30 in terminal, crowded inflorescences, these terminated by a tuft of curled bracts, rachis up to 26 cm long (incl. peduncle), bracts linear-triangular, 8-13 mm long, ascending, caducous, bracteoles at apex of pedicel, linear-triangular; calyx appressed short-pubescent to spreading pubescent, occasionally sericeous, the tube 4-5 mm long, the lobes 4.9-5.9 mm long, lateral lobes connate at apex; petals yellow with lines near base, standard 13-14 mm long, 18-21 mm wide, wings oblong, 12.5-16 mm long, 7.8-9 mm wide, keel petals with a moderately long, nontwisted beak, densely pubescent externally below beak, margins ciliate; elongated anthers 3-3.3 mm long, short ones 1-1.1 mm long.  Pods brown at maturity, 2-3.5 cm long, stipitate, stipe 3-6 mm long, appressed short-pubescent.  Seeds ca 20 per pod, tan to brown, up to 3.5 mm long, smooth"  (Wagner et al., 1999; p. 661).

Habitat/ecology:  Introduced in the past as an agriculture cover crop or as an ornamental.  Weedy, mostly along roadsides and other disturbed areas, sometimes in dense stands.  In Hawai‘i, "growing in disturbed sites, 50-530 m" (Wagner et al., 1999; p. 661).  On Niue, locally abundant in open or scrub-covered country" (Sykes, 1970; p. 148).

Propagation:  Seed

Native range:  Neotropics; cultivated in paleotropics (GRIN).

Presence:

Pacific
Country/Terr./St. & Island group	Location	Cited status & Cited as invasive & Cited as cultivated & Cited as aboriginal introduction?	Reference & Comments
Cook Islands Southern Cook Islands	Aitutaki Atoll		Bishop Museum (Honolulu) (1977) (voucher ID: BISH 420152) Taxon name on voucher: Crotalaria anagyroides HBK.
Cook Islands Southern Cook Islands	Aitutaki Atoll		Bishop Museum (Honolulu) (1979) (voucher ID: BISH 618517) Taxon name on voucher: Crotalaria anagyroides HBK.
Cook Islands Southern Cook Islands	‘Atiu Island		Bishop Museum (Honolulu) (1991) (voucher ID: BISH 664483) Taxon name on voucher: Crotalaria anagyroides HBK.
Cook Islands Southern Cook Islands	Mangaia Island		McCormack, Gerald (2013)
Cook Islands Southern Cook Islands	Mangaia Island	introduced invasive	Space, James C./Flynn, Tim (2002) (p. 85) Voucher: Flynn 7015 (PTBG, BISH, US)
Cook Islands Southern Cook Islands	Mangaia Island		National Tropical Botanical Garden (U.S.A. Hawaii. Kalaheo.) (2002) (voucher ID: PTBG 348) Taxon name on voucher: Crotalaria micans
Cook Islands Southern Cook Islands	Ma‘uke Island		McCormack, Gerald (2013)
Federated States of Micronesia Pohnpei Islands	Pohnpei Island	introduced cultivated	Herrera, Katherine/Lorence, David H./Flynn, Timothy/Balick, Michael J. (2010) (p. 90) Voucher cited: M. Tamakatsu 777 (BISH)
Federated States of Micronesia Pohnpei Islands	Pohnpei Island		Bishop Museum (Honolulu) (1936) (voucher ID: BISH 153962) Taxon name on voucher: Crotalaria anagyroides HBK.
Federated States of Micronesia Yap Islands	Yap (Waqab) Island	introduced	Fosberg, F. R./Sachet, Marie-Hélène/Oliver, Royce (1979) (p. 106)
Fiji Fiji Islands	Viti Levu Island	introduced invasive cultivated	Smith, Albert C. (1985) (p. 271) Vouchers cited: DA 8491, DA 9566, DA 2410, DA 12131 Perhaps naturalized.
Fiji Fiji Islands	Viti Levu Island		Bishop Museum (Honolulu) (1955) (voucher ID: BISH 14427) Taxon name on voucher: Crotalaria anagyroides HBK.
State of Hawaii Hawaiian Islands	Hawai‘i (Big) Island	introduced invasive	Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (p. 661)
State of Hawaii Hawaiian Islands	Maui Island	introduced invasive	Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (p. 661)
State of Hawaii Hawaiian Islands	O‘ahu Island	introduced invasive	Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (p. 661)
Niue Niue	Niue Island	introduced invasive	Sykes, W. R. (1970) (p. 148) Vouchers cited: CHR 150541, CHR 150544
Niue Niue	Niue Island	introduced invasive	Space, James C./Flynn, Tim (2000) (p. 7) As Crotalaria anagyroides HBK. Voucher: Flynn 6682 (PTBG, US, NIUE)
Niue Niue	Niue Island	introduced invasive	Whistler, W. A./Atherton, J. (1997) (p. 34)
Niue Niue	Niue Island	introduced cultivated	Yuncker, T. G. (1943) (p. 61) Voucher cited: Yuncker 9674 (BISH). "The seeds have been scattered throughout the island in the hope that the growth of the plant will improve the poor soil".
Niue Niue	Niue Island	introduced invasive	Space, James C./Waterhouse, Barbara M./Newfield, Melanie/Bull, Cate (2004) (p. 14)
Niue Niue	Niue Island		National Tropical Botanical Garden (U.S.A. Hawaii. Kalaheo.) (2000) (voucher ID: PTBG 30183) Taxon name on voucher: Crotalaria anagyroides H. B. K.
Palau Palau (Belau ) (main island group)	Babeldaob Island	introduced invasive	Space, James C./Waterhouse, Barbara/Miles, Joel E./Tiobech, Joseph/Rengulbai, Kashgar (2003) (p. 85)
Papua New Guinea Bismarck Archipelago	Bismarck Archipelago	introduced	Verdcourt, B. (1979)
Papua New Guinea Bismarck Archipelago	Bismarck Archipelago	introduced	ILDIS Co-ordinating Centre (2013)
Papua New Guinea Bismarck Archipelago	Bismarck Archipelago	introduced cultivated	Peekel, P. G. [translated by E. E. Henty] (1984) (p. 229) Introduced for suppressing weeds in plantations and for soil improvement; used as an ornamental plant.
Papua New Guinea Papua New Guinea (eastern New Guinea Island)	Papua New Guinea (eastern New Guinea Island)	introduced	ILDIS Co-ordinating Centre (2013)
Philippines Philippine Islands	Philippine Islands	introduced	ILDIS Co-ordinating Centre (2013)
Samoa Western Samoa Islands	Savai‘i Island		Bishop Museum (Honolulu) (1968) (voucher ID: BISH 28867) Taxon name on voucher: Crotalaria anagyroides HBK.
Samoa Western Samoa Islands	Savai‘i Island		Bishop Museum (Honolulu) (1972) (voucher ID: BISH 100419) Taxon name on voucher: Crotalaria anagyroides HBK.
Samoa Western Samoa Islands	Savai‘i Island		Bishop Museum (Honolulu) (1979) (voucher ID: BISH 439251) Taxon name on voucher: Crotalaria anagyroides HBK.
Samoa Western Samoa Islands	Western Samoa Islands	introduced	ILDIS Co-ordinating Centre (2013)

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)	Australia (continental)	introduced	ILDIS Co-ordinating Centre (2013)
Central America Central America (Pacific rim)	Costa Rica (Republic of)	native	U.S. Dept. Agr., Agr. Res. Serv. (2013)
Central America Central America (Pacific rim)	El Salvador (Republic of)	native	U.S. Dept. Agr., Agr. Res. Serv. (2013)
Central America Central America (Pacific rim)	Honduras (Republic of)	native	U.S. Dept. Agr., Agr. Res. Serv. (2013)
Central America Central America (Pacific rim)	Nicaragua (Republic of)	native	U.S. Dept. Agr., Agr. Res. Serv. (2013)
Central America Central America (Pacific rim)	Panama (Republic of)	native	U.S. Dept. Agr., Agr. Res. Serv. (2013)
China China	China (People's Republic of)	introduced invasive cultivated	Zhengyi, Wu/Raven, Peter H./Deyuan, Hong (2013) "Grasslands, slopes, along trails; below 100-2400 m".
Indonesia Indonesia	Indonesia (Republic of)	introduced	ILDIS Co-ordinating Centre (2013)
Indonesia Indonesia	West Papua Province (Indonesia) (western New Guinea Island) (formerly Irian Jaya)	introduced	ILDIS Co-ordinating Centre (2013)
Mexico Mexico	Mexico (United Mexican States)	native	U.S. Dept. Agr., Agr. Res. Serv. (2013) Colima, Guerrero, Jalisco, Michoacan, Nayarit
South America (Pacific rim) South America (Pacific rim)	Colombia	native	U.S. Dept. Agr., Agr. Res. Serv. (2013)
South America (Pacific rim) South America (Pacific rim)	Ecuador (Republic of) (continental)	native	U.S. Dept. Agr., Agr. Res. Serv. (2013)
South America (Pacific rim) South America (Pacific rim)	Perú (Republic of)	native	U.S. Dept. Agr., Agr. Res. Serv. (2013)
Taiwan Taiwan Island	Taiwan Island	introduced invasive cultivated	Zhengyi, Wu/Raven, Peter H./Deyuan, Hong (2013) "Grasslands, slopes, along trails; below 100-2400 m".
Thailand Thailand	Thailand (Kingdom of)	introduced	ILDIS Co-ordinating Centre (2013)
Vietnam Vietnam	Vietnam (Socialist Republic of)	introduced	ILDIS Co-ordinating Centre (2013)

Comments:  Wagner et al. (1999; p. 661) and GRIN list C. anagyroides and C. micans as synonyms but Tim Flynn reports that the specimens in the Bishop Museum do not match.

Control:  If you know of control methods for Crotalaria micans, please let us know.