Pacific Island Ecosystems at Risk (PIER)

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Crotalaria assamica
Benth., Fabaceae
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Present on Pacific Islands?  yes

Primarily a threat at high elevations?  no

Common name(s): [more details]

Chinese: da zhu shi dou

English: Indian rattlebox

Habit:  herb

Description:  "Subshrubs; stems erect or ascending, up to 20 dm long, ridged, densely short-pubescent.  Leaves simple, elliptic to oblanceolate, 7.8-16.5 cm long, 2.4-3.6 cm wide, veins 13-16 on each side of midvein, upper surface glabrous and slightly punctate, lower surface appressed short-pubescent, apex obtuse to acute, usually mucronulate, base cuneate, petioles 4-6 mm long, stipules minute, subulate.  Flowers 18-25 mm long, 12-22 in somewhat lax inflorescences, rachis 15-29 cm long (incl. peduncle), bracts narrowly triangular, 2.5-3.3 mm long, spreading, usually persistent, bracteoles at mid-pedicel, narrowly triangular; calyx appressed short-pubescent, the tube 4.5-7 mm long, the lobes 8-10 mm long, lateral lobes distinct at apex; petals yellow, standard 15-16 mm long, wings oblong, 12-13 mm long, 6-7.5 mm wide, claws 3.9-4.1 mm long, keel petals short, beak slightly twisted, margins ciliate; elongated anthers 2.6-5 mm long, short ones 0.8-0.9 mm long.  Pods dark brown at maturity, 3.5-5 cm long, short-stipitate, glabrous.  Seeds ca. 30 per pod, dark brown, up to 4 mm long, smooth"  (Wagner et al., 1999; pp. 657-658).

Habitat/ecology:  In Hawai‘i, "naturalized in disturbed mesic sites, 480-560 mm"  (Wagner et al., 1999; p. 658).

Propagation:  Seed

Native range:  Native to India  (Wagner et al., 1999; p. 658). China, India, Southeast Asia, Philippines (GRIN).

Presence:

Pacific
Country/Terr./St. &
Island group
Location Cited status &
Cited as invasive &
Cited as cultivated &
Cited as aboriginal introduction?
Reference &
Comments
State of Hawaii
Hawaiian Islands
Hawai‘i (Big) Island introduced
invasive
Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (pp. 657-658)
State of Hawaii
Hawaiian Islands
Maui Island introduced
invasive
Starr, Forest/Martz, Kim/Loope, Lloyd L. (2002) (p. 20)
Vouchers cited: Starr & Martz 010309-2 (BISH); East Maui: R. Hobdy 3593 (BISH)
State of Hawaii
Hawaiian Islands
Moloka‘i Island introduced
invasive
Starr, Forest/Starr, Kim/Loope, Lloyd L. (2006) (p. 35)
Voucher cited: Starr, Starr, Buchanan & Hart 050518-5 (BISH)
State of Hawaii
Hawaiian Islands
O‘ahu Island introduced
invasive
Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (pp. 657-658)
Voucher cited: Mann & Brigham 62 (BISH)
Philippines
Philippine Islands
Philippine Islands native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Philippines
Philippine Islands
Philippine Islands native
Merrill, Elmer D. (1923) (p. 271)
Occasional in ravines, thickets, etc., at low and medium altitudes.
Pacific Rim
Country/Terr./St. &
Island group
Location Cited status &
Cited as invasive &
Cited as cultivated &
Cited as aboriginal introduction?
Reference &
Comments
China
China
China (People's Republic of) native
Zhengyi, Wu/Raven, Peter H./Deyuan, Hong (2013)
"Montane grasslands, along trails; below 100-3000 m".
Japan
Japan
Japan (country) introduced
Mito, Toshikazu/Uesugi, Tetsuro (2004) (p. 184)
Taiwan
Taiwan Island
Taiwan Island native
Zhengyi, Wu/Raven, Peter H./Deyuan, Hong (2013)
"Montane grasslands, along trails; below 100-3000 m".
Thailand
Thailand
Thailand (Kingdom of) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Vietnam
Vietnam
Vietnam (Socialist Republic of) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)


Need more info? Have questions? Comments? Information to contribute? Contact PIER! (pier@hear.org)

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This page was created on 11 FEB 2010 and was last updated on 17 MAR 2013.