Pacific Island Ecosystems at Risk (PIER)

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Desmodium scorpiurus
(Sw.) Desv., Fabaceae
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Present on Pacific Islands?  yes

Primarily a threat at high elevations?  no

Risk assessment results:  More information needed, score: 5 (Go to the risk assessment)

Common name(s): [more details]

Chinese: xie wei shan ma huang

English: scorpion ticktrefoil

Habit:  herb

Description:  "Subshrubby, prostrate or scandent to ascending; stem terete to angled, uncinulate-pilosulous; petioles 0.8-1.2 cm long, rachis up to 0.3 cm long; petiolules ca 1 mm long; leaflets mostly narrowly to broadly elliptic, obtuse, appressed-pilose above and below with midrib and chief lateral veins prominent on lower surface, terminal leaflet 1.1-2 cm long, 0.5-1 cm wide, lateral leaflets 1-1.5 cm long, 0.4-0.7 cm wide; stipules 3-4.5 mm long; stipels 1-2 mm long; inflorescence racemose, rachis very finely striate, puberulent; primary bracts up to ca 4 mm long, secondary bracts ca 2 mm long; pedicels puberulent, up to ca 7 mm long; calyx spreading-pilose with central tooth of lower lobe 2 mm long, lateral teeth 1.75 mm long, upper lobe bifid, 2 mm long; standard 3.5 mm long, 1.25 mm wide, wings equaling standard, keel-petals 4 mm long, 1.5 mm wide; loment short-stipitate, usually5-articulate, articles mostly oblong, scarcely if at all narrowed at isthmus, reticulate, uncinulate-pubescent, up to about 5 mm long, 1.5 mm wide"  (Macbride, 1948; p. 433).

"Trailing herb with alternate trifoliate leaves, white (Samoa) or mauve (Tonga) papilionaceous flowers, and jointed pods with cylindrical segments" (Whistler, 1988; p. 24).

Habitat/ecology:  In Fiji, "occasionally naturalized along roadsides near sea level" (Smith, 1985; pp. 190-191).  "Uncommon in disturbed places in coastal areas" (Whistler, 1988; p. 24).  In Jamaica, "rather common, a weed of sandy pastures and roadsides and rocky or stony waste ground, sea level to 1100 ft"  (Adams, 1972; p. 374).

Propagation:  Seed

Native range:  "West Indies and Mexico southward to Peru, now introduced into and adventive in many other areas" (Smith, 1985; pp. 190-191).

Presence:

Pacific
Country/Terr./St. &
Island group
Location Cited status &
Cited as invasive &
Cited as cultivated &
Cited as aboriginal introduction?
Reference &
Comments
Cook Islands
Cook Islands
Cook Islands   McCormack, Gerald (2013)
Fiji
Fiji Islands
Ovalau Island introduced
invasive
Smith, Albert C. (1985) (pp. 190-191)
Voucher cited: DA 17039
Fiji
Fiji Islands
Viti Levu Island introduced
invasive
Smith, Albert C. (1985) (pp. 190-191)
Vouchers cited: DA 14354, Tothill 108, DA 35, DA 3075, DA 4049, DA 5819, DA 5820, L.11427
French Polynesia
Gambier Islands
Mangareva (Gambier) Island introduced
invasive
Florence, J./Chevillotte, H./Ollier, C./Meyer, J.-Y. (2013)
Voucher cited: B. Huguenin s.n. (PAP)
Adventice
French Polynesia
Society Islands
Maupiti (Maurua) Island   Fosberg, F. R./Sachet, M.-H. (1987) (p. 35)
Voucher cited: Fosberg 64846 (US)
French Polynesia
Society Islands
Maupiti (Maurua) Island introduced
invasive
Florence, J./Chevillotte, H./Ollier, C./Meyer, J.-Y. (2013)
Adventice
French Polynesia
Society Islands
Maupiti (Maurua) Island   National Tropical Botanical Garden (U.S.A. Hawaii. Kalaheo.) (1985) (voucher ID: PTBG 23242)
Taxon name on voucher: Desmodium scorpiurus Desv.
French Polynesia
Society Islands
Tahiti Island introduced
invasive
Welsh, S. L. (1998) (p. 150)
Vouchers cited: Grant 4887, GRant 5362, Barrau 2006
French Polynesia
Society Islands
Tahiti Island introduced
invasive
Florence, J./Chevillotte, H./Ollier, C./Meyer, J.-Y. (2013)
Adventice
Papua New Guinea
Bismarck Archipelago
New Britain Island   Peekel, P. G. [translated by E. E. Henty] (1984) (p. 237)
In places with volcanic soil.
Philippines
Philippine Islands
Philippine Islands introduced
invasive
Merrill, Elmer D. (1923) (p. 289)
In open dry thickets, on cliffs, in grasslands, etc., at low and medium altitudes.
Samoa
Western Samoa Islands
Western Samoa Islands   Whistler, W. A. (1988) (p. 24)
Solomon Islands
Solomon Islands
Solomon Islands introduced
invasive
Hancock, I. R./Henderson, C. P. (1988) (p. 66)
Tonga
Ha‘apai Group
Ha‘apai Islands   Whistler, W. A. (1988) (p. 24)
Tonga
Vava‘u Group
Vava‘u Island   Whistler, W. A. (1988) (p. 24)
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) introduced
invasive
Zhengyi, Wu/Raven, Peter H./Deyuan, Hong (2013)
"Open dry places; low and middle elevations (sea level to 500 m)".
China
China
Hong Kong introduced
Wu, Te-lin (2001) (p. 143)
Costa Rica
Costa Rica
Costa Rica (Republic of) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Ecuador (Mainland)
Ecuador
Ecuador (Republic of) (continental) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Guatemala
Guatemala
Guatemala (Republic of) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Honduras
Honduras
Honduras (Republic of) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Japan
Japan
Japan (country) introduced
Mito, Toshikazu/Uesugi, Tetsuro (2004) (p. 184)
Mexico
Mexico
Mexico (United Mexican States) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Nicaragua
Nicaragua
Nicaragua (Republic of) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Panama
Panama
Panama (Republic of) uncertain if native
ILDIS Co-ordinating Centre (2013)
Perú
Perú
Perú (Republic of) uncertain if native
ILDIS Co-ordinating Centre (2013)
Taiwan
Taiwan Island
Taiwan Island introduced
invasive
Zhengyi, Wu/Raven, Peter H./Deyuan, Hong (2013)
"Introduced and naturalized in outhern Taiwan".


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This page was created on 1 JAN 1999 and was last updated on 15 OCT 2006.