Pacific Island Ecosystems at Risk (PIER)

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Crepis vesicaria subsp. taraxacifolia
(Thuill.)Thuill., Asteraceae
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Present on Pacific Islands?  yes

Primarily a threat at high elevations?  no

Other Latin names:  Crepis taraxacifolia Thuill.; Crepis vesicaria subsp. haenseleri (Boiss. ex DC.) P. D. Sell

Common name(s): [more details]

English: beaked hawk's-beard, dandelion hawk's-beard, weedy hawk's-beard

Habit:  herb

Description:  "Annual or biennial. Stems erect or ascending, branching, ribbed to grooved, 15-75-(100) cm tall; hairs both white, slender, crinkly, subappressed, and red-based, stout, straight, spreading. Rosette and lower stem leaves thick, petiolate, oblong to oblanceolate, usually deeply runcinately 1-2-pinnatifid, rarely simple and shallowly pinnatifid or toothed, (7)-10-20-(35) x (2)-4-8-(12) cm; hairs pale, 0.2-0.5 mm long, on both surfaces and margins; lobes slightly recurved, toothed or divided. Stem leaves similar, deeply pinnatisect to not lobed, toothed, sessile, subauriculate or lobed at base. Capitula campanulate; buds erect. Involucral bracts with pale subappressed cobwebby hairs and often dark, spreading glandular hairs on outer surface, and fine appressed straight hairs on inner surface; outer bracts 6-12, lanceolate to ovate-lanceolate, ?-1/2 length of inner bracts; inner bracts lanceolate, not keeled, (6)-9-12 mm long, with pale to scarious glabrous margins. Receptacle areoles with raised ciliate margins. Corolla yellow, sometimes with red stripe on outer face of ligule. Achenes brown, 10-ribbed, fusiform, scabrid, all long-beaked, 6-9 mm long. Pappus bristles in 1-(2) rows, fine, white"  (Webb et al., 1988; p. 324).

Habitat/ecology:  In New Zealand, "roadsides, railway yards, waste land, arable land"  (Webb et al., 1988; p. 324).

Propagation:  Seed

Native range:  Europe and northern Africa; naturalized elsewhere (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
Staples, George W./Imada, Clyde T./Herbst, Derral R. (2002) (p. 5)
Voucher cited: L. Yoshida 79.099 (BISH)
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
invasive
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Naturalized
Canada (British Colombia)
Province of British Columbia
Canada (British Columbia) introduced
U.S. Dept. Agr., Nat. Res. Cons. Serv. (2013)
Chile (continental)
Chile
Chile (Republic of) introduced
invasive
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Naturalized
New Zealand
New Zealand
New Zealand (country) introduced
invasive
Webb, C. J./Sykes, W. R./Garnock-Jones, P. J. (1988) (p. 324)
United States (west coast)
United States (west coast states)
USA (Oregon) introduced
U.S. Dept. Agr., Nat. Res. Cons. Serv. (2013)
United States (west coast)
United States (west coast states)
USA (California) introduced
invasive
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Naturalized
United States (west coast)
United States (west coast states)
USA (Washington) introduced
U.S. Dept. Agr., Nat. Res. Cons. Serv. (2013)
Also reported from
Country/Terr./St. &
Island group
Location Cited status &
Cited as invasive &
Cited as cultivated &
Cited as aboriginal introduction?
Reference &
Comments
United States (continental except west coast)
United States (other states)
United States (other states) introduced
U.S. Dept. Agr., Nat. Res. Cons. Serv. (2013)


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