Pacific Island Ecosystems at Risk (PIER)

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Flaveria trinervia
(Spreng.) C.Mohr, Asteraceae
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Present on Pacific Islands?  yes

Primarily a threat at high elevations?  no

Other Latin names:  Flaveria australasica Hook.; Oedera trinervia Spreng.

Common name(s): [more details]

English: clustered yellowtops, speedyweed, yellow twinstem

Habit:  herb

Description:  "Taprooted annual herbs 1.5-8 (-20) dm tall, puberulent or subglabrous; stems often purplish, divaricately branched.  Leaves lanceolate, oblanceolate to elliptic or narrowly ovate, 3-15 cm long, (0.7-) 1-4 cm wide, distinctly 3-nerbed from base, margins subentire to serrate-dentate, petioles of principal leaves 1-2 cm long, petiole bases nearly connate, upper leaves sessile and usually connate.  Heads with a single floret, aggregated into secondary head-like clusters ca. 1 cm in diameter the common receptacle thus formed with scattered bristles ca. 1/2 as long to as long as primary heads, secondary heads subtended by a few leafy bracts, heads radiate or discoid, radiate heads usually peripheral in secondary heads, the central ones usually discoid; involucre of primary heads of 1-2 bracts, 3-4.5 mm long; rays pale yellow or whitish, 0.5-1 mm long; disk corollas 2-2.5 mm long; pappus absent.  Achenes 2-2.6 mm long"  (Wagner et al., 1999; p. 317).

Habitat/ecology:  "A widespread tropical and subtropical weed; in Hawai‘i sparingly naturalized in strand vegetation and coastal sites" (Wagner et al., 1999; p. 317).

Propagation:  Seed

Native range:  The Americas; 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
Kaho‘olawe Island introduced
invasive
Herbst, Derral R./Wagner, Warren L. (1996) (pp. 9-10)
Voucher cited: Ellshoff 196 (BISH)
State of Hawaii
Hawaiian Islands
Kaua‘i Island introduced
invasive
Lorence, David H./Flynn, Timothy W./Wagner, Warren L. (1995) (p. 24)
Voucher cited: T. Flynn et al. 3186 (BISH, F, MO, PTBG, US)
State of Hawaii
Hawaiian Islands
Kure Atoll introduced
invasive
Starr, Forest/Starr, Kim/Loope, Lloyd L. (2010) (p. 62)
Voucher cited: Starr & Starr 010522-02 (BISH)
State of Hawaii
Hawaiian Islands
Maui Island introduced
invasive
Oppenheimer, Hank L. (2003) (p. 7)
West Maui. Vouchers cited: Oppenheimer H80108 (BISH, PTBG), Starr & Martz 000204-1 (BISH), Oppenheimer H100044 (BISH, PTBG), Oppenheimer H40135 (BISH, PTBG)
State of Hawaii
Hawaiian Islands
O‘ahu Island introduced
invasive
Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (p. 317)
Voucher cited: Engler 37-232 (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)
South Australia, Western Australia
Naturalized
Australia
Australia (continental)
New South Wales introduced
invasive
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Naturalized
Australia
Australia (continental)
Northern Territory introduced
invasive
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Naturalized
Australia
Australia (continental)
Queensland introduced
invasive
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Naturalized
Mexico
Mexico
Mexico (United Mexican States) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Perú
Perú
Perú (Republic of) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Arequipa
United States (west coast)
United States (west coast states)
USA (California) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Indian Ocean
Country/Terr./St. &
Island group
Location Cited status &
Cited as invasive &
Cited as cultivated &
Cited as aboriginal introduction?
Reference &
Comments
Mauritius
Mautitius Islands (Mauritius and Rodrigues)
Mauritius Island introduced
invasive
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Naturalized
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) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
United States (continental except west coast)
United States (other states)
USA (Florida) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)


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This page was created on 13 DEC 2005 and was last updated on 2 MAY 2013.