Pacific Island Ecosystems at Risk (PIER)

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Heterotheca grandiflora
Nutt., Asteraceae
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Present on Pacific Islands?  yes

Primarily a threat at high elevations?  no

Risk assessment results:  Risk assessment of Heterotheca grandiflora from the Government of Queensland, Australia (PDF format)

Common name(s): [more details]

English: silk-grass golden-aster, telegraph weed

Habit:  herb

Description:  "Aromatic annual or biennial herbs; stems 5-20 dm long, stout and unbranched below the inflorescence, branched in the inflorescence, coarsely hirsute and glandular pubescent above.  Leaves ovate to oblong or oblanceolate, 2-8 cm long, 1-3.5 cm wide, densely villous to hirsute, margins coarsely serrate, lower ones on petioles 1-4 cm long, upper ones sessile and often with stipule-like lobes at base.  Heads several to numerous; involucre 7-9 mm high; ray florets 25-35 per head, rays 4-6 mm long; disk corollas ca. 4 mm long; pappus yellowish brown to reddish, the outer series inconspicuous.  Achenes 3-3.5 mm long, inner ones strongly flattened"  (Wagner et al., 1999; p. 326).

Habitat/ecology:  "In Hawai‘i, "a relatively common weed of dry, disturbed areas, 10-2,270 m" (Wagner et al., 1999; p. 326).  On the Gold Coast of southeast Queensland, Australia, "it has become common along roadsides and tracks on coastal sand dunes" (Csurhes & Edwards, 1998; p. 166).

Propagation:  Wind-borne seed (Csurhes & Edwards, 1998; p. 166).

Native range:  "California to Arizona and Baja California, Mexico" (Wagner et al., 1999; p. 326).

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) (p. 326)
State of Hawaii
Hawaiian Islands
Kaho‘olawe Island introduced
invasive
Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (p. 326)
State of Hawaii
Hawaiian Islands
Kaua‘i Island introduced
invasive
Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (p. 326)
State of Hawaii
Hawaiian Islands
Lāna‘i Island introduced
invasive
Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (p. 326)
State of Hawaii
Hawaiian Islands
Maui Island introduced
invasive
Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (p. 326)
Voucher cited: Faurie 937 (BISH)
State of Hawaii
Hawaiian Islands
Moloka‘i Island introduced
invasive
Oppenheimer, Hank (2010) (pp. 33-34)
Voucher cited: Oppenheimer & R. Kallstrom H90808 (BISH, PTBG)
State of Hawaii
Hawaiian Islands
O‘ahu Island introduced
invasive
Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (p. 326)
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)
New South Wales introduced
invasive
Csurhes, S./Edwards, R. (1998) (p. 166)
Naturalized
Australia
Australia (continental)
Queensland introduced
invasive
Csurhes, S./Edwards, R. (1998) (p. 166)
Naturalized
Japan
Japan
Japan (country) introduced
Mito, Toshikazu/Uesugi, Tetsuro (2004) (p. 190)
Mexico
Mexico
Mexico (United Mexican States) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Baja Norte
United States (west coast)
United States (west coast states)
USA (California) native
U.S. Dept. Agr., Agr. Res. 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) uncertain if native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Arizona, Nevada, Utah


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

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This page was created on 20 MAR 2005 and was last updated on 8 MAY 2017.