Pacific Island Ecosystems at Risk (PIER)

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Gamochaeta pensylvanica
(Willd.) Cabrera, Asteraceae
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Present on Pacific Islands?  yes

Primarily a threat at high elevations?  no

Other Latin names:  Gnaphalium pensylvanicum Willd.

Common name(s): [more details]

Chinese: shi ye he guan shu qu cao

English: Pennsylvania cudweed

Habit:  herb

Description:  "Annual, 10-40 cm tall, usually branched only at base; stems 1-few, erect or ascending.  Basal leaves mostly 0 at flowering, sometimes present and withered.  Lower cauline leaves apetiolate, sparsely tomentose on upper surface, densely tomentose on lower, more or less concolorous to somewhat discolourous, plane, usually obovate and long-cuneate, sometimes oblanceolate, obtuse to acute, mucronate, flat or slightly undulate, (10)-20-40-(60) x 3-8-(12) mm, upper cauline leaves similar but smaller, narrower and broader based, sometimes folded.  Capitula in dense terminal and axillary clusters; clusters usually forming dense terminal spikes at ends of branches and scattered below.  Involucral bracts oblong, obtuse to apiculate, 2.5-3 mm long; stereome green; lamina pale brown, gap and margins clear; outer bracts almost covered by hairs.  Achenes minutely papillate, 0.4-0.5 mm long"  (Webb et al., 1988; pp. 238-239).

Description from the Flora of China online.
Description from the Flora of North America online.

Habitat/ecology:  On Raoul Island, "waste places coastal sites, scrubland" (Webb et al., 1988; pp. 238-239).

Propagation:  Seed

Native range:  Bahamas, Cuba, Jamaica, Central and South America; naturalized elsewhere; exact native and naturalized range uncertain owing to confusion with other taxa (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
Alford, Mac H. (2012) (p. 3)
Vouchers cited: Fagerlund & Mitchell 73 (BISH), Funk s.n. (BISH), Herbst 5295 (BISH), Higashino et al. 10326 (BISH), Hosaka 2080 (BISH), Hosaka 2301 (BISH), Rock 3133 (BISH), Rock 4619 (BISH), Rock 4621 (BISH), Warshauer & McEldowney 2052 (BISH)
State of Hawaii
Hawaiian Islands
Kaho‘olawe Island introduced
invasive
Alford, Mac H. (2012) (p. 3)
Vouchers cited: Char 78.015 (BISH), Clarke & Corn 366 (BISH), Cuddihy & Char 326 (BISH), Cuddihy & Char 353 (BISH), Cuddihy & Char 355 (BISH)
State of Hawaii
Hawaiian Islands
Kaua‘i Island introduced
invasive
Alford, Mac H. (2012) (pp. 3-4)
Vouchers cited: Corn ESP 177 (BISH), Flynn 791 (BISH), Wagner et al. 5157 (BISH)
State of Hawaii
Hawaiian Islands
Lāna‘i Island introduced
invasive
Alford, Mac H. (2012) (p. 4)
Vouchers cited: Degener & Degener 28408 (BISH), Starr 060406-15 (BISH)
State of Hawaii
Hawaiian Islands
Ni‘ihau, Lehua Islet introduced
invasive
Wood, K. R./LeGrande, Maya (2006) (p. 20)
Voucher cited: Flynn et al. 4852 (BISH, PTBG). Misidentified as Gamochaeta purpurea (L.) Cabrera per Alford (2012).
State of Hawaii
Hawaiian Islands
Ni‘ihau, Lehua Islet introduced
invasive
Alford, Mac H. (2012) (p. 4)
Voucher cited: Flynn et al. 4852 (BISH, PTBG)
State of Hawaii
Hawaiian Islands
Maui Island introduced
invasive
Alford, Mac H. (2012) (p. 4)
Vouchers cited: Hosaka 1797 (BISH), Oppenheimer et al H10211 (BISH)
State of Hawaii
Hawaiian Islands
Moloka‘i, Mokapu Islet introduced
invasive
Alford, Mac H. (2012) (p. 4)
Voucher cited: Oppenheimer & Penniman H40918 (BISH)
State of Hawaii
Hawaiian Islands
Moloka‘i Island introduced
invasive
Alford, Mac H. (2012) (p. 4)
Vouchers cited: Fosberg 29561 (BISH), Hosaka 1847 (BISH)
State of Hawaii
Hawaiian Islands
Maui, Molokini Islet introduced
invasive
Alford, Mac H. (2012) (p. 4)
Vouchers cited: Hobdy 1239 (BISH), Starr 060405-09 (BISH)
State of Hawaii
Hawaiian Islands
O‘ahu Island introduced
invasive
Alford, Mac H. (2012) (p. 4)
Vouchers cited: Degener 18446 (BISH, US), Degener & Topping 11119 (UC, US), Egler 37-55 (BISH), Egler 37-241 (BISH), Fosberg 9475 (BISH), Fosberg 10562 (BISH), Fosberg 12939 (BISH), Herbst & Ishikawa 5269 (BISH), St. John 10406 (BISH), Swarbrick H-17 (BISH), Topping 3071 (UC, US)
Japan (offshore islands)
Ogasawara (Bonin) Islands
Bonin (Ogasawara) Islands introduced
Kato, Hidetoshi (2007)
As Gnaphalium pensylvanicum Willd.
New Caledonia
New Caledonia
New Caledonia Islands   Swarbrick, John T. (1997) (p. 92)
New Zealand (offshore islands)
Kermadec Islands
Raoul Island introduced
invasive
Webb, C. J./Sykes, W. R./Garnock-Jones, P. J. (1988) (p. 238)
As Gnaphalium pensylvanicum Willd. "Waste places, coastal sites, scrubland, local".
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
National Herbarium of New South Wales (2013)
Naturalised
Australia
Australia (continental)
Queensland introduced
invasive
National Herbarium of New South Wales (2013)
Naturalised
Central America
Central America (Pacific rim)
Costa Rica (Republic of) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Central America
Central America (Pacific rim)
Guatemala (Republic of) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Central America
Central America (Pacific rim)
Honduras (Republic of) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
China
China
China (People's Republic of) introduced
invasive
Zhengyi, Wu/Raven, Peter H./Deyuan, Hong (2013)
China
China
Hong Kong introduced
invasive
Wu, Te-lin (2001) (p. 282)
As Gnaphalium pensylvanicum Willd. In wasteland.
Japan
Japan
Japan (country) introduced
Mito, Toshikazu/Uesugi, Tetsuro (2004) (p. 190)
As Gnaphalium pensylvanicum Willd.
Mexico
Mexico
Mexico (United Mexican States) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Taiwan
Taiwan Island
Taiwan Island introduced
invasive
Zhengyi, Wu/Raven, Peter H./Deyuan, Hong (2013)
United States (west coast)
United States (west coast states)
USA (California) native
U.S. Dept. Agr., Nat. Res. Cons. Serv. (2013)
Indian Ocean
Country/Terr./St. &
Island group
Location Cited status &
Cited as invasive &
Cited as cultivated &
Cited as aboriginal introduction?
Reference &
Comments
La Réunion (France)
La Réunion Island
La Réunion Island introduced
invasive
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Naturalized
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., Nat. Res. Cons. Serv. (2013)
AL, DC, GA, HI, LA, MS, NC, OK, PA, SC, TX, VA
United States (continental except west coast)
United States (other states)
USA (Florida) native
U.S. Dept. Agr., Nat. Res. Cons. Serv. (2013)


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This page was created on 21 OCT 2002 and was last updated on 5 MAY 2013.