Pacific Island Ecosystems at Risk (PIER)

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Verbesina encelioides
(Cav.) Benth. & Hook., Asteraceae
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Present on Pacific Islands?  yes

Primarily a threat at high elevations?  no

Risk assessment results:  High risk, score: 19 (Go to the risk assessment)

Common name(s): [more details]

English: American dogweed, butter daisy, crown-beard, golden crown-beard, South African daisy

Habit:  herb

Description:  "Taprooted annual herbs; stems 2-10 dm long, many-branched.  Leaves opposite, upper ones alternate, ovate or deltate, 4-15 cm long, 2-10 cm wide, both surfaces canescent-strigoese, sometimes less so on upper surface4, margins coarsely and often irregularly serrate, petioles dilated at base to form a pair of stipule-like auricles.  Heads solitary at the ends of long peduncles or in clusters of 2-3, radiate; involucral bracts ca. 15, green, subequal, linear, 7-15 mm long; ray florets 10-15 per head, pistillate, rays bright yellow, 10-25 mm long; disk florets numerous, corollas yellow, ca. 8 mm long.  Achenes winged"  (Wagner et al., 1999; p. 372).

Habitat/ecology:  In Hawai‘i, "naturalized and relatively common in dry, disturbed sites, 0-2,805 m"  (Wagner et al., 1999; p. 372).

Propagation:  Seed

Native range:  "Mexico and southwestern United States"  (Wagner et al., 1999; p. 372).

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. 372)
State of Hawaii
Hawaiian Islands
Kaho‘olawe Island introduced
invasive
Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (p. 372)
State of Hawaii
Hawaiian Islands
Kaua‘i Island introduced
invasive
Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (p. 372)
State of Hawaii
Hawaiian Islands
Kure Atoll introduced
invasive
Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (p. 372)
State of Hawaii
Hawaiian Islands
Kure Atoll introduced
invasive
Starr, Forest/Martz, Kim/Loope, Lloyd (2001) (p. 18)
Common and widespread over almost the entire island, especially the interior of the island. Both seabirds and native plants have been displaced by this highly invasive plant. Not much grows under the dense, shady dog hair thickets, except occasionally Boerhavia repens and a few others in light gaps and edges.
State of Hawaii
Hawaiian Islands
Lāna‘i Island introduced
invasive
Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (p. 372)
State of Hawaii
Hawaiian Islands
Maui Island introduced
invasive
Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (p. 372)
State of Hawaii
Hawaiian Islands
Moloka‘i Island introduced
invasive
Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (p. 372)
State of Hawaii
Hawaiian Islands
Ni‘ihau Island introduced
invasive
Wood, K. R./LeGrande, Maya (2006) (p. 21)
Voucher cited: K.R. Wood & VanderWerf 9878 (BISH, PTBG)
State of Hawaii
Hawaiian Islands
O‘ahu Island introduced
invasive
Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (p. 372)
State of Hawaii
Hawaiian Islands
Pearl and Hermes Reef introduced
invasive
Starr, Forest/Martz, Kim/Loope, Lloyd L. (2002) (p. 18)
Voucher cited: Starr & Martz 990614-1 (BISH)
State of Hawaii
Hawaiian Islands
Pearl and Hermes Reef introduced
invasive
Starr, Forest/Martz, Kim (1999) (p. 21)
Southeast Island: A common to dominant species found on the eastern side of the lagoon. A few large patches and some smaller ones.
United States (other Pacific offshore islands)
Midway Atoll
Eastern Island introduced
invasive
Starr, Forest/Starr, Kim/Loope, Lloyd (2008) (pp. B-15)
United States (other Pacific offshore islands)
Midway Atoll
Midway Atoll introduced
invasive
Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (p. 372)
United States (other Pacific offshore islands)
Midway Atoll
Sand Island introduced
invasive
Starr, Forest/Starr, Kim/Loope, Lloyd (2008) (pp. B-15)
United States (other Pacific offshore islands)
Midway Atoll
Spit Island introduced
invasive
Starr, Forest/Starr, Kim/Loope, Lloyd (2008) (pp. B-15)
Pacific Rim
Country/Terr./St. &
Island group
Location Cited status &
Cited as invasive &
Cited as cultivated &
Cited as aboriginal introduction?
Reference &
Comments
Mexico
Mexico
Mexico (United Mexican States) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
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) 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)

Comments:  A dominant invasive on Midway Atoll (Starr, Starr & Loope, 2008; p. A-56).


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This page was created on 28 JAN 2010 and was last updated on 28 AUG 2010.