Bidens cynapiifolia Kunth, Asteraceae

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Present on Pacific Islands?  yes

Primarily a threat at high elevations?  no

Common name(s): [more details]

English: beggar-ticks

Spanish: alfilerillo, manzanilla negra, margarita blanca

Habit:  herb

Description:  "Erect annual herbs 0.2-2 m tall. Leaves pinnately to bipinnately compound to tripinnatifid, usually 3-12 cm long including petiole.  Heads 3-8 or more in simple or compound cymes terminating main stem and lateral branches, 0.4-0.8 cm in diameter, discoid or radiate and slightly wider peduncles 2-9 (-15) cm long in flower, lengthening in fruit; outer involucral bracts linear, 4-6 (-7) mm long; ray florets absent or 3-4 per head, rays yellow, 5-7.5 mm long; disk florets ca. 25 per head, perfect; pappus of 4-6 barbed awns 2-3 mm long.  Achenes dark brown, straight or curved outward, linear and more or less quadrangular, longitudinally grooved, wingless, 8-17 mm long, setose"  (Wagner et al., 1999; p. 274).

Habitat/ecology:  In Hawai‘i, "naturalized in dry areas" (Wagner et al., 1999; p. 274).

Propagation:  Seed

Native range:  West Indies and tropical America (Wagner et al., 1999; p. 274).

Presence:

Pacific
Country/Terr./St. & Island group	Location	Cited status & Cited as invasive & Cited as cultivated & Cited as aboriginal introduction?	Reference & Comments
Ecuador (Galápagos Islands) San Cristóbal Group	San Cristóbal Island	introduced invasive	Charles Darwin Foundation (2008)
State of Hawaii Hawaiian Islands	Hawai‘i (Big) Island	introduced invasive	Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (p. 274)
State of Hawaii Hawaiian Islands	Kaua‘i Island	introduced invasive	Lorence, David H./Flynn, Timothy W./Wagner, Warren L. (1995) (p. 23) Voucher ctied: T. Flynn et al. 2707 (PTBG)
State of Hawaii Hawaiian Islands	Lāna‘i Island	introduced invasive	Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (p. 274)
State of Hawaii Hawaiian Islands	Maui Island	introduced invasive	Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (p. 274)
State of Hawaii Hawaiian Islands	Moloka‘i Island	introduced invasive	Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (p. 274)
State of Hawaii Hawaiian Islands	O‘ahu Island	introduced invasive	Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (p. 274)

Pacific Rim
Country/Terr./St. & Island group	Location	Cited status & Cited as invasive & Cited as cultivated & Cited as aboriginal introduction?	Reference & Comments
Central America Central America (Pacific rim)	Nicaragua (Republic of)	native	U.S. Dept. Agr., Agr. Res. Serv. (2013)
Central America Central America (Pacific rim)	Panama (Republic of)	native	U.S. Dept. Agr., Agr. Res. Serv. (2013)
Mexico Mexico	Mexico (United Mexican States)	native	U.S. Dept. Agr., Agr. Res. Serv. (2013) Yucutan
South America (Pacific rim) South America (Pacific rim)	Colombia	native	U.S. Dept. Agr., Agr. Res. Serv. (2013)
South America (Pacific rim) South America (Pacific rim)	Ecuador (Republic of) (continental)	native	U.S. Dept. Agr., Agr. Res. Serv. (2013)
South America (Pacific rim) South America (Pacific rim)	Ecuador (Republic of) (continental)	native	Missouri Botanical Garden (2013)
South America (Pacific rim) South America (Pacific rim)	Perú (Republic of)	native	U.S. Dept. Agr., Agr. Res. Serv. (2013)

Comments:  Probably not native to the Galápagos Islands.

Control:  If you know of control methods for Bidens cynapiifolia, please let us know.