Galinsoga quadriradiata Ruiz & Pav., Asteraceae

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Present on Pacific Islands?  yes

Primarily a threat at high elevations?  no

Other Latin names:  Galinsoga ciliata (Raf.) S. F. Blake

Common name(s): [more details]

English: hairy galinsoga, Peruvian daisy

Spanish: hierba de cuy

Habit:  herb

Description:  "Freely branching, pubescent annual herbs 2-7 dm tall; stems pubescent with usually fairly coarse and spreading hairs.  Leaves ovate to broadly ovate, 2.5-7 cm long, 1.5-5 cm wide, margins usually coarsely serrate or toothed.  Heads 3-4 mm high, peduncles spreading glandular villous; involucral bracts 2-3.3 mm long; ray florets (3) 5 (6) per head, rays white, rarely pink, 3-toothed, 1-2 mm long; pappus of ray florets consisting of short, fimbriate scales, that of disk florets consisting of awn-tipped, fimbriate scales.  Achenes pubescent with appressed or spreading hairs" (Wagner et al., 1999; p. 320).

Habitat/ecology:  In Hawai‘i, "relatively uncommon in low elevation, disturbed habitats, particularly urban areas and along roadsides" (Wagner et al., 1999; p. 320).  In Taiwan, "naturalized in the northern and central parts of the island along roadsides, in cultivated fields and at borders of disturbed forests and plantations, 200-1,300 m"  (Digital Flora of Taiwan).

Propagation:  Seed

Native range:  Central and South America (Wagner et al., 1999; p. 320).

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) Floreana Group	Floreana Island	introduced invasive	Charles Darwin Foundation (2008)
Ecuador (Galápagos Islands) Isabela Group	Isabela Island	introduced invasive	Charles Darwin Foundation (2008)
Ecuador (Galápagos Islands) Isabela Group	Volcán Sierra Negra, Isabela Island	introduced invasive	Charles Darwin Foundation (2008)
Ecuador (Galápagos Islands) San Cristóbal Group	San Cristóbal Island	introduced invasive	Charles Darwin Foundation (2008) Collected in survey, herbarium record pending.
Ecuador (Galápagos Islands) Santa Cruz Group	Santa Cruz 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. 320)
State of Hawaii Hawaiian Islands	Maui Island	introduced invasive	Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (p. 320)
State of Hawaii Hawaiian Islands	Moloka‘i Island	introduced invasive	Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (p. 320)
State of Hawaii Hawaiian Islands	O‘ahu Island	introduced invasive	Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (p. 320) Voucher cited: Baker 78
Japan (offshore islands) Bonin (Ogasawara) Islands	Bonin (Ogasawara) Islands	introduced	Kato, Hidetoshi (2007)

Pacific Rim
Country/Terr./St. & Island group	Location	Cited status & Cited as invasive & Cited as cultivated & Cited as aboriginal introduction?	Reference & Comments
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. (2011)
Taiwan Taiwan	Taiwan Island	introduced invasive	Ching-I Peng, ed. (2011)

Additional information:
Additional online information about Galinsoga quadriradiata is available from the Hawaiian Ecosystems at Risk project (HEAR).

Information about Galinsoga quadriradiata as a weed (worldwide references) may be available from the Global Compendium of Weeds (GCW).

Taxonomic information about Galinsoga quadriradiata may be available from the Germplasm Resources Information Network (GRIN).

References:

Charles Darwin Foundation. 2008. Database inventory of introduced plant species in the rural and urban zones of Galapagos. Charles Darwin Foundation, Galapagos, Ecuador.

Charles Darwin Research Station. 2005. CDRS Herbarium records.

Ching-I Peng, ed. 2011. Digital flora of Taiwan (online resource).

Kato, Hidetoshi. 2007. Herbarium records of Makino Herbarium, Tokyo Metropolitan University. Personal communication.

Mito, Toshikazu/Uesugi, Tetsuro. 2004. Invasive alien species in Japan: the status quo and the new regulation for prevention of their adverse effects. Global Environmental Research 8(2)/2004: 171-191.

U.S. Dept. Agr., Agr. Res. Serv. 2011. National Genetic Resources Program. Germplasm Resources Information Network (GRIN). Online searchable database.

Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. 1999. Manual of the flowering plants of Hawaii. Revised edition. Bernice P. Bishop Museum special publication. University of Hawai‘i Press/Bishop Museum Press, Honolulu. 1919 pp. (two volumes).