Calyptocarpus vialis Less., Asteraceae

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Present on Pacific Islands?  yes

Primarily a threat at high elevations?  no

Common name(s): [more details]

Chinese: jin yao jian jiu

English: calyptocarpus, creeping Cinderella-weed, straggler daisy

Spanish: hierba de caballo

Habit:  herb

Description:  "Herbaceous perennials. Stems prostrate, many from base, rooting at nodes, densely appressed strigillose. Leaves ovate to broadly ovate, to 35 x 25 mm, densely appressed strigillose on both surfaces, hirtellous especially on lower surface, apex acute, apiculate, margins crenate-serrate, base attenuate; petiole 3-8 mm long, narrowly winged toward blade, ciliate along margins. Heads axillary, solitary, subsessile, peduncle occasionally to 15 mm long. Involucre narrowly oblong-oblanceoloid, 6-7 x 2.5-3.5 mm. Involucral bracts 4, concave, lanceolate, acuminate and apiculate, entire, 6-7 x 3-3.5 mm, glabrous within, strigillose without, in 2 series. Paleae hyaline, narrowly elliptic, 3.5-4.8 x 0.8-1 mm. Ray florets 3-7 (-8), yellow; corolla 4.5-6.2 x 1.4-1.8 mm; achenes oblanceolate, 3.5-4 mm x 1.7-2 mm, tan to blackish, flattened, with small lateral wing-like projections, pappus of usually 2 ascending-divergent awns, 1.2-2.4 mm long. Disc florets 3-7 (-8); corolla 2.6-3.6 mm long, densely papillose within; anthers black, 1 mm long, apical appendages lanceolate, obtuse; achenes similar to those of ray florets but slightly narrower and thicker, sometimes 3-angled, 1.1-1.7 mm across, evidently muricate"  (Digital Flora of Taiwan).

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

Habitat/ecology:  In Hawai‘i, "a weed of disturbed habitats, especially lawns, often forming a dense ground cover" (Wagner et al., 1999; p. 284).

Propagation:  Seed

Native range:  "Texas south to Guatemala, Costa Rica, and Cuba" (Wagner et al., 1999; p. 284).

Presence:

Pacific
Country/Terr./St. & Island group	Location	Cited status & Cited as invasive & Cited as cultivated & Cited as aboriginal introduction?	Reference & Comments
Guam Guam Island	Guam Island	introduced	Raulerson, L. (2006) (p. 67)
State of Hawaii Hawaiian Islands	Hawai‘i (Big) Island	introduced invasive	Oppenheimer, Hank (2007) (p. 20) Voucher cited: Oppenheimer H40508 (BISH, PTBG)
State of Hawaii Hawaiian Islands	Kaho‘olawe Island	introduced invasive	Oppenheimer, Hank L. (2006) (pp. 10-11) Voucher cited: Oppenheimer, G. Hanse & J. Bruch H10402 (BISH, PTBG)
State of Hawaii Hawaiian Islands	Kaua‘i Island	introduced invasive	Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (p. 284)
State of Hawaii Hawaiian Islands	Lāna‘i Island	introduced invasive	Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (p. 284)
State of Hawaii Hawaiian Islands	Maui Island	introduced invasive	Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (p. 284)
State of Hawaii Hawaiian Islands	Moloka‘i Island	introduced invasive	Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (p. 284)
State of Hawaii Hawaiian Islands	O‘ahu Island	introduced invasive	Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (p. 284) Voucher cited: Fosberg 44449 (US)
Kiribati Tungaru (Gilbert) Islands	Tarawa Atoll	introduced invasive	Space, James C./Imada, Clyde T. (2004) (p. 73) Voucher: Imada 2003-26 (BISH 697641)
United States (other Pacific offshore islands) Midway Atoll	Midway Atoll	introduced invasive	Bruegmann, Marie M. (1999) (p. 1) Voucher cited: Bruegmann 2019 (BISH) Rare
United States (other Pacific offshore islands) Midway Atoll	Sand Island	introduced invasive	Starr, Forest/Starr, Kim/Loope, Lloyd (2008) (pp. B-5)

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)	Queensland	introduced invasive	U.S. Dept. Agr., Agr. Res. Serv. (2013) Naturalized
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)	El Salvador (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)
Mexico Mexico	Mexico (United Mexican States)	native	U.S. Dept. Agr., Agr. Res. Serv. (2013)
Taiwan Taiwan Island	Taiwan Island	introduced invasive	Ching-I Peng, ed. (2013) A weed of roadsides; sometimes cultivated as a ground cover on traffic islands.

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) Alabama, Louisiana, Mississippi, Texas
United States (continental except west coast) United States (other states)	USA (Florida)	native	U.S. Dept. Agr., Agr. Res. Serv. (2013)

Control:  If you know of control methods for Calyptocarpus vialis, please let us know.