Present on Pacific Islands?  yes

Primarily a threat at high elevations?  no

Common name(s): [more details]

Spanish: romero cimarrón, romero macho

Habit:  herb

Description:  "Erect, glabrous annual herbs 1-10 dm tall; stems usually diffusely branched in upper part, 6-anged.  Leaves stiff, linear or linear-elliptic, 1-7 cm long, 0.1-0.3 (-0.8) cm wide, lower surface with large glands, margins ± with 1 (3) pairs of stiff bristles near base, apex acute, sometimes the upper ones awn-tipped.  Heads solitary, peduncles filiform, 1-3 cm long; involucre subcylindrical, becoming narrowly funnelform, 4.5-7 mm long, the bracts (3-) 5 (6), maroon or purple-tinged, linear-oblong, involute, margins hyaline, apex hooded, prolonged and gibbous at base; rays yellow, drying white or purple, 2-4 mm long; disk florets1-6 per head, corollas yellow, drying white to purplish red, tubular-funnelform, 2-4 mm long; style branches subcapitate; pappus usually of 1-4 (5) flat, spreading, smooth awns 1.5-2.5 mm long, sometimes reduced to a partial crown.  Achenes black or dark brown, linear-clavate, longitudinally striate, ray achenes 3.5-5.5 mm long, disk achenes 3.5-4.5 mm long"  (Wagner et al., 1999; pp. 347, 349).

Habitat/ecology:  "A fairly common tropical weed" (Wiggins & Porter, 1971; pp. 346-347). In Hawai‘i, "apparently recently naturalized on lava fields, South Kona District, Hawai‘i" (Wagner et al., 1999; pp. 347, 349).

Propagation:  Seed

Native range:  "Native from Arizona, Mexico, western South America and the West Indies" (Wagner et al., 1999; pp. 347, 349).

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) Isabela Group	Isabela Island	possibly introduced invasive	Charles Darwin Foundation (2008)
Ecuador (Galápagos Islands) Isabela Group	Volcán Alcedo, Isabela Island	possibly introduced invasive	Charles Darwin Foundation (2008)
Ecuador (Galápagos Islands) Isabela Group	Volcán Darwin, Isabela Island	possibly introduced invasive	Charles Darwin Foundation (2008)
Ecuador (Galápagos Islands) Isabela Group	Volcán Sierra Negra, Isabela Island	possibly introduced invasive	Charles Darwin Foundation (2008)
Ecuador (Galápagos Islands) Pinta Group	Pinta Island	possibly introduced invasive	Charles Darwin Foundation (2008)
Ecuador (Galápagos Islands) San Cristóbal Group	San Cristóbal Island	possibly introduced invasive	Charles Darwin Foundation (2008)
Ecuador (Galápagos Islands) Santa Cruz Group	Plaza Sur Islet, Santa Cruz Island	possibly introduced invasive	Charles Darwin Foundation (2008)
Ecuador (Galápagos Islands) Santa Cruz Group	Santa Cruz Island	possibly introduced invasive	Charles Darwin Foundation (2008)
Ecuador (Galápagos Islands) Santa Cruz Group	Venecia Islet, Santa Cruz Island	possibly introduced invasive	Charles Darwin Foundation (2008)
Ecuador (Galápagos Islands) Santiago Group	Bartolomé Island	possibly introduced invasive	Charles Darwin Foundation (2008)
Ecuador (Galápagos Islands) Santiago Group	Rábida Island	possibly introduced invasive	Charles Darwin Foundation (2008)
Ecuador (Galápagos Islands) Santiago Group	Santiago Island	possibly 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) (pp. 347, 349) Voucher cited: Stemmermann 7124 (BISH)

Pacific Rim
Country/Terr./St. & Island group	Location	Cited status & Cited as invasive & Cited as cultivated & Cited as aboriginal introduction?	Reference & Comments
Colombia Colombia	Colombia (Republic of)	native	U.S. Dept. Agr., Agr. Res. Serv. (2011)
Ecuador (Mainland) Ecuador	Ecuador (Republic of) (continental)	native	U.S. Dept. Agr., Agr. Res. Serv. (2011)
Guatemala Guatemala	Guatemala (Republic of)	native	U.S. Dept. Agr., Agr. Res. Serv. (2011)
Mexico Mexico	Mexico (United Mexican States)	native	U.S. Dept. Agr., Agr. Res. Serv. (2011)
Perú Perú	Perú (Republic of)	native	U.S. Dept. Agr., Agr. Res. Serv. (2011)

Comments:  Probably not native to the Galápagos Islands, possibly introduced, per Charles Darwin Research Station.

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

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

Taxonomic information about Pectis linifolia 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.

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).

Wiggins, I. L./Porter, D. M. 1971. Flora of the Galapágos Islands. Stanford University Press. 998 pp.