Pacific Island Ecosystems at Risk (PIER)

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Pectis linifolia
L., Asteraceae
No images for this taxon


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
Central America
Central America (Pacific rim)
Guatemala (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)
South America (Pacific rim)
South America (Pacific rim)
Colombia (Republic of) native
U.S. Dept. Agr., Agr. Res. Serv. (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, possibly introduced, per Charles Darwin Research Station.


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This page was created on 6 JUL 2004 and was last updated on 20 OCT 2006.