Pacific Island Ecosystems at Risk (PIER)

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Porophyllum ruderale subsp. macrocephalum
(DC.) R. R. Johnson, Asteraceae
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Present on Pacific Islands?  yes

Primarily a threat at high elevations?  no

Other Latin names:  Porophyllum macrocephalum DC.

Common name(s): [more details]

English: poreleaf

Spanish: ruda gallinazo, yerba porosa

Habit:  herb

Description:  "Erect, subsimple to freely branched, malodorous annual, 2-10 dm tall, conspicuously blue-glaucous throughout; blades thin, narrowly to more often broadly elliptic, obtuse or rounded to somewhat acute at both ends, broadly and shallowly undulate-toothed, commonly with prominent oil gland 1-1.5 mm long associated with each sinus, mostly 1.5-4 cm long, 0.5-2.5 cm wide on well-developed, slender petiole often nearly or fully as long; heads erect, terminating the branches, on clavate peduncles mostly 3-10 cm long; involucre cylindric at anthesis, its 5 or 6 bracts narrow and elongate, mostly 17-21 mm long, persistent and becoming reflexed in age; disk dark, only about 6-7 mm wide at anthesis; flowers more or less numerous, from about 21 to more than 65; corolla about 1 cm long, the very slender, pale tube many times longer than the very short, purple throat; corolla about 1 cm long, the very slender, pale tube many times longer than the very short, purple throat; corolla lobes about 1 mm long or a bit more, equaling or longer than throat, purple or greenish; achenes 9-13 mm long, with prominent, smooth, shining, pale, callous base; pappus sordid or brownish, nearly or fully 1 cm long"  (Wiggins & Porter, 1971; pp. 349-351).

Habitat/ecology:  "A weed in disturbed soil" (Wiggins & Porter, 1971; pp. 349-351). Arid lowlands in the Galápagos Islands (McMullen, 1999; p. 217).

Propagation:  Seed

Native range:  United States, Mexico, Central and South America (GRIN).

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)
Española Group
Española Island introduced
invasive
Charles Darwin Foundation (2008)
Ecuador (Galápagos Islands)
Española Group
Gardner por Espaņola Islet, Española Island introduced
invasive
Charles Darwin Foundation (2008)
Ecuador (Galápagos Islands)
Española Group
Oeste Islet, Española Island introduced
invasive
Charles Darwin Foundation (2008)
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 Alcedo, Isabela Island introduced
invasive
Charles Darwin Foundation (2008)
Ecuador (Galápagos Islands)
Isabela Group
Volcán Darwin, Isabela Island introduced
invasive
Charles Darwin Foundation (2008)
Ecuador (Galápagos Islands)
Isabela Group
Volcán Sierra Negra, Isabela Island introduced
invasive
Charles Darwin Foundation (2008)
ssp. macrocephalum
Ecuador (Galápagos Islands)
Isabela Group
Volcán Wolf, Isabela Island introduced
invasive
Charles Darwin Foundation (2008)
Ecuador (Galápagos Islands)
Pinta Group
Pinta Island introduced
invasive
Charles Darwin Foundation (2008)
Ecuador (Galápagos Islands)
Pinzón Group
Pinzón Island introduced
invasive
Charles Darwin Foundation (2008)
Ecuador (Galápagos Islands)
San Cristóbal Group
San Cristóbal Island introduced
invasive
Charles Darwin Foundation (2008)
Ecuador (Galápagos Islands)
Santa Cruz Group
Daphne Mayor Island, Santa Cruz Island introduced
invasive
Charles Darwin Foundation (2008)
Ecuador (Galápagos Islands)
Santa Cruz Group
Edeén Island introduced
invasive
Charles Darwin Foundation (2008)
Ecuador (Galápagos Islands)
Santa Cruz Group
Santa Cruz Island introduced
invasive
Charles Darwin Foundation (2008)
Ecuador (Galápagos Islands)
Santa Cruz Group
Seymour Norte Island introduced
invasive
Charles Darwin Foundation (2008)
Ecuador (Galápagos Islands)
Santiago Group
Rábida Island introduced
invasive
Charles Darwin Foundation (2008)
Ecuador (Galápagos Islands)
Santiago Group
Santiago Island introduced
invasive
Charles Darwin Foundation (2008)
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. (2013)
Costa Rica
Costa Rica
Costa Rica (Republic of) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Ecuador (Mainland)
Ecuador
Ecuador (Republic of) (continental) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Including Galapagos.
Guatemala
Guatemala
Guatemala (Republic of) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Honduras
Honduras
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)
Panama
Panama
Panama (Republic of) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Perú
Perú
Perú (Republic of) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Singapore
Singapore
Singapore (Republic of) introduced
invasive
Chong, Kwek Yan/Tan, Hugh T. W./Corlett, Richard T. (2009) (p. 72)
Naturalised
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)


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This page was created on 23 JUN 2004 and was last updated on 24 MAR 2007.