Pacific Island Ecosystems at Risk (PIER)

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Axonopus micay
García-Barr, Poaceae
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Present on Pacific Islands?  yes

Primarily a threat at high elevations?  no

Common name(s): [more details]

Spanish: micay, pasto micael, pasto micay

Habit:  grass

Description:  "Perennials growing in tufts or stoloniferous. Stems up to  150 cm x 4-8 mm, erect or decumbent and rooting, sparingly branched; nodes and internodes glabrous. Leaves cauline; sheath generally glabrous, rarely hairy, sometimes with a marginal fringe of hairs; collar frequently hairy at times glabrous; ligule 0.5-0.9 mm, fringed with hairs; leaves 15-38 cm x 12-18 mm, glabrous below, glabrous or sparsely hairy above, and fringed with hairs to the base, the apex is obtuse. Inflorescences 1-2, 10-12 cm, terminal and axillary; racemes 3-24, 6-16 cm, grow obliquely upwards, inferior racemes frequently branched, central axis of the inflorescence 0.4-0.7 mm wide, triquetrous, marginally scabrous and at times with elongated trichomes. Spikelets 2.2-2.8 mm, sparsely hairy; glume superior and lemma inferior 4-nerved adpressed hairs in the margins; floret superior equal length to the spikelet or up to 0.2 mm shorter, straw colored, apex is sparsely puberulent; anthers 1-1.5 mm."

"Black (1963) considered this to be a prostrate form of Axonopus scoparius. Despite these similarities the differences were sufficient to distinguish two species" (Pohl & Davidse, 1994). [translation provided by Chris Buddenhagen].

Spanish:  "Perennes cespitosas o estoloniferas.  Tallos hasta 150 cm x 4-8 mm, erectos o largamente decumbentes y enraizando, esparcidamente ramificados; entrenudos y nudos glabros.  Hojas principalmente caulinares; vainas generalmente glabras, raramente pilosas, a veces ciliadas; cuello frecuentemente peloso o a veces glabro; ligula 0.5-0.9 mm, ciliolada; láminas 15-38 cm x 12-18 mm, glabras en el envés, blabras o esparcidamente pilosas en el haz, ciliadas hacia la base, el ápice obtuso. Inflorescencias 1-2, 10-12 cm, terminales y axilares; racimos 3-24, 6-16 cm, ascendentes, los inferiores frecuentemente ramificados, el raquis 0.4-0.7 mm de ancho, triquetro, marginalmente escabroso y a veces con unos cuantos tricomas alargados. Espiguillas 2.2-2.8 mm, esparcidamente pelosas; gluma superior y lema inferior 4-nervias, adpreso pelosas en los márgenes; flósculo superior tan largo como la espiguilla o hasta 0.2 mm más corto que ella, pajizo, el ápice esparcidamente puberulento; anteras 1-1.5 mm."

"Black (1963) considera a esta especie como una forma rastrera de Axonopus scoparius. A pesar de que indudablemente ambos taxa están cercanamente emparentado, los caracteres empleados para separar a estas especies son de la misma magnitud de aquellos usados para reconocer numerosos pares de especies cercanas en el género" (Pohl & Davidse, 1994; p. 358).

Description from GrassBase.

Habitat/ecology:  "Cultivated for forage, along trails. 0-2200 m." (Pohl & Davidse, 1994).
"Pasto cultivado para forraje, orillas de caminos. 0-2200 m." (Pohl & Davidse, 1994; p. 358).

Propagation:  Seed

Native range:  "Colombia and Venezuela; introduced in Central America and other parts of South America, at least into Ecuador" (Pohl & Davidse, 1994).
"Colombia y O. Venezuela; introducia en Mesoamérica y en otras partes de Sudamérica, al menos hasta Ecuador" (Pohl & Davidse, 1994; p. 358).

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 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)
Ecuador (Galápagos Islands)
Santa Cruz Group
Santa Cruz 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)


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This page was created on 13 JUN 2004 and was last updated on 30 NOV 2008.