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(Last Modified On 10/16/2012)
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(Last Modified On 10/16/2012)
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Species
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POA ANNUA
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PlaceOfPublication
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Sp. P1. 68. 1753.
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Synonym
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Aira pumila Pursh, Fl. Amer. Sept. 1:76. 1814. Poa infirma H.B.K. Nov. Gen. & Sp. 1:158. 1816. Megastachya infirma Roem. & Schult. Syst. Veg. 2:585. 1817. Catabrosa pumila Roem. & Schult. Syst. Veg. 2:696. 1817. Poa aestivalis Presl, Rel. Haenk. 1:272. 1830. Eragrostis infirma Steud. Nom. Bot. ed. 2. 1:563. 1840. Poa annua var. rigidiuscula L. H. Dewey, Contr. U. S. Nat. Herb. 3:262. 1895.
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Description
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Soft, erect or decumbent-spreading annual; culms flattened, commonly 5-20 cm. high, glabrous; sheaths thin with hyaline margins, mostly longer than the internodes; ligule hyaline, about 5 mm. long; blades flat, mostly 5-10 cm. long, 1-3 mm. wide, the margins scabrous; panicle 3-10 cm. long, open with rather short ascending to spreading branches; spikelets short-pedicelled, crowded, 3- to 6-flowered; first glume 1.5-2 mm., the second 2-2.5 mm. long; lemmas about 3 mm. long, subobtuse, distinctly nerved, densely pubescent on the nerves, not webbed at the base.
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Note
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Open ground and waste places, in cool or temperate regions. Introduced in America from Europe, occurring from Labrador to Alaska southward throughout the United States; also in tropical America at higher altitudes. Annual blue-grass.
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Specimen
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CHIRIQUI: New Switzerland, central valley of Rio Chiriqui Viejo, Allen 1378.
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Tag
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Project Name
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