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Project Name Data (Last Modified On 10/16/2012)

Flora Data (Last Modified On 10/16/2012)
PlaceOfPublication Sp. P1. 68. 1753.
Synonym 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.
Description 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.
Note 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.
Specimen CHIRIQUI: New Switzerland, central valley of Rio Chiriqui Viejo, Allen 1378.
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