. Bulletin of the Department of Agriculture. Agriculture; Agriculture. 114 BULLETIN 112, U. S. DEPARTMENT OF AGRICULTURE. 49. AiRA L. {Deschampsia Beauv.) Spikelets 2-flowered, disarticulating above the glumes, the hairy rachilla prolonged behind the upper floret as a stipe, this sometimes ^1 ^ bearing a reduced floret; glumes about equal, acute or acutish, membranaceous; lemmas thin, truncate and 2 to 4 toothed at the summit, bearing a slender awn from or below the middle, the awn straight, bent, or twisted. Low or moderately tall annual or usually peren- nial grasses, with shining pale
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. 114 BULLETIN 112, U. S. DEPARTMENT OF AGRICULTURE. 49. AiRA L. {Deschampsia Beauv.) Spikelets 2-flowered, disarticulating above the glumes, the hairy rachilla prolonged behind the upper floret as a stipe, this sometimes ^1 ^ bearing a reduced floret; glumes about equal, acute or acutish, membranaceous; lemmas thin, truncate and 2 to 4 toothed at the summit, bearing a slender awn from or below the middle, the awn straight, bent, or twisted. Low or moderately tall annual or usually peren- nial grasses, with shining pale or purplish spikelets in narrow or open pani- cles. Species about 35, in the temperate and cool regions of both hemispheres, 6 of these being in the United States. Type species: Aira caespitosa L. Aira L., Sp. PI. 63, 1753; Gen. PI., ed. 5, 81. 1754. Fourteen species are described. The name was first used for a genus by Linnaeus in his Flora Lappouica in 1737, where lie describes four species. These four species are named in the Species Plantarum: 7. A. spicata, 8. A. caespitosa, 9. A. flexuosa, 10. A. montana. The first of these, A. spicata, is referred to Trisetum; the other three be- long to Deschampsia, as recognized in most American botanies. The genus Aii-a, as accepted by Bentham and Hooker in the Genera Plantarum and by Hackel in the Natiirlichen Pflanzenfamilien, is based upon the last two of the original Linnsean -Tall oat-grass, Arrhenatherum elatius. X 5. Plant, X J ; spikelet aod fertile floret,. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States. Dept. of Agriculture. [Washington, D. C. ?] : The Dept. : Supt. of Docs. , G. P. O.
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