. An illustrated flora of the northern United States, Canada and the British possessions, from Newfoundland to the parallel of the southern boundary of Virginia, and from the Atlantic Ocean westward to the 102d meridian. Botany; Botany. 3. Deschampsia atropurpurea (Wahl.) Scheele. Mountain Hair-grass. Fig. 522. Aira atropurpurea Wahl. Fl. Lapp. 37. 1812. D. atropurpurea Scheele, Flora 27: 56. 1844. Glabrous and smooth or very nearly so, culms 6'-i8' tall, erect, simple, rigid. Sheaths shorter than the internodes; ligule 1" long or less, truncate; blades i"-2" wide, erect, someti
. An illustrated flora of the northern United States, Canada and the British possessions, from Newfoundland to the parallel of the southern boundary of Virginia, and from the Atlantic Ocean westward to the 102d meridian. Botany; Botany. 3. Deschampsia atropurpurea (Wahl.) Scheele. Mountain Hair-grass. Fig. 522. Aira atropurpurea Wahl. Fl. Lapp. 37. 1812. D. atropurpurea Scheele, Flora 27: 56. 1844. Glabrous and smooth or very nearly so, culms 6'-i8' tall, erect, simple, rigid. Sheaths shorter than the internodes; ligule 1" long or less, truncate; blades i"-2" wide, erect, sometimes slightly scabrous above, the basal 2Y-S' long, those of the culm shorter; panicle contracted, usually purple or pur- plish, 1/-2' in length, the branches erect, or some- times ascending, the lower i'-ii' long; spikelets 2\" long; flowering scales about \\" long, erose-truncate at the apex; awns bent and much longer than the scales; upper scale much exceeded by the very acute outer ones. On alpine summits, from New England to Colorado and Oregon, north to Labrador and Alaska. Also in Europe. July-Aug. 52. TRISETUM Pers. Syn. i: 97 Mostly perennial tufted grasses, with flat leaf-blades and spike-like or open panicles. Spikelets 2-4-flowered, the flowers all perfect, or the uppermost staminate; rachilla glabrous or pilose, extended beyond the flowers. Scales 4-6, membranous, the 2 lower empty, unequal, acute, persistent; flowering scales usually shorter than the empty ones, deciduous, 2-toothed, bearing a dorsal awn below the apex, or the lower one sometimes awnless. Palet narrow, hyaline, 2-toothed. Stamens 3. Styles distinct. Stigmas plumose. Grain free, enclosed in the scale. [Latin, referring to the three bristles (one awn and two sharp teeth) of the flow- ering scales in some species.] About 60 species, widely distributed in temperate or mountainous regions. Besides the follow- ing, about 8 others occur in the western parts of North America. Type species: Avena
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1913
