. 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. Genus 82. GRASS FAMILY. 245 82. KOELERIA Pers. Syn. 1: 97. 1805. Tufted annual or perennial grasses, with flat or setaceous leaf-blades and mostly spike- like panicles. Spikelets 2-5-flowered. Two lower scales empty, narrow, acute, unequal, keeled, scarious on the margins; the flowering scales 3-5-nerved. Palet hyaline, acute, 2-keeled. Stamens 3. Styles very s
. 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. Genus 82. GRASS FAMILY. 245 82. KOELERIA Pers. Syn. 1: 97. 1805. Tufted annual or perennial grasses, with flat or setaceous leaf-blades and mostly spike- like panicles. Spikelets 2-5-flowered. Two lower scales empty, narrow, acute, unequal, keeled, scarious on the margins; the flowering scales 3-5-nerved. Palet hyaline, acute, 2-keeled. Stamens 3. Styles very short. Stigmas plumose. Grain free, enclosed in the scale and palet. [In honor of Georg Ludwig Koeler, German botanist.] About 15 species of wide geographic distribution. The following, which may contain two forms, occurs in North America. Type species: Poa nitida Lam. i. Koeleria cristata (L.) Pers. Koeler's- grass. Crested Hair-grass. Fig. 589. Aira cristata L. Sp. PI. 63. 1753. Koeleria cristata Pers. Syn. 1 : 97. 1805. Koeleria nitida Nutt. Gen. 1: 74. 1818. Koeleria cristata var. gracilis A. Gray, Man. 591. 1848. Culms i°-2i° tall, erect, simple, rigid, smooth, often pubescent just below the panicle. Sheaths often shorter than the internodes, smooth or sca- brous, sometimes hirsute; ligule i" long; blades I'-ia' long, 4"-i4" wide, erect, flat or involute, smooth or rough, often more or less hirsute; panicle l'-j' in length, pale green, usually contracted or spike-like, the branches erect or rarely ascending, 1' long or less; spikelets 2-5-flowered, 2"-$" long, the scales rough, acute, the empty ones unequal; flower- ing scales 1 $"-2" long, shining. In dry sandy soil, especially on prairies, Ontario to British Columbia, south to Pennsylvania, Texas and Cali- fornia. Also in Europe and Asia. Very variable. Prairie June-grass. 83. CATABROSA Beauv. Agrost. 97. pi. 19. f. 8. 1812. A perennial grass, with soft flat leaf-blades and
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