GASTRIDIUM GRAMINE# 729 
CINNA 
the central one excurrent at or below the middle as a strong bent awn 1-2 
lines long: palet very small or none. Oregon to California. 
18 GASTRIDIUM Beauv. Agrost. 21. 
Panicle contracted into a somewhat loose tapering spike. 
Spikelets 1-flowered. Empty glumes with an enlarged ventricose 
shining base, very acute above, obscurely keeled, the lower longest. 
Flowering glume less than + as long as theempty ones, minutely 
hairy at base, very thin, truncate and dentate at the apex. Awn 
slender, arising just below the apex, equalling or exceeding the 
glumes, Palet equalling the flowering glume. Scales 2, linear, 
as long as the ovary. Stamens 3, Stigmas 2, subsessile, 
G. avusTRALe Beauv. |. c. Loosely cespitose: stems 6-24 inches high, 
smooth, branching at the lower nodes, geniculate below: sheaths shorter 
than the internodes, slightly roughened: ligules 2 lines long, lanceolate, 
fringed: leaves flat, 2-5 inches long. about 2 lines wide, scabrous on both 
sides, pale green: panicle 3-6 inches long, very pale green, shining with a 
satiny lustre; empty glumes about 2 lines long, very acute, slightly scab- 
rous above, shining below: flowering glume hairy. On prairies, southern 
Oregon to California: introduced from Europe. 
14 CINNA L. Sp. 5. 
Tall grasses with flat leaves and numerous spikelets in more or 
less open panicles. Panicles flexuous, with spreading or erect 
branches, Spikelets one-flowered, more or less flattened. Emp- 
ty glumes lanceolate, acute, one-nerved, the lower shortest, the 
upper equalling or slightly exceeding the flower. Flowering 
glume 3-nerved, acute and awnless, or bearing a short awn or 
seta just below the apex. Palet slightly shorter than the glume. 
Scales 2, very short. Stamens 1, 2 or 3. Ovary oblong,smooth. 
Styles 2, elongated. Stigmas plumose. Grain free, linear-oblong. 
C. pendula Trin. Mem. Acad. St. Petersb. vi, 280. Stems usually 
slender, erect, 2-6 feet high, smooth: sheaths shorter than the internodes, 
sometimes slightly scabrous: ligules 1-2 lines long: leaves 4-10 inches long, 
2-6 lines wide, scabrous: panicle 5-10 inches long, open, the capillary 
branches mostly spreading, flexuous and often drooping, the lower 2-5 
inches long: empty glumes 114 lines long, scabrous, acute, strongly hispid 
on the keel : flowering glumes shorter than the outer ones, bearing a rough 
awn 114 lines long from the 2-toothed apex. In wet places, California to 
Alaska and the Eastern States. | 
15 MUHLENBERGIA Schreb. Gen. 44. 
Mostly perennial grasses with flat or convolute leaves and pan- 
iculate inflorescence. Panicle contracted or open. Spikelets 
one-flowered, very rarely two-flowered. Empty glumes hyaline 
or membranous, acute, sometimes awned. Flowering glume 3-5- 
nerved, obtuse or acute, or often produced into a capillary awn. 
Palet 2-keeled. Stamens 2or3. Styles distinct, with plumose 
stigmas. Grain narrow, tightly enclosed in the glume. 
M. glomerata Trin. Unifl. 191. Stems 1-2 feet high, erect, usually 
much branched, smooth: sheaths smooth, those of the stem shorter than 
the internodes, those of the branches overlapping and often crowded: 
