15 
awn bent and exserted beyond the spikelet; palet wanting.—Mountains of New Eng- 
land and southward; also of California, Oregon and Washington. 
Var. STOLONIFERA. Culms densely tufted and stoloniferous; leaves flat, 1 to 2 lines 
wide; lingule decurrent ; panicle sometimes denser or less open, sometimes pale green 
and thinner; empty glumes more unequal, very acute; floral glumes nearly equal to 
the spikelets; awn straight, little exserted beyond the longer glume.—Oregon (Hen- 
derson, Howell). 
11. A. Oregonensis Vasey. Bull. Torr. Club, x1. p. 55. Culms caespitose, not 
stoloniferous, about 2 feet high, somewhat slender; leaves mostly near the base, 
short and narrow, those of the culm shorter than the internodes, distant, narrow, 3 to 
4 inches long, slender pointed; panicle 4 to 5 inches long, purple, somewhat nod- 
ding; lower rays in threes to fives, 14 to 2 inches long, erect-spreading, naked below 
and rather numerously flowered at the extremities; spikelets on roughish pedicels 
one to three times as long, 1} lines long, narrowly lanceolate, acute; floral glume 
nearly as long as the outer, acutish, 5-nerved; palet wanting.—Oregon (Howell) 
and Washington (Suksdorf). Resembles 4. scabra, but has shorter panicle and rays, 
and usually a stouter culm. 
12. A. rupestris All. (Agrostis canina var. aipina Oakes.) (Gray’s Manual, 6th ed., 
p. 648.) Culms6 to 10 inches high, roots fibrous, caespitose, not stoloniferous; leaves all 
convolute-setaceous; panicle oval, purple or greenish; branches capillary, smooth ; 
mostly in twos or threes ; spikelets mostly near the extremity, less glomerate than in 4, 
alpina; empty glumes a little unequal, lanceolate, sharply acute; floral glume little 
shorter than the empty ones, rather obtuse, with 2small teeth at the summit, and 
awned a little below the middle; palet wanting.—Mountains of New England and 
North Carolina. Var. ruBRA. A small form occurring in Labrador and British Colum- 
bia is perhaps 4. rubra Linn, 
E. Panicle open, rays longer, spreading. 
13. A. geminata Trin. Icones Gram. 1. Pl. 28. Culms cespitose, about 8 inches 
high, erect or geniculate-ascending, thin filiform, smooth, the radical ones involute- 
filiform, 2 to 3 inches long, those of the culm plane, about 1 inch long; panicles 2 to 
3 inches long, diffuse, the axis filiform and flexuous, with 4 or 5 nodes, the rays 
mostly in pairs or the lower in threes or fours, dividing above the middle into several 
parts with divergent pedicels; empty glumes lanceolate, very acute, the lower a little 
the longer, floral glume one-fourth shorter, ovate-oblong, obtusish, indistinctly 
5-nerved, with an awn from about the middle which is a little longer thanits glume ; 
palet shorter than the ovary (or wanting).—Alaska, probably also in an uwnless 
form in British America and in the Rocky Mountains. 
14. A. arachnoides Ell. (Chapm. Flora S. States, p. 522.) Culms very weak and 
slender, 6 to 12 inches high; leaves very narrow to 1 or 2 lines wide; panicle very 
long for the size of the plant (one-half to two-thirds), at first contracted, becoming 
diffuse, the rays capillary, mostly in twos or threes, 1 to 3 inches long; empty glumes 
nearly equal, lanceolate, rough on the keel; floral glume nearly equaling its empty 
ones, apex obtuse, with 2 minute setaceous teeth, and emitting near the apex a very 
fine long awn, 5 or 6 times its own length, or the awn sometimes wanting; palet 
minute or wanting. —South Carolina, Tennessee, to Louisiana and Texas. 
15. A. scabra Willd. (Harr Grass) (Gray’s Manual, 6th ed. p. 648.) (4. oreophila 
Trin.) Culms very slender, erect, 1 to 2 feet high; leaves short and narrow, mostly 
involute or sometimes plane, the upper ones 1 to 3 inches long; panicle purplish, 6 to 
10 inches long, at first contracted, becoming very loose and spreading; rays capil- 
lary, often 3 or 4 inches long, the lower in clusters of 6 or more, branched above the 
middle, the subdivisions flowering near the summit; spikelets a line or more long, 
somewhat unequal, very acute, scabrous on the keel; floral glume shorter than the 
empty ones, very thin, sometimes short-awned; palet minute or wanting.—Very 
variable and widely diffused from the Atlantic to the Pacific. 
