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to 24 feet high, leaves much larger, panicle 3 to 6 inches long, varying from dense 
and glomerate to loosely subspicate, the awned point of the empty glumes sometimes 
larger than the body, resembling a Polypogon. It is surely not A, exarata.—With 
the same range as the typical form. 
3, A. exarata Trin. (Bot. Cal. um. p. 273.) (Agrostis albicans Buckl.) Culms 
erect, 1 or 2 feet high or more, from an annual (or perennial?) root, at length naked 
for some distance below the panicle; leaves mostly erect and flat, 1 to 3 lines broad, 
2 to 6 or 8 inches long, the lower generally shorter, smoothish to very rough, ligule 
obtuse; sheaths mostly shorter than the internodes, smooth ; panicle erect or nod- 
ding, narrow and dense, to open and thin, often somewhat lobed, rays verticillate 
and very numerous to few, of unequal length, mostly flower-bearing to the base ; 
spikelets 1 to 2 lines long; glumes nearly equal, acute, rough on the keel; floral glume 
one-third to one-half shorter than the empty ones, usually 4- or 5-nerved, usually 
unawned, soraetimes the midnerve does not extend to the apex and terminates with 
a short awn; palet usually shorter than the ovary or wanting; stamens 3.—Ex- 
tending in some form throughout the Rocky Mountain region to the Pacific, and 
eastward to Wisconsin. 
One of the most variable species. Different forms have received several names, 
including Agrostis grandis Trin., A. asperifolia Trin., and 4. pallens Trin. Agrostis 
microphylla Steudel has also been referred to it as a variety, but I think it is a good 
species. 
B. Panicle loose, rather narrow, rays erect. 
4. A.varians Trin. (Bot. Cal. 1. p. 273.) Culms slender, erect, from a peren- 
nial root, smooth, 6 to 12 inches high; leaves very narrow ; one-half to 1 line wide, 
1 to 3 inches long; sheaths mostly longer than internodes; panicle 1 to 3 inches long, 
purplish, the rays erect, the lower numerous, about an inch long, flowering above 
the middle or lower; spikelets a line long or less; empty glumes nearly equal, acute, 
smooth, or nearly so; palet minute or wanting.—Rocky Mountains to the Sierras. 
Probably this includes 2 or 3 species. 
5. A. tenuis Vasey. Bull. Torr. Club, x. p. 21, Perennial, loosely tufted; culms 
6 to 12 inches high, slender leaves numerous at the base, 1 to 2 inches long, narrow 
(4 line), with 2 to 3 on the culm; ligule short, obtuse, lower sheaths about equal to 
the ligule; panicle pyramidal, open, 2 to 3 inches long, the rays in three or fives 
below, above in twos or single; capillary, the longest 1 inch or more in length, 
becoming spreading, naked below the middle, above subdivided and few flowered ; 
spikelets very small (less than a line), purplish, empty glumes rather unequal, acute, 
smoothish; foral glume thin, a little shorter than the outer, obtusish, 3-nerved above, 
unawned; palet very minute or wanting.—From southern California to Oregon, on 
mountains. 
C. Panicle larger, rays longer, but still erect. 
6. A. Scouleri Trin.? (Bot. Cal. 1. p.272). (4. repens Scribn.) Culms perennial 
from running root-stocks, 14 to 24 feet high, erect 4 or 5 nodes above the base; 
leaves 4 to 6 inches long, flat or becoming involute; sheaths about as long as the 
internodes; ligule 1 to 2 lines long, acute ; panicle 3 to 5 inches long, lanceolate 
or linear-lanceolate ; rays mostly in fives, unequal, the longer 1 inch or more long, 
naked below, the shorter ones flowering to the base; empty glumes somewhat un- 
equal, 1} to 1} lines long, acute, smooth except the midrib; floral glumes nearly as 
long, oblong, acute or acutish, with 5 prominent nerves, the midrib sometimes end- 
ing above the middle in a slender awn; no palet.—-California to Alaska. 
This is coaspicuously distinguished by its running rootstocks, which are not men- 
tioned in the original description, whereas Trinius describes 4. pallens as being sub- 
repent and stoloniferous. There is great uncertainty about the names of western 
species of Agrostis, 
