774 GRAMINEA : LOLIUM 
AGROPYRON 
empty in the lateral spikelets and the two lower ones empty in 
the terminal one: flowering glumes rounded on the back, 5-7- 
nerved: palets 2-keeled. Stamens3. Styles distinct, very short, 
with plumose stigmas. Grain adherent to the palets. 
L. PERENNE L. Sp. 83. Stems 6-30 inches high, erect, simple, smooth, 
from a perennial root: sheaths shorter than the internodes: ligules very 
short: leaves 2-5 inches long: 1-2 lines wide, spike 5-8 inches long: spike- 
' lets 5-10 flowered, 4-6 lines long, empty glumes shorter than the spikelets, 
strongly nerved ; flowering glumes 2-3 lines long, obscurely nerved, acumin- 
ate or awned, the awn sometimes nearly as long as the glume. Common 
in waste places: naturalized from Europe. 
L. TemMuULENTUM L, Sp. 83. Glabrous throughout: stems 2-4 feet high, 
erect, simple, from an annual root: sheaths longer than the internodes: 
ligules a line long or less: leaves 4-10 inches long, 1-3 lines wide, smooth 
beneath, rough above: spike 4-12 inches long: spikelets 4-8-flowered, 5-9 
lines long, the strongly nerved empty glumes equalling or exceeding the 
‘obscurely nerved flowering ones. In fields: naturalized from Europe. 
52 AGROPYRON J. Gertn. Nov. Comm. Petrop. xiv, pt. 1, 539. 
_ Annual or perennial grasses with flat or involute leaves and 
terminal spikes. Spikelets 3- to several-flowered, sessile, solitary 
and alternate at each notch of the usually continuous rachis, the 
side of the spikelet turned toward the rachis. Glumes rounded 
on the back, the two lower empty : flowering glumes rigid, rough 
on the back, 5-7-nerved, usually acute or awned at the apex. 
Palets 2-keeled. Stamens 3. Styles very short, distinct. Stigmas 
aba Grain pubescent at the apex, usually adherent to the 
palet. 
A. divergens Nees in Steud. Syn. Pl. Gram. 347. A slender densely 
tufted glaucous perennial 1-3 feet high: lower sheaths longer than the 
internodes, upper ones shorter: ligules very short: basal leaves numerous, 
4-12 inches long: those of the stem 2-4 inches long, all more or less conyol- 
ute and setaceous, nearly smooth: spikelets 3-8 inches long, slender: 
spikelets 3-6-flowered; first empty glumes 3 lines long,3-nerved, the mar- 
gins scabrous; the second 4 lines long, 5-nerved, with the midrib at one 
side, awnless; flowering glumes, 4-5 lines long, plainly 5-nerved above: 
awn stout, diverging or recurved, longer than the glumes. Common on 
dry plains east of the Cascaderange. Brit. Columbia to California and 
the Rocky Mountains. 
Var. inermis Scribn. & Smith U.. S. Dept. Agr. Div. Agrost. Bull. 
4, 27. Empty glumes unequal, narrowly lanceolate, acute, 4-6 lines long ; 
flowering glumes 5-6 lines long, smooth: acute, or acuminate, awnless or 
with a straight or spreading awn shorter than the glume. Eastern Wash- 
ington to Brit. Columbia and ldaho. 
Var. tenuispicatum Scribn. & Smith ]. c. Stems 2-3 feet high: 
leaves very narrow, spikes slender, flexuous, 3-6 inches long: spikelets 5-7 
lines long: awns 5-9 lines long. slender, straight, curved or divergent. On 
high dry plains, eastern Oregon to Brit. Columbia, Montana and Wyoming. 
A. Vaseyi Scribn. & Sm.1. c. Stems rigid, erect, wiry,1-1}¢ feet high, 
glabrous, or glaucous: sheaths glaucous, shorter than the internodes : 
ligules very short, leaves minutely strigose-pubescent above, rigid, 1-6 
inches long, 1 line or less wide: spikes very slender, 2-4 inches long: 
spikelets 4-5 lines long, 3-5-flowered: empty glumes oblanceolate, acute 
