— 9GS 
| 4 
yO. Agropyron Gaertn. Wheatgrass. 
 Perennials,sometines with rhizones, with usually erect culms and spikes. 
Spikelets several flowered, sessile and solitary placed flatwise at each node 
of the continuous rachis, the rachilla disarticulating above the glumes and 
between the florets; glumes equal, firm, acute or avmed, usually shorter than 
the first lemma; lemmas firm, rounded on the back, acute. 
O Rhizomes present, well developed 
ZGlumes acute, strongly nerved; blades relatively 
G thin and rather lax 1. Ae repens 
Glunes acuminate, faintly nerved; blades very firm, 
(6 strongly nerved 2. Ae Smithii 
© Rhizomes wanting (or short ones occasionally produced 
A in A. spicatun) 
2, Lemmas awnless or short-awned 
4 Glunes obtuse or abruptly pointed; blades narrow, 
@ mostly involute 6. Ae inerme 
. 
é Glumes acute or acuminate; blades comparatively 
@ broad, flat Oe Ae 
q@ 2, Lemmas long-awned 
4 Avs straight 4. A. canine 
“a Awns divergent 5. A. spicatum 
1. Ae revens(L.) Beauv. Quackgrass. Culms erect or decumbent at the 
pase, 50-100 om. tall; rhizanes long and yellowish; blades flat and rather 
lax, scabrous, sometiwes sparsely pilose above, 10-20 cm. long, 3-10 mm. wide; 
spikes erect, 8-15 cm. long; spikelets expanded at flowering time, contracted 
at maturity, somewhat stiffly spreading; elumes acuminate, mucronate or short® =| 
as strongly 3-5-nerved, 8- 10 mie long; lemmas glabrous, the lower ones about 
10 mm. long, pointed, sometimes short-aristate. 
Fields and waste places} introduced fran Europe. c 
a 
wit ——»> Priest Lake, 2700 ft. peotire—LioF; Cocur d'Alene$ Reeth Pret Wiut~ - 
2. A. Saithii Rvib. ——>Plants usually glaucous; culms erecs, 40-90 cm. tall, 
vith long pale rhizaoies; blades ssiff, flat or inr rolled, str only nerved and 
seabrous above, snooth or nearly so beneath, 5-15 cm. long, 5-5 mm. wide; spikes 
stiffer than in A. repens; spikelets lo-cO mnie long, several amy, glumes 
indurate, smooth, very faintly nerved, subulate-pointed, about half the length .. 
sf she spikelets; lemaas hard, acuminate, mucronate, smooth or somewhat SCAOrOUS. 
© hs 
. At (—____ — 
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