IMPORTANT RANGE PLANTS, 5 
Key to the Tribes and Genera, 
key to the tribes. 
A. Spikelets upon pedicels in open or spikelike panicles, not in rows. 
B. Spikelets with but 1 perfect flower (the rachilla prolonged behind the palea as 
a bristle in Calamagrostis and Cinna) Tribe Agrostideae. 
B. Spikelets with 2 or more perfect flowers. 
C. Glumes usually longer than the first floret; florets with bent awn on the back 
(excepting Koeleria) Tribe Aveneae . 
C. Glumes much shorter than the first floret, unawned or with a straight awn 
from the apex Tribe Festuceae. 
A. Spikelets sessile, in opposite rows along a zigzag jointed rachis forming a spike; 
leaf blades bearing a pair of earlike appendages at the base Tribe Hordeae. 
KEY TO THE GENERA. 
Agrostideae . 
A. Lemmas hardened, having a needlelike point at base and a long, usually twice 
bent awn at the summit Genus Stijpa. 
A. Lemmas thin and delicate, not needle-pointed at base, awnless or with a minute 
awn from the back. 
B. Spikelets in a dense spikelike head; glumes abruptly awn-tipped. 
Genus Phleum. 
B. Spikelets in open or narrow panicles; glumes not awn tipped. 
C. Floret raised on a little stalk; spikelets in a large nodding panicle. 
Genus Cinna. 
C. Floret sessile. 
D. Floret bearing at base copious white hairs sometimes as long as the 
lemma; rachilla extended behind the palea Genus Calamagrostis. 
D. Floret naked or nearly so; rachilla not extended behind the palea, the 
latter often wanting Genus Agrostis. 
Aveneae. 
A. Lemmas awn ed. 
B. Panicles open; lemmas convex, irregularly toothed or 2-lobed, awns arising 
from below the middle .Genus Beschampsia. 
B. Panicles narrow or spikelike; lemmas keeled, 2-toothed, the awn arising from 
above the middle Genus Trisetum. 
A. Lemmas not awned, panicles spikelike, culms pubescent below panicle. 
Genus Koeleria. 
Festuceae. 
A. Spikelets with upper florets usually sterile, broad and folding about each other, 
forming a club-shaped mass; glumes shining; lemmas papery, scarious margined. 
Genus Melica. 
A. Spikelets with upper florets not unlike lower ones in shape, but often reduced in 
size. 
B. Spikelets not over 5 mm. (| of an inch) long; not awned. 
C. Lemmas keeled, acute, the nerves not prominent Genus Poa. 
C. Lemmas convex, obtuse, the nerves prominent Genus Panicularia. 
B. Spikelets 1 cm. (f of an inch) or more long, awned or awn-pointed. 
D. Lemmas 2-toothed, usually awned just below the apex. . .Genus Bromus. 
D. Lemmas entire, usually awned from the tip Genus Festuca. 
