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 Eordeae. 



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 Stipa. 



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 awned. 



B. Panicles open; lemmas convex, irregularly toothed or 2-lobed, awns arising 



from below the middle Genus Deschampsia. 



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. (J- of an inch) long; not awned. 



0. 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 Brornus. 

 D. Lemmas entire, usually awned from the tip Genus Festuca. 



