GRASS FAMILY. 



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sometimes interrupted below. Spikelets as in Panicum, but always 

 awnless, tbe short peduncles produced beyond them into one to several 

 awn-like bristles which are at one side of the spikelet, not forming a 

 c omplete involucre. (Greek chaite, bristle, chloe, grass, referring to 

 the tuft of bristles at the base of the spikelet. A genus easily recog- 

 nized by the dense spike-like panicle, usually bristling with numer- 

 ous setae; these issue from the pedicels just below the spikelets in 

 the form of an involucre, and are not epidermal, like true hairs, but 

 appear to be abortive panicle-branches.) 



1. C. glauca (L.) Scribn. Bristly Foxtail. Stems erect, 

 branching below, 1 to 2 ft. high, leafy; mouth of the sheath clothed 

 with long, silky hairs; blades 4 to 12 in. long, 3 to 5 lines broad, 

 scabrid or scabrous, sometimes sparsely ciliate; panicles 1£ to 2h or 4 

 in. long, usually on a long, slender, naked peduncle, though, some- 

 times, at first partially enclosed by the uppermost sheath; bristles 

 pale green or tawny yellow; spikelets oval, about 1 line long and a 

 little less broad, obtuse or sub-acute, pale green. — (Setaria glauca 

 Beauv.) 



Introduced weed, perhaps not yet occurring within our limits. In 

 the San Joaquin Valley at Fresno, Bio/rtti. June-Oct. 



Tribe 3. Phalarideae. Canary-grass Tribe. 



Spikelets arranged in panicles, all alike, with 1 perfect flower, 

 which is terminal, and 1 or 2 empty bractlets or staminate flowers 

 below it; empty bractlets occasionally very small or rudimentary. 

 Bractlet and palea of the perfect flower alike, usually becoming 

 indurated, laterally compressed, awnless. nerveless or with only 1 

 nerve. 



Perfect flower subtended by 1 or 2 empty bractlets which are often minute or 

 rudimentary. 



Empty bractlets minute, entire, awnless or with minute bristles at the apex. 



5. Phalaris. 



Empty bractlets equaling or exceeding the flower enclosing bractlet, bifid 



and awned on the back 6. Anthoxaxthum. 



Perfect flower subtended by 1 or 2 staminate flowers . . . . 7. Hierochloe. 



5. PHALARIS L. Canary-grass. 

 Blades flat. Inflorescence a dense, spikelike, rarely interrupted, 

 thyrse. Spikelets crowded, 1-flowered. Bracts about equal in 

 length, boat-shaped, complicate, strongly compressed laterally, 

 usually winged-keeled, 3-nerved. Bractlet and palea of perfect 

 flower subtended by 2, or only 1, small or rudimentary, more or less 

 hairy, empty bractlets. Flower-enclosing bractlet and palea alike, 

 shorter than the bracts, complicate, becoming indurated in fruit; 

 palea a little the smaller. Scales 2 and minute, or obsolete. Stamens 

 3. Ovary smooth. (Greek phalaros, having a patch of white, from 

 the broad, light-colored margins and patches between the nerves of 

 the bracts in some species. Supposed to be the Phalaris of 

 Dioscorides). 



Spikelets all perfect ; bracts decidedly winged-keeled on the bark ; annuals. 

 Rudimentary bractlets 2: thyrse ovoid. 



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