CIlLORIDEiE. 393 



U. S. Dept. Agriail. 401; Nor. Truus. Surv., Canhy &. Scrib- 

 ner; Brundeyee 375, 1179; Yellowstoue Park, Tivmbj 597, 1070 

 in part. 



Lower Canada to Kocky Mountains, British America to 

 Oregon, California. 



Tribe X.— CHLORIDEiE. 



Spikclets 1- to sevovjii-flcnvereil, sessile or nearly so in two rows on 

 the outer side of a rachis that is neitlier liOtched nor articulate. 

 Spikes usually several and often digitate. '^Dio inflorescence re- 

 sembles that of Paspaluin; the spikelets those of Festuccw. The 

 awns when present arc terminal and straight; palca 2-uerved; 

 grain not adherent, unfurrowed. 



A. One or more perfect llowers in each spikelet (a) 



a. One perfect tlower (very rarely two) in each spikelet. . (1)) 

 b. No sterile glumes, and only rarely a prolongation 

 of the racliilla above the single ilower (c) 



c. Hpikc single, terminal, floral glume shorter than 



the 1-nerved empty glumes; jierennial. ... 83 



c. Spikes "-i-O. digitate; perennial 83 



c. Spikes 3-10, recurved, floral glume longer than 



the 1-ncrved empty glumes 89 



e. Spikes 3-30, racemose, straight, spikelets fall- 

 ing from the rachis entire when mature. . . 84 

 b. One or more sterile glumes (very rarely a sterile 

 flower) above the perfect flower (d) 



d. Spikes l-*2, terminal, usually curved, pectinate. 85 

 d. Spikes 1-20, digitate, nearly straight, not pecti- 

 nate, floral glume with 1 awn or awnless. ... 86 



d. Spikes l.')-30 in approximate whorls or digitate, 

 straight, floral glumes with 3 awns 87 



d. Spikes 10-30, remote, racemose, straight, slen- 

 der, spikelets remote 88 



d. Spikes few to many, racemes remote, straight 

 or curved, often pectinate, spikelets crowded. . 90 



