222 A TEXT-BOOK OF GRASSES 



jj. Spikelets compressed. 



K. Spikelets 2-flowered; ra- 

 chilla articulate CATABROSA. 



KK. Spikelets 3- to many- 

 flowered; rachilla usually 

 continuous, the palea 

 persistent after the fall 



of the lemma ERAGROSTIS 



H. Lemmas 5- to several-nerved. (Par. 248). 



i. Lemmas flabellate, many- 

 nerved; spikelets in close 

 spike-like panicles; annual. 



California ANTHOCHLOA. 



ii. Lemmas not flabellate. 



j. Spikelets in 1-sided fascicles, 

 these in a panicle, the 

 branches spreading in 

 anthesis, appressed at 



maturity DACTYLIS 



jj. Spikelets not in 1-sided (Par. 250). 



fascicles. 



K. Palea wing-margined or 



append aged on the keels; 



spikelets long and slender, 



in racemes. California. . . PLEUROPOGON. 



KK. Palea not wing-margined 



nor appendaged. 

 L. Callus bearded (base of 

 lemma cobwebby in 

 species of Poa) spikelets 

 2- to 4-flowered. 

 M. Rachilla pilose, pro- 

 longed above the upper 

 floret; lemma with a 

 short awn just below 



the tip GRAPHE- 



MM. Rachilla naked, not [PHORUM. 



prolonged ; lemma awn- 

 less but 1 or more of 

 the nerves projecting 



beyond the apex SCOLOCHLOA. 



LL. Callus not bearded. 

 M. Spikelets as broad as 

 long, somewhat heart- 

 shaped; lemmas broad, 

 closely imbricated, 

 horizontally spreading.BRiZA. 

 MM. Spikelets longer than 

 broad. 



