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 



HH. 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 

 anthcsis, appressed at 



maturity Dactylis 



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



fascicles. 

 K. Palea wing-margined or 

 appendaged on the keels; 

 spikelets long and slender, 

 in racemes. California. . . Pleuropogon. 

 KK. Palea not wing-margined 

 nor appendaged. 

 li. 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. 



