GRASS FAMILY 337 



(s) Upper glume similar to 



the lower 

 h. Panicle cylindric and 



spike-like KOELERIA 



i. Panicle with spreading 

 branches, not spike-like 

 (h) Spikelets 2-flowered; 



water grasses CATABROSA 



(i) Spikelets 4-20-flow- 



ered; land grasses ERAGROSTIS 

 n. Lemma 5-11-nerved 



(m) Upper lemmas of the spikelet 

 empty, broad and folded 

 about each other MELICA 



(n) Upper lemmas not broad and 



folded together 

 r. Stigmas arising from the tip of 



the ovary 



(r) Lemma flattened, keeled 

 h. Lemma awn-pointed; 

 Spikelets in one-sided 

 groups DACTYLIS 



i. Lemma not awn-pointed 

 (h) Glumes 1-3-nerved 

 k. Axis of spikelet ex- 

 tended into a hairy 

 tip GRAPHEPHORUM 



1. Axis of spikelet not 

 extended into a 

 hairy tip POA 



(i) Glumes 5-7-nerved DISTICHLIS 

 (s) Lemma convex or rounded 



on the back 



h. Lemma awned or acute 

 (h) Lemma 5-nerved ; axis 



of spikelet smooth FESTUCA 

 (i) Lemma 7-11-nerved; 



axis hairy DANTHONIA 



i. Lemma obtuse and papery 

 at tip 



