LAMSON-SCRIBNER AND MERRILL — GRASSES OF ALASKA. 51 



Lemmas 5 to many-nerved. 



Spikelets nearly sessile in dense one-sided clusters at the 



ends of the few panicle branches 17. Dactylis. 



Spikelets not in dense one-sided clusters at the ends of the 

 panicle branches. 

 Callus barbate or pilose. 



Panicles erect, strict, the rigid branches usually 



divergent 20. Dupontia. 



Panicles nodding, the spreading branches usually 



capillary 19. Colpodium. 



Callus naked. 



Lemmas rounded on the back. 



Nerves of the lemmas prominent. 



Lemmas long acuminate pointed l(i. Melica. 



Lemmas obtuse 21 . Panicularia. 



Nerves of the lemmas obscure or manifest only 

 near the apex. 

 Lemmas obtuse, awnless. 



Glumes usually small and distinctly 

 shorter than the lemmas. Grasses 



of alkali plains and the seashore 22. Puccineu.ia. 



Glumes usually about as long as the 

 nearest lemma, the latter more or 



lens pubescent 18. Poa. 



Lemmas acute or obtuse, often awned. 

 Lemmas acute or awned from the 



apex 23, Festuca. 



Lemmas obtuse, usually awned just 



below the apex 24. Bromus. 



Lemmas compressed-keeled. 



Spikelets 1 to 2 cm. or more in length, short - 



awned 24. Bromus. 



Spikelets less than 1 cm. long, awnless; lemmas 

 usually with a tuft of cobwebby hairs at the 

 base 18. Poa. 



Tribe VI. HOBDEAE. 



Spikelets solitary at each node of the rachis 25. Aoropyron. 



Spikelets 2 or 3 at each node of the rachis. 



Spikelets 3 at each node of the rachis, 1-flowered 26. IIordeum. 



Spikelets 2 at each uode of the rachis, several-flowered. ... 27. Elymus. 



1. SAVASTANA Sehrank. 



Savastana Sehrank, Baier. F\. 1: 100. 337. 1789. 



HierochloeJ.G. Gmelin, Fl. Sibir. 1: 101. 1747. 



Spikelets 3-flowered, the terminal flower hermaphrodite, the others staminate; 

 rachilla articulated above the glumes; glumes subequal, glabrous, equaling the spike- 

 let; lemmas awnless or short-awned. Fragrant perennial grasses with flat leaves and 

 terminal panicles. 



First and second lemmas awned 1 . S. alpina. 



First and second lemmas awnless. 



Lemmas entire; culms 30 to GO cm. high; panicles ample 2. S, odorata. 



Lemmas erose-truncate; culms 15 cm. high or less; panicles 

 very narrow, few-flowered 3. S. paucifiora. 



