1921] Smiley: Flora of the Sierra Nevada of California 91 



3. AVENEAE 



The flat awn terminal from between two teeth at apex of lemma. 11. Danthonia 



The terete awn dorsal on the lemma. 



Lemma convex, erose at tip, awned below its middle 15. Deschampsia 



Lemma keeled, bidentate, awned above its middle 13. Trisetum 



4. FESTUCEAE 



Spikelets with the upper florets sterile and couduplicate 14. Melica 



Spikelets with the upper florets perfect or sterile and abortive. 



Lemmas keeled, awnless; base of florets often with cobwebby hairs ....15. Poa 

 Lemmas convex, often awned; no cobwebby hairs at base of floret. 

 Nerves of the obtuse, scarious-tipped lemma prominent, parallel, 5-9. 



16. Glyceria 



Nerves of the acute green lemma unequally prominent. 



Lemma entire, mucronate or terminally awned 17. Festuca 



Lemma bidentate at the apex; if awned, the awn inserted from between 

 the teeth . 18. Bromus 



1. STIPA 



Awn plumose, at least near its proximal end 1. S. occidentalis 



Awn scabrous or puberulent, not plumose 2. S. minor 



1. Stipa occidentalis Thurb., Bot. King's ExpecL, p. 380. 1871. 



S. stricta Vasey, Bull. Torr. Bot. Club, vol. 10, p. 42. 1883. 



S. stricta var. sparsiflora Vasey, Contr. Nat. Herb., roL 3, p. 51. 1892. 



S. occidentalis Thurb. var. montana Merr. and Davy, Univ. Calif. Publ. 



Bot., vol. 1, p. 62. 1902. 

 S. oregonensis Scribn., U. S. Dept. Agr., Div. Agrost., Bull. 17, p. 130, 



f. 426. 1899. 



Type locality. "Yosemite Trail, California." Bolander 5038. 



Range. Washington to southern California, east to Wyoming. 



Zone. Arid Transition and Canadian. 



Specimens examined. Sierra Valley, Bolander, Keller M. D. and 

 Co. ; Soda Springs, Nevada County, 7,000 feet, * Jones 2583 ; Lake Val- 

 ley, 6,400 feet, Abrams 4775; Mariposa and Yosemite Trail, *Bolan- 

 der 5020; same locality, *Bolander 5038, "on loose disintegrated 

 gravel"; Hockett's meadows, Tulare County, very abundant, Dudley 

 1256; Volcano Creek, Tulare County, Hall and Babcoek 5311, at 

 8,000 feet; Tuolumne meadows, 8,500-9,500 feet, Hall and Babcock 

 3548 ; Mt. Rose, Nevada, dwarfed at 10,000 feet, Kennedy 983. 



* These specimens have the awn more or less plumose to the tip and form part 

 of the basis for the variety, which so far seems not to have been detected outside 

 of California. 



