1921] Smiley: Flora of the Sierra Nevada of California 103 



15. POA 



Plants annual; lemma sparsely webbed at base 1. P. Bolanderi 



Plants perennial; lemmas not at all webbed at base. 



Plants with creepng rhizomes 2. P. Olneyae 



Plants without creeping rhizomes. 



Panicle branches divergent; culms over 1 foot high 3. P. gracillima 



Panicle branches ascending (panicle spicif orm) ; culms less than 1 foot 

 high. 



Lemma merely scabrid on the keel and lateral nerves 4. P. Pringlei 



Lemma pilose on the lower half of keel and lateral nerves 5. P. Patterson! 



1. Poa Bolanderi Vasey, Bot. Gaz., vol. 7, p. 32. 1882. 



Type locality. Not given. Ostrander's, above the Yosemite Val- 

 ley, as appears from the label of Bolander 's collection. 



Range. Washington to California, east to Alberta and Utah. 



Zone. Canadian. 



Specimetis examined. Sierra Nevada, 8,000 feet, Greene, October 

 13, 1874; Soda Springs, Jones in 1881; Ostrander's, Yosemite, Bolan- 

 der 6115; Hockett's meadows, Culbertson (B 4436). 



Specimens referrable to the var. Chandleri Piper (Contr. Nat. 

 Herb., vol. 11, p. 132. 1906) have not been seen from the Sierra 

 though they doubtless occur, since this ill-defined form, distinguished 

 only by a smaller panicle than is normal for the species, has been 

 collected both to the north and south of our region. 



2. Poa Olneyae Piper, Erythea, vol. 7, p. 101. 1899. 



Type locality. "Base of basalt cliffs in pine woods, Spokane, 

 Wash." 



Range. Washington to California? 



No authentic specimens of this species have been seen by me and 

 it is here included as a component of the Sierra boreal flora only 

 because certain collections from the high Sierra are so referred (Jep- 

 son, I.e., p. 154). 



3. Poa gracillima Vasey, Contr. Nat. Herb., vol. 1, p. 272. 1893. 



P. invaginnta, Scribn. and Williams, IT. S. Dept. Agr., Div. Agrost. Circ. 9, 

 p. 6. 1899. 



Type locality. Mt. Adams, Washington. 



Range. British Columbia to California. 



Zone. Hudsonian. 



Specimens examined. High mountain near Donner Pass, Torrey 

 572; Mono trail, among rocks, Bolander 6014; Ebbett's Pass, Bolander 

 2077 ; Mt. Dana, 11,000 feet, Bolander 5076 ; near Lake Tenaya, 8,300 

 feet, Hall and Babcock 3503. 



