GRASS FAMILY 



199 



2. Poa bigelovii \'asey & Scribn. 

 Bigelows Bluegrass. Fig. 454. 



Poa annua stiicta Vasey, Bull. Torrey Club 10: 31. 1883. 

 Poa bigelovii Vasey & Scribn.; Vasey, Descr. Cat. Grasses 

 U. S. 81. 1885. 



Annual; culms erect, 15-35 cm. tall; panicle 

 narrow. 7-15 cm. long, the branches short, ap- 

 pressed ; spikelets ovate, about 6 mm. long ; glumes 

 acuminate. 3-nerved, 4 mm. long; lemmas 4 mm. 

 long, webbed at base, copiously pilpse on tlie lower 

 part of the lateral nerves and keel, villous on lower 

 portion of back between. 



Open ground in the Lower Sonoran Zone; southern 

 California to western Te.xas, south into Mexico. Apr. -May. 

 Type locality: Rillito River, Arizona. 



3. Poa howellii \'asey & Scribn. 

 Howell's Bluegrass. Fig. 455. 



Poa howellii Vasey & Scribn. U. S. Dept. Agr. Div. Bot. 



Bull. 13=: pi. 78. 1893. 

 Poa howellii microsperma Vasey, Contr. U. S. Nat. Herb. 



1: 273. 1893. 



Annual ; culms 30-60 cm. tall ; sheaths retrorse- 

 ly scabrous or sometimes smooth ; panicle includ- 

 ing one-third to half the plant, open, the branches 

 in rather distant fascicles, spreading, scabrous, 

 naked below, some short branches intermixed ; 

 spikelets 3-4 mm. long, usually 3- or 4-flowered; 

 glumes narrow, acuminate, the first 1.5 mm. long, 

 1-nerved or rarely 3-nerved, the second 2 mm. 

 long, 3-nerved ; lemmas webbed at base, 2 mm. 

 long, ovate, pubescent over the lower half or two- 

 thirds, the nerves all rather distinct. 



Rocky banks and shaded slopes, in the Humid Tran- 

 sition Zone: Vancouver Island to southern California, 

 mostly in the Coast Ranges. Apr.-Aug. Type locality: 

 Portland, Oregon. 



4. Poa bolanderi Vasey. 



Bolander's Bluegrass. Fig. 456. 



Poa bolanderi Vasev, Bot. Gaz. 7: 32. 1882. 



Poa howellii chandteri Davy, Univ. Calif. Publ. Bot. 1: 60. 



1902. 

 Poa bolanderi chaudlcri Piper, Contr. U. S. Nat. Herb. 11: 



132. 1906. 



Annual; culms erect, 15-60 cm. tall; sheaths 

 smooth; panicle open, about half the length of the 

 entire plant, the branches few and distant, smooth, 

 stififly spreading or somewhat reflexed, naked be- 

 low ; spikelets usually 2- or 3-fiowered ; glumes 

 broad, the first 1-nerved, 2 mm. long, the second 

 3-nerved, 3 mm. long; lemma scantily webbed at 

 base, smooth, scabrous on the keel, acute, the 

 marginal nerves rather indistinct, the intermediate 

 nerves obsolete. 



Open ground or open woods, in the Canadian Zone; 

 Blue Mountains of Washington, through the Sierra Ne- 

 vada to the high mountains of southern California, east to 

 Utah. Tune-Aug. Type locality: Yosemite National Park. 



