GRASS FAMILY 153 



Kefs. POA ANNUA L. Sp. PI. 68. 1753; Thurb. in Wats. Bot. Cal. 2: 311. 1880; Davy in 

 Jepson, Fl. W. Mid. Cal. 66. 1901 ; Abrams, Fl. Los Ang. 45. 1904. P. infirma H. B. K. Nov. 

 Gen. & Sp. 1: 158. 1816; Abrams, Fl. Los Ang. 50. 1904. 



2. P. bigelovii Vasey & Scribn. Annual ; culms erect, 6 to 15 inches high ; 

 panicle narrow, 3 to 6 inches long, the branches short, appressed; spikelets 

 ovate, about 3 lines long; glumes acuminate, 3-nerved, 2 lines long; lemmas 

 2 lines long, webbed at base, copiously pilose on the lower part of the lateral 

 nerves and keel, villous on lower portion of back between. 



Open ground, southern California to western Texas, south into Mexico. 



Locs. Panamint Canon, Jones; Los Angeles, Davidson; Colorado Desert, Coyote Canon, 

 Hall 2835; Palm Springs, Parish 6139; Laguna Mts., Orcutt. 



Eefs. POA BIGELOVII Vasey & Scribn. in Vasey, Cat. Grasses U. S. 81. 1885. P. annua 

 L. var. stricta Vasey, Bull. Torr. Club 10: 31. 1883. 



3. P. howellii Vasey & Scribn. Annual ; culms 1 to 3 feet high ; sheaths re- 

 trorsely scabrous; panicle including % to % the plant, open, the branches in 

 rather distant fascicles, spreading, scabrous, naked below, some short branches 

 intermixed ; spikelets 1% to 2 lines long, usually 3 or 4-flowered ; glumes nar- 

 row, acuminate, the first % line long, 1-nerved or rarely 3-nerved, the second 

 1 line long, 3-nerved ; lemmas webbed at base, 1 line long, ovate, pubescent over 

 the lower y 2 or %, the nerves all rather distinct. 



Rocky banks and shaded slopes, at moderate altitudes, mostly in the Coast 

 Ranges; north to Vancouver Island. Two specimens from Yosemite Nat. Park 

 (Congdon, Chase 5701) differ in having smooth sheaths and more or less 3-nerved 

 first glume, and may prove to be a distinct species. 



Eefs. POA HOWELLII Vasey & Scribn. U. S. Dept. Agr. Div. Bot. Bull. 13 2 : pi. 78. 1893. 

 Var. microsperma Vasey, Contr. Nat. Herb. 1 : 273. 1893, type from Santa Cruz, Anderson 99. 



4. P. bolanderi Vasey. Annual; culms erect, 6 inches to 2 feet high; 

 sheaths smooth; panicle open, about ^ the length of the entire plant, the 

 branches few and distant, smooth, stiffly spreading or somewhat reflexed, 

 naked below; spikelets usually 2 or 3-flowered; glumes broad, the first 

 1-nerved, 1 line long, the second 3-nerved, 1^ lines 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, confined to the Sierra Nevada and high southern 

 mountains; north to Washington, east to Alberta and Utah. 



Locs. Siskiyou Co., Butler 1747, 1750 ; Truckee Basin, Davy 3256 ; Tahoe, Hitchcock 3083 ; 

 Mt. Tallac, Hitchcock 3156; Amador Co., Hansen 2081; Yosemite Nat. Park, Hitchcock 3255, 

 3308, 3315; Madera Co., Congdon; Bald Hill, Leiberg 5062; Pine Eidge, Fresno Co., Hall 

 $ Chandler 322; Sequoia Nat. Park and vicinity, Culbertson 4436, Hall $ Chandler 432, 

 Hitchcock 3367, 3391, 3466; San Jacinto Mts., Reed 2486. 



Eefs. POA BOLANDERI Vasey, Bot. Gaz. 7: 32. 1882, type Bolander 6115 (from Ostrander's, 

 Yosemite Park, ace. Bolander 's Field Book). Var. chandleri Piper, Contr. Nat. Herb. 11: 

 132. 1906. P. howellii Vasey & Scribn. var. chandleri Davy, Univ. Cal. Publ. Bot. 1: 60. 1902, 

 type from Schakelford Canon, Marble Mt., Chandler 1703. 



5. P. macrantha Vasey. Perennial from extensively creeping rhizomes; 

 culms erect from a decumbent base, i/ 2 to V/ 2 feet high, the sterile shoots 

 widely spreading; sheaths smooth, tawny, and papery; blades smooth, in- 

 volute, more or less curved or flexuous; panicle narrow, contracted, some- 

 times dense and spike-like, 2 to 5 inches long, pale or tawny; spikelets large, 

 about V 2 inch long, about 5-flowered ; glumes smooth, 3-nerved, or the second 

 indistinctly 5-nerved, about 4 lines long; lemmas 4 lines long, not webbed at 

 base, short-pilose on the keel and marginal nerves below, slightly scabrous on 



