GRASS FAMILY 157 



Refs. POA SCABRELLA Benth. ; Vasey, Grasses U. S. 42. 1883; Abrams, Fl. Los Aug. 51. 

 1904. Atropis scabrella Thurb. in Wats. Bot. Cal. 2: 310. 1880, type from Oakland, Bolander. 

 Poa orcuttiana Vasey, W. Am. Sci. 3: 165. 1887, type from San Diego, Orcutt. P. limosa 

 Scribn. & Williams, U. S. Dept. Agr. Div. Agrost. Circ. 9: 5. 1899, type from Mono Lake, 

 Bolander. The species of this group reqirre careful monographic study. Poa secunda Presl 

 (Eel. Haenk. 1: 271. 1830), from Chile appears to belong to this species, and, if so, the name 

 must be taken up as has been done by Davy (Jepson, Fl. W. Mid. Cal. 67. 1901. See also, 

 Scribn. Eep. Mo. Bot. Gard. 10: 51. pi. 51. 1899). P. bucldeyana Nash (Bull. Torr. Club 

 22: 465. 1895; P. tenuifolia Buckl. Proc. Acad. Phila. 1862: 96. 1863, not A. Eich. 1851) is 

 probably also a synonym. 



17. P. sandbergii Vasey. Similar to P. scabrella ; differing in being smooth, 

 averaging lower and more slender, the panicle smaller, the blades short and 

 soft, often involute. 



Plains and dry or rocky woods from Ventura and San Bernardino cos. north 

 to British Columbia and east to Wyoming. Specimens intermediate between 

 this species and P. scabrella occur. 



Refs. POA SANDBERGII Vasey, Contr. Nat. Herb. 1: 276. 1893. Atropis tenuifolia Thurb. 

 in Wats. Bot. Cal. 2 : 310. 1880, mainly as to description but the name is based on Poa 

 tenuifolia Buckl. 



18. P. nudata Scribn. Differs from P. scabrella in having a close and spike- 

 like panicle, nearly naked culms, and capillary blades. 



Only known from the type specimen, collected at Potrero. San Diego Co.. in 

 1892, the collector unknown. 



Eefs. POA NUDATA Scribn. U. S. Dept. Agr. Div. Agrost. Circ. 9: 1. 1899. P. capillaris 

 Scribn. U. S. Dept. Agr. Div. Agrost. Bull. 11 : 51. 1898, not L., type from Potrero. 



19. P. tenerrima Scribn. Differs from P. scabrella in having a much more 

 open panicle, with spreading branches ; blades capillary ; ligule short. Known 

 only from the type specimen, which was sent to Prof. Scribner from the Cali- 

 fornia Academy of Sciences, without data as to locality or collector. 



Eef. POA TENERRIMA Scribn. U. S. Dept. Agr. Div. Agrost. Circ. 9: 4. 1899. 



20. P. alcea Piper. Tufted perennial ; culms slender, 2 to 3 feet high, loose 

 and decumbent at base ; sheaths smooth or somewhat scabrous, loose and papery 

 at base; ligule long; blades flat, rather soft, more or less scabrous; panicle 

 loose and open, the branches 1 to 2 inches long, ascending; spikelets 3 to 4 

 lines long, tawny; glumes smooth, the second 2 lines long; lemmas about 2 

 lines long, puberulent at base, the nerves not prominent. 



Wet rocks and rocky banks, Mendocino Co. (Sherwood, Hitchcock 2714) ; also 

 in Oregon. A specimen from Palm Springs (Parish 6141) is tentatively referred 

 to this species but it is far out of the known range. 



Eef .PoA ALCEA Piper, Bull. Torr. Club 32 : 436. 1905. 



21. P. gracillima Vasey. Tufted perennial; culms 1 to 2 feet high, erect 

 from usually a decumbent base; sheaths smooth; ligule iy 2 lines long; blades 

 flat or folded, lax, smooth, mostly basal; panicle pyramidal, loose, rather open, 

 2 to 4 inches long, the branches in whorls, the lower 2 to 6. 1 to 3 inches long, 

 slender, spreading or sometimes reflexed, naked below; spikelets 2 to 3 lines 

 long; glumes smooth, the second 1% to 2 lines long; lemmas about as long as 

 second glume, minutely scabrous, crisp-pubescent near base, especially on the 

 nerves. 



Rocky woods or gravelly soil, in the Sierra Nevada from Nevada Co. (Torrey 

 572) to Sequoia Nat. Park (Hall & Babcock 5540) ; Oregon to British Columbia. 

 Two specimens with smooth lemmas are referred here, Nacimiento River, Mon- 

 terey Co., Davy 7673 and Ebbetts Pass, Brewer 2077. The former is out of 

 range and may belong to a different species. 



