270 



floral fjlumes oblong-Lmceolate, scabrous, aliont4 lines long, snbacute, the mid- 

 dle nerve sliortly exonrreiit; palet ono-thinl shorter, oliovute-oblong, somewhat 

 scalu'ou.s, ciliaio above. 



This is v(iry nearly tlie description of Bolander under M. poa aides variety injlata 

 (Proc.Cal. Acad. iv. 101, 1869), and ('orresi)ond8 to his specimen nnnibcrod 6121) 

 as referred to by liini. It ap])ears to be a -;o(id si)ecies, but was ai)i>arently 

 overlooked by iJr. Tliurber. His 8i)eciinens were collected in the Yoseniito Val- 

 ley in 1856, and are the only ones I have seen except a few collected by ilr. J. G. 

 I.enmiou in 1889^ near Mount Shasta, in nortbern California. 



Poa arida sp. nov. Culms from a creeping rctotstock, 1 to 2 feet higli, rather rigid, 

 smooth, Willi 2 or 3 t'hort, rigid, erect leaves ^ to 2 inches long, or sometimes 

 almost wanting; radical leaves 3 to 6 inches long, rigid, erect, tlat, or becoming 

 involute, pungently ])ointcd, stiiate; ligulc cons]iicuou8, acute; sheaths of culm 

 long, somewliat scabrous; panicle linear or oblong-linear. 3 to 6 inelies long, 

 rather dense, the rachis scabrous, or smooth near the base, branches mostly in 

 twos or tlirees, erect or appre«sed, the lower i to 1^ inches long, spikelet- 

 bearing nearly to the base; spikel(;ts short-pedicelcd, ratlier crowded, 3 to 3^ 

 lines long, ovate-lanceolate, 5- to J)-ilowered ; em])ty glomes nearly equal, 1+ to 2 

 lines long, nearly as long as the adjacent doral glumes, or shorter in few-tlowered 

 spikelets, membranaceous, rounded on the back, broadly ovate, subacute, ob- 

 scurely S-nerved, slightly scabrous, scabrous-margined; doral glumes oblong, 

 roun<led, obtuse, 1^ to 2 lines long, scarcely compressed, pubescent on tlie back 

 below the upper third, villous on the koel and marginal nerves near the base, 

 scarions at tlie apex, obscurely 5-nerved ; palet as long as its glume, sparsely 

 pubescent on tlie keels and back; grain lance-oblong slightly tri(iuetrous, about 

 i line long. 



Type specimen collected byG. R. Vaseyat Socorro, Xcw Mexico, in 1881; other 

 Bpecimens collected in Utah, Colorado, Kansas, and northward to British Amer- 

 ica. This is r. aiidhia Js'utt., in Herb. I'hila. Acad., tide F. Lamsou-Scribuer, 

 but Nuttall's manuscript name is preoccupied by a Chilian species, I', aiidina 

 Triu. It may bo distinguished from Foa fendleriana (Steud.) Vasey by the 

 smaller spikelets, smaller dorets, and the pubescence between the nerves of the 

 floral gluniea. 



Poa bigelovii Vasey & Scribn. ep. nov. Annual ; culms 6 inches to 2 feet high, weak 

 when elongated, smooth ; loaves short in arid situations, in moist ones 2 to 4 inches 

 long, flat, 1 to 2 lines wide; ligule thin, membranaceous; panicle long and nar- 

 row, 2 to 6 inches long; branches rather distant, the lower in twos or threes, 

 erect, spikelot-bearing mostly to the base; spikelets 3- to 5-flowered, 2 to 3 lines 

 long, broadly oblong, compressed; empty glnnies nearly as long as the floral 

 ones, acute ; floral glumes 1^ to 2 lines long, obbmg, subacute, villous on the keel 

 and marginal nerves to the middle or above, sparingly wcbby at the base; palet 

 one-third shorter than the glume. 



Type specimen collected by A. Fendler in New Mexico in 1817 (No. 931). It is 

 found in tlie arid districts from Texas to Lower California and northward to 

 Colorado and Utah, sjtringing up abundantly after the summer rains. It differs 

 from Poa annua L. in the narrow panicle and the presence of a web at the base 

 of the florets. In a few instances ithasbeen distributed as Foa annua variety 

 atricta Vasey. The name F. hiyelorii, without description, is given in Vasey, 

 Descr. Cat. Gr. 81 (18?<r)). 



Poa confinis Vasey, 111. N. A. Gr. ii. 75 (1893). Apparently diai-cious; culms from a 

 slender creeping rootstock, 5 to 10 inches high; leaves convolute, filiform-seta- 

 ceous, those of the numerous radical tufts mostly equaling the cnlm, smooth, 

 those of the culm similar, 1 to! inches long; ligule short, oblong, entire; the lower 

 sheaths very loose; panicle oblong, 1 to 2 inches long, confined, the branches 

 mostly short, erect, and approssed, the lower ones sometimes an inch long, 



