IGO GRAMINEAE 



12,000 feet altitude: Mt. Lyell, Hitchcock 3294, 3296, 3300, 3302; Lyell Fork 

 Canon, Hitchcock 3290; Siberian Outpost, Hitchcock 3436, 3451. 3452.* The 

 t.ype, from southeastern Oregon, is the only other collection known. 



Ref.— Po.v LEiBKRGii Scribn. U. S. Dept. Agr. Div. Agros^ Bull. 8: 6. pi. 2. 1897. 



30. P. cottoni Piper. Tufted perennial ; culms erect, smooth, scabrous be- 

 low panicle, 1 to 2 feet high; sheaths smooth or slightly scabrous; ligule less 

 than 1/2 line long; blades involute, erect, scabrous; panicle long-exserted, 

 oblong, contracted, sometimes almost spike-like, 1 to 2 inches long; spikelets 

 about 3 lines long; glumes broad, smooth, scarcely scabrous on the keel, the 

 first 11/4; lines long, the second a little longer; lemmas 2 lines long, smooth or 

 minutely scabrous, not webbed at base, nerves all prominent. 



Rocky woods, and along mountain streams, high Sierra Nevada, north to 

 Washington. 



Locs. — Pine Creek, Baker 4~ Nutting, Davy; Nevafla Co., Sonne; Sierra Valley, Lemmon 

 546.3; Ij.ake Tahoe, Hitchcock 31.54, Eeed # Pendleton 1624; Mt. Lyell, Hltchcnck 3298; Fare- 

 well (i.-ip, Uitchcocl' 338(i; Mt. Whitney, BitcUcock 3449. 



Kef.— Po.v COTTO.N-I Piper, Proc. Biol. Soe. Wash. 18: 146. 1905. 



59. GLYCERIA R. Br. 



Spikelets few to many-flowered, subterete or slightly compressed, in narrow 

 or spreading panicles. Glumes unequal, shoi't, olituse or acute. Lemmas con- 

 vex, firm with a scarious margin or apex, usually obtuse, awuless, 5 to 9-nerved, 

 the nerves usually prominent. Usuall.y tall aciuatic perennials. — Species about 

 16, temperate regions of both hemispheres. (Greek glukeros, sweet.) 

 Spikelets linear, over 5 lines long. 



Lemmas about 2i4 lines long 1. G. plicata. 



Lemmas about 1% lines long. 



Spikelets about '-j line wide, green; lemmas smooth or minutely scabrous on the nerves. . . 



2. G. borealis. 

 Spikelets about 1 line wide, purplish tinged; lemmas scabrous on the nerves and somewhat 



so between them • 3. G. leptostackya. 



Spikelets ovate or oblong, not over 21i, lines long. 

 Lemmas with 5 prominent nerves. 



Panicle ovate or pj'ramidal, open 4. G. pauciflora. 



Panicle narrow, branches ascending 5. G. erecta. 



Lemmas with 7 prominent nerves 6. G. elata. 



1. G. plicata Pries. Culms ascending from a decumbent rooting base, rather 

 thick and succtdent. 4 to 3 feet tall ; sheaths smooth ; blades 1^2 to 5 lines wide, 

 scabrous al)ove; panicle long and narrow; glumes very unequal, obtuse, the 

 second ly^ lines long; lemmas purple-tinged, liroad, obtuse, 2Vi> lines long, 

 prominently 7-nerved, with an additional short pair near the margin, very 

 scabrous on the nerves and somewhat so between them; palea aliout as long as 

 lennua. 



In shallow water, ]\Iendocino Co. (Sherwuod, Davi/ 5183, Hitchcock 2710; 

 Walker Valley, Davy tf- Blasdale 5083) : Oreg(m to Vancouver Island. 

 Ref. — Glyceri.\ plicata Fries, Mant. 3: 176. 1842. 



2. G. borealis Batehelder. Culms 2 to 3 feet high, erect from a more or less 

 decumbent and rooting base: sheaths smooth or slightly scabrous, keeled; 

 blades fiat or usually folded, scabrous above, erect. IV^ to 2 lines wide; pani- 

 cle long and narrow, the branches ami slender pedicels appressed; spikelets 

 narrow, nearly terete, i/o to % inch long, Yo line wide, pale, not purple-tinged; 

 glumes 1-nerved. the first % line, the second 11/2 lines long; lemmas oblong, 

 2 lines long. 7-nerved. smooth or indistinctly scabrous on the nerves. 



Jepsnn, Fl. Cnl. vot 1 (Gr.Tmintac by Hitchcock, pp. 82-160, Apr. 22. 1912). 



