1&- Rhodora [August 



Co., July 10, 189(i, Clements, no. 51. "Rocky Mts." (Powell Expe- 

 dition), 1868, Vasey, no. 615. 



-i- ■*- Lemma 9-4 >"»'■ long, thin and lustrous; panicle-branches often 

 deflexed in age. 



P. LUCIDA Femald k Weatherby. Rhodora xviii, 10 (1910). Shores 

 of the Gulf of St. Lawrence; Wyoming; British Columbia. Western 

 specimens examined: — WYOMING: damp soil, Washington Ranch, 

 June 29, 1001, Merrill & Wilcox, no. 63; in the margins of ponds, 

 Mammoth Hot Springs, July 30, 1899, A. & E. Nelson, no. 0017 (this 

 number, as represented in the Gray Herbarium, is partly P. liicida, 

 partly /'. airoides). BRITISH COLUMBIA: salt marshes, Newcastle 

 Island, Departure Pay, July 10, 1908, ./. Macovn, herb. Geol. Surv. 

 Can. no. 81,001. 



** Anther 1. 6-1.8 mm. long; lemma 2.5-3 vim. long; panicle- 

 branches ascending or spreading, lax and flexvotu. 



P. Cusickii, n. sp. Caespitosa perennis, 3.5-10 dm. alta viridis; 

 eulmis glabris laevibusque; foliorum eaulinorum laminis 3-14. 5 cm. 

 longis 1 2 nun. latis exsiceatis plus minusve involutis subtus laevibus 

 supra minute seabris valde nervatis, marginibus scabriuseulis; ligula 

 1.5-2.5 mm. longa; panieula 0.4-3.5 dm. longa, plerumque exserta, 

 raehi seabra, ramis filiformibus 2-5-verticillatis seabris adseendenti- 

 bus vel patentibus laxis subHexuosis imprimis supra mediam partem 

 floriferis, infimis usque ad 13 em. longis; pedieellis seabris; spiculis 

 5 mm. longis laxc 3 0-Horis saepe purpurascentibus, raehilla glabra 

 inter Mores in anthesi evidente; glumis tenuibus supra hyalinis minute 

 eroso-serrulatis, inferiore 1-1.5 mm. longa anguste ovata ad apieem 

 scutum angustata obseure 1-nervata, superiore 2-2.5 mm. longa 

 ovata acuta obscure 3-nervata; lennnatibns 2.5-3 nun. longis late 

 ovatis ad apieem acutum vel subacutum plus minusve abrupte angus- 

 tatis infra snbeoriaceis supra hyalinis et eroso-serrulatis basin versus 

 pubescentibus obscure 5-nervatis; paleis lemmata aequantibus 

 lanceolatis ad apieem fimbriato-emarginatum paullum angnstatis, 

 nervis supra seabris infra eiliatis; antheris (exsiceatis) 1.5-1.8 mm. 

 longis pnrpurcis; caryopsi immature 1.0 mm. longa. 



Cespitose perennial, green: culms 3.5-10 dm. high, rather slender, 

 little if at all geniculate, smooth and glabrous: cauline leaves 3 14.5 

 cm. long, 12 nun. wide, in dried specimens more or less involute, 

 smooth beneath, the margins and the prominently nerved upper 

 surface minutely scabrous; ligule hyaline, 1.5 2.5 nun. long: panicle 

 usually exserted, in small specimens short (down to 4 cm.) and narrow, 

 in well-developed plants diffuse, ovoid-pyramidal, up to 3.5 dm. long; 

 the rachis and branches scabrous, the latter 2 5 together, capillary, 

 ascending or spreading, lax and somewhat flexuous, Horiferous chiefly 

 above the middle, the lowest up to 13 cm. long: spikelets often purple- 

 tinged, 5 !) mm. long, loosely 3 (i-flowered, the glabrous raehilla 

 visible between the lemmas at anthesis: glumes thin, hyaline and 



