1916] Fernald & Weatherby — Puccinellia 17 



riore plerumque inclusa, ramis filiformibus scabris laxe divergentibus 

 deinde deflexis; spiculis 5-9 mm. longis 3-5-floris pallide viridibus; 

 glumis tenuibus lucidis, inferiore 2-3.5 mm. longa ovata acuta supra 

 hyalina minute serrulata nervo medio scabro, superiore 2.5^ mm. 

 longa 3-nervata nervis evidentibus; lemmatibus 3-4 mm. longis 5- 

 nervatis late ovatis acutis eroso-ciliolatis basin versus valde pubescenti- 

 bus, pilis longis; palea 2.5 mm. longa lanceolata ad apicem latum 

 bidentata supra scabra basi ciliata; antheris 1-1.2 longis; caryopsibus 

 1.8-2 mm. longis. 



Loosely caespitose, 1.5-7 dm. high, green: cauline leaves with 

 blades 4.6-12 cm. long, involute, flaccid; the basal sheaths more or 

 less purplish; ligule 1.7-2.5 mm. long, acute: panicle diffuse, 1-2.5 

 dm. long, the base commonly included in the upper sheath; branches 

 filiform, scabrous, loosely divergent, finally deflexed: spikelets 5-9 

 mm. long, 3-5-flowered, pale-green: glumes thin, lustrous; the 1st 

 2-3.5 mm. long, ovate, acute, hyaline above and minutely serrulate, 

 with the midnerve scabrous; 2d 2.5-4 mm. long, 3-nerved; the nerves 

 evident: lemmas 3-4 mm. long, 5-nerved, broadly ovate, acute, 

 erose-ciliolate, strongly pubescent toward the base with long hairs: 

 palea 2.5 mm. long, lanceolate, bidentate at the broad apex, scabrous 

 above, ciliate below: anthers 1-1.2 mm. long: grain 1.8-2 mm. 

 long — Sea shores and damp (presumably alkaline) soil, Quebec, 

 Wyoming and British Columbia. Quebec! brackish gravelly shore ^ 

 Cacouna, August 8, 1902, Fernald (type in Gray Herb.); mouth of 

 Riviere du Loup, 1860, Ch as. Pickering: salt marsh near the wharf, 

 Ste. Anne, Kamouraska County, July 21, 1907, F. F. Forbes; Murray 

 River, August 14, 1905, -/. Macoun, herb. Geol. Surv. Can. no. 69,217 

 (material under no. 69,217 in Gray Herb, from "Vicinity of Cap a 

 l'Aigle" is partly P. lucida, partly P. paupercula, var. alaskana). 

 Wyoming: in the margins of ponds, Mammoth Hot Springs, July 

 30, 1899, A. & E. Nelson, no. 6,017; damp soil, Washington Ranch, 

 June 29, 1901, Merrill & Wilcox, no. 63. British Columbia: salt 

 marshes, Newcastle Island, Departure Bay, July 10, 1908, J. Macoun, 

 herb. Geol. Surv. Can. no. 81,001. 



In some characters related to each of the three species, P. lauren- 

 tiana, P. macra and P. airoides. From P. laurentiana and P. airoides 

 separated at once by the longer, thin, lustrous lemmas; from the 

 former also by its capillary widely divergent and very scabrous 

 panicle-branches and the softer greener foliage; from the latter by 

 the longer grain and the commonly less exserted panicle. From 

 P. macra at once distinguished by the diffuse panicle, pale spikelets, 

 involute leaves and longer lemmas and achenes. 



++ ++ Lemmas entire or at ?nost remotely few-toothed, not ciliolate. 



