14 Khodora [January 



conglomerate limestone and calcareous sandstone cliffs and ledges, 

 Cow Head, July 23, L910, Fernald & Wiegand, no. 2,615a. Quebec: 



rocky shore, Pointe Jones, Brest, Saguenay County, July 29, 1915, 

 St. John, herb. Geol. Surv. Can.; rocky hank, Romaine, Lagorden- 

 diere, Saguenay County, July 7, 1915, St .John, herb. Geol. Surv. 

 Can. 



Superficially resembling the Greenland P. vaginata (Lange), n. 

 comb.= Glyceria vaginata Lange, Fl. Dan. t. 2583 (1858); hut differ- 

 ing in its shorter spike (in / } . vaginata 5-6-flowered), shorter nearly 

 glabrous lemmas, which in P. vaginata are 3 nun. long and distinctly 

 appressed -pubescent along the lower half of the nerves, and in the 

 shorter and broader-tipped palea. 



= = Lemmas narrowed to an acute or obtuse tip, not truncate, ap- 



pressed-puhescent on the nerves below. 

 Plant whitish-green: panicle-branches smooth or nearly so: lemmas 



firm. 



7. P. laurentiana, n. sp. Figs. 33-38. Laxe caespitosa perennis 

 1-3 dm. alta rigida glauca; foliorum caulinorum laminis 3-6 cm. longis 

 involutis, vaginis basilaribus albo-brunneis; ligula 1.5 mm. longa 

 acutiuscula; panicula 0.6-1.3 dm. longa, ramis rigidis glahriusculis 

 adscendentibus deinde divergentibus vix deflexis; spiculis 4 6.5 nun. 

 longis 3-5-floris albescentibus; gluma inferiore 1-2 nun. longa an- 

 guste ovata acuta 1-nervata eroso-serrulata, superiore 2-2.5 mm. 

 longa late ovata ad apieem suhacutum abrupte angustata eroso-serru- 

 lata 3-nervata nervis lateralibus brevibus; lemmatibus ovatis supra 

 hyalinis 2.3-2.8 mm. longis abrupte acuminatis eroso-ciliolatis, nervis 

 basim versus valde pubescentibus, aervo medio ad apieem plerumque 

 scabriusculo; palea paullo breviore lanceolate ad apieem latum biden- 

 tata supra scabra basi ciliata; antheris 0.7-0.9 nun. longis; caryopsibus 

 1.5—1.8 nun. longis. 



Loosely caespitose perennial 1-3 dm. high, rigid, glaucous: eauline 

 leaves with the blades 3-0 cm. long, involute; the basal sheaths 

 whitish-brown; lignle 1.5 mm. long, aeutish: panicle 0.6-1.3 dm. 

 long; its branches rigid, nearly glabrous, ascending or finally diver- 

 gent but not deflexed: spikelets 4-0. n nun. long, 3-5-Howered, whitish: 

 1st glume 1-2 mm. long, narrowly ovate, aeutish, 1-nerved, erose- 

 serrulate; the 2d 2-2.5 nun. long, broadly ovate, abruptly narrowed 

 to the acute apex, erose-serrulate, 3-nerved, the lateral nerves short: 

 lemmas ovate, hyaline above, 2.3-2.8 nun. long, abruptly acuminate, 

 erose-eiliolate, very pubescent on the nerves below; the midnerve 

 often finely scabrous toward the apex: palea a little shorter, lanceo- 

 late, bidentate at the broad apex, scabrous above, ciliate at base: 

 anthers 0.7-0.9 mm. long: grain 1.5-1.8 mm. long. — Coasts of Bona- 



