1916] Weatherby, — Some western Species of Puccinellia 181 



SOME WESTERN SPECIES OF PUCCINELLIA. 

 C. A. Weatherby. 



In the course of a recent revision of the northeastern speeies of 

 Puccinellia, undertaken by Prof. Eernald and the writer, 1 consider- 

 able comparison with western material was necessary. Incidentally, 

 this comparison showed that the western plants which have been 

 passing as P. airoides comprise, besides true P. airoides, two other 

 species, rather readily distinguishable from it and from each other. 

 One of these, P. lucida, occurs also about the Gulf of St. Lawrence 

 and was included in the revision above-mentioned. A second, appar- 

 ently undescribed, is so clearly separable that it seems worth recording, 

 though it is entirely western in its range and therefore outside our 

 special field; and it is here proposed as P. Cusickii. Two sheets in 

 the Gray Herbarium, one collected at Anderson Valley, Oregon, June 

 24, 1896, Leiberg, no. 2388, the other at Wilson's Station in the Warner 

 Mts. of northeastern California, Griffiths & Hunter, no. 390, the latter 

 referred by Hitchcock to P. airoides (P. Nutttdtiuna),- may represent 

 still another undescribed species. All the plants mentioned are 

 characterized by erose-serrulate lemmas, pubescent below and nar- 

 rowed above to an acute or blunt apex, not truncate-obtuse as in 

 the group of P. distorts. 



A synopsis of the three species here considered follows. All the 

 specimens cited are in the Gray Herbarium, with the single exception 

 of the specimen of P. lucida from British Columbia, which is in the 

 Herbarium of the Geological Survey of Canada. 



* Anther 0.6-1 {rarely 1.2) mm. long. 



-i- Lemma 1.5-2 mm. long, not lustrous; panicle-brunches ascending 

 or spreading. 



P. airoides (Nutt.) Wats. & Coult. in Gray, Man. ed. 6,668 (1890). 8 

 — Yukon and Mackenzie to Montana, Nebraska and New Mexico. 



Representative specimens examined: — Montana: Dillon, .July 3, 

 1895, Shear, no. 331. Wyoming: open, wet, stony meadows, Centen- 

 nial, Albany Co., July 20, 1900, A. Nelson, no. 7700. Colorado: 

 Doyle's, July 29, 1901, C. F. Baker, no. 037; Walsenburg, Huerfano 



'See Rhouoba xviii, 1. 



i In Jepson, Fl. Cal. pt. 3, 162 (1912). 



a For full description and synonymy see Hhoooha xviii, 10. 



