Poa. GRAMINE^E. 313 



eradicate. In common with many other grasses, this at the Northwest often has its panicles of a 

 handsome bronze color, giving it a very different appearance from that usually borne by the 

 species. 



- - Culms tufted, without distinct running rootstocks or stolons. 



6. P. trivialis, Linn. Culms erect, from a somewhat decumbent base : leaves 

 and sheaths rough ; ligule oblong, acute : panicle with very rough and rather dis- 

 tant branches ; spikelets mostly 3- (sometimes but 2-) flowered, broader above : 

 lower palet distinctly 5-nerved, webbed at base, hairy only on the midnerve. 

 Eeichenb. Icon. Fl. Germ. t. 162. 



Along the Coast Ranges (Bolaiider) ; introduced. Known as Rough Meadow-grass, and com- 

 mon in the Eastern States, especially in moist meadows, though regarded as less valuable than 

 P. pratcnsis, to which it bears a very close resemblance. It is distinguished from it chiefly by its 

 rough sheaths, long and acute ligule, and fibrous roots. 



7. P. serotina, Ehrhart. Leaves narrowly linear, soft and smooth ; ligule elon- 

 gated, acute : panicle 6 to 10 inches long, at length somewhat nodding at apex, often 

 purplish ; spikelets 2-4- (rarely 5-) flowered : glumes narrow : lower palet very 

 obscurely nerved, slightly webbed below. Gray Man. 629. P. angustifolia, 

 Reichenb. Icon. Fl. Germ. t. 160. P. crocata, Michx. 



Not reported from the State, but as it is frequent in the Rocky Mountains and in Washington 

 Territory, it is likely to occur here. By some European botanists this is referred to P. pratcnsis, 

 from which the absence of running rootstocks and the character of the panicle sufficiently dis- 

 tinguish it. 



* * * Tall ; branches of the panicle solitary or in pairs. 



8. P. stenantha, Trin. Culms 1 to 2 feet high : radical leaves narrowly linear ; 

 culm leaves distant, erect, flat, 1 to 3 inches long, between 1 and 2 lines wide, ciliate- 

 scabrous on the margin, which is somewhat cartilaginous, especially at the carinate 

 apex where it is scabrous on the keel ; ligule rounded, short : panicle 2 to 6 inches 

 long, rays spreading, long-naked below, few-flowered above ; spikelets 2-5- (even 8-) 

 flowered ; florets 2 to 2^ lines long, distant upon the flexuose or zigzag very pubes- 

 cent or nearly smooth rhachis : lower palet linear-lanceolate, the edges infolded at 

 the marginal nerve which, with the keel, is ciliate-scabrous, elsewhere pubescent or 

 smooth. Mem. Acad. St. Petersb. vi. ser. i. 376; Ledeb. Fl. Ross. iv. 372; Gray, 

 Proc. Amer. Acad. viii. 409. P. leptoc.oma, Trin. 1. c. Festuca nervosa, Hook. Fl. 

 Bor.-Am. ii. 251, t. 232. 



Oregon (Hall) ; Washington Territory (Pickering), and northward. No specimens are known 

 to have been collected within the State, but it appears to be frequent at the north. The spikelets 

 vary much in the degree of pubescence as they do in the numl>er of the flowers. The infolding 

 of the lower palet at the marginal nerves gives the florets an equilateral appearance that is quite 

 characteristic. In none of the specimens at hand, from Oregon, etc., are the florets woolly at 

 base, as described for P. leptocoma, Trin. 



9. P. glumaris, Trin. 1. c. 379. Culms stout, strict, 1 or 2 feet high, with radi- 

 cal leaves about half as tall ; culm leaves 2 or 3 inches long, rigid, striate-nerved, 

 very minutely scabrous, about 2 lines wide ; ligule short, auricled : panicle 2 to 4 

 inches long, very narrow ; rays solitary or in pairs and unequal, one bearing 1 or 2, 

 the other 3 to 5 spikelets, smooth ; spikelets 3 - 5-flowered, membranous : glumes -f 

 as long as the florets, smooth, broad at base, acute, erose-margined : lower palet acute, 

 carinate at apex, 5- or indistinctly 7-nerved, pointed or rarely mucronulate at apex, 

 puberulent throughout ; upper palet equal in length, broad, coarsely ciliate on the 

 nerves : scales as long as the ovary, lacerate and ciliate : ovary hairy above ; stigmas 

 much elongated, copiously plumose. Glycerin (Arctopoa) glumaris, Griseb. in Ledeb. 

 Fl. Ross. iv. 392. Poa(V) Kingii, Watson, Bot. King Exp. 387. 



Virginia City, Nevada (Bloomer) ; East Humboldt Mountains, Watson. Not collected within 

 the State, but common northward to Sitka, etc. A most anomalous species, which Trinius, who 

 seems to have overlooked its ovary, scales, etc., referred to Poa without apparent hesitation. 

 Grisebach in Flor. Rossica placed it in Glycerin, but it is so unlike the rest of the genus that he 

 made a subgenus, Arctopoa, to include it. Mr. Watson doubtfully refers it to Poa, and notes 



