34 



passes in British America. It is distinguished in general from B. ciliatux by its 

 denser panicle, usually smooth leaves and sheaths and broader, more obtuse 

 flowering glume, with more pubescence. Forms also occur connecting it with 

 B. porteri. An examination of a spikelet from Hooker's type of B. ■purf/mix 

 foiu/lnpicata 1. c. collected by Drummond in the Rocky Mountains shows it to be 

 the same as B. rioh(trdf!orn. 



17a. BROMUS RICHARDSONI PALLIDUS (Hook.) n. comb. Bromm pur- 

 ;/<,nsj»ilHdus Hook. Fl. Bor. Am. 2 : 252. 1840. 



This in its typical form is distinguished from the species by the silky-villous margin of 

 the flowering glume, pale green, narrower spikelets, and smaller, denser panicle. 

 The leaves are also usually less numerous and narrower. 



Type in the herbarium of the Royal Gardens, Kew, England, collected by Drummond 

 in the Rocky Mountains. 



General distribution: Western Nebraska, Colorado, and Nevada north to the Arctic 

 coast. 



Specimens Ex.\mined. — Nebraska: 'near Mullen (P. A. Rydberg 1404). Colorado: 

 Grand Lake (Shear & Bessey 1525); Villa Grove (C. L. Shear 879); Gunnison 

 ( S. M . Tracy 442 ) . Xcrada : E. Humboldt Mount ( Watson 1328 ) . Oregoti : Fort 

 Klamath (J. B. Leiberg 670); Wallowa (C. L. Shear 1819); (W. C. Cusick 1289); 

 Powder River Mountains (C. V. Piper 2528). Washington: Loomiston (A. D. E. 

 Elmer 559). Idaho: Beaver Canyon (P. A. Rydberg 2329). Montana: East 

 Gallatin Swamp (P. A. Rydberg 3170); :Manhattan (C. L. Shear 431); Madison 

 River (P. A. Rydberg 2275); Spanish Basin (P. A. Rydberg 3114); Sheep Creek 

 ( P. A. Rydberg 3304 ) ; Columbia Falls ( R. S. Williams 605 ) . Yellowstone National 

 Park: Slough Creek (F. Tweedy 589). Wyoming: Ten Sleep (T. A. Williams 

 2832). South Dakota: Sylvan Lake (David Griffiths 721); Rochford (P. A. Ryd- 

 berg 1166). SaskatcJu'wan: (J. Macoun 79); Prairie Albert (J. Macoun 13045). 

 Alberta: near Banff (J. Macoun 26). British Columbia: Elk River (R. Kenni- 

 cott). Northwest Territories: Fort Resolution (R. Kennicott). 



The examination of a spikelet from the type specimen of this variety shows that it is 

 intermediate Ijetween B. richardsoni and B. ciliatus and intergrades with both. 

 Its denser panicle, fewer, narrower, and smoother leaves with tiie longer, silky 

 pubescence of the flowering glume separate it in its typical form from the latter 

 species. It sometimes resembles B. porteri in everything but the distribution and 

 character of the pubescence of the flowering glume. 



18. BROMUS KALMII A. Gray, Man. Bot. 600. 1848. Bromus nliatus Muhl. 

 Gram. 169. 1817. Not L. 1753. Bromus jmrgansTorr. Fl. X. Y. 2: 468. 1843. 

 Not L. 1753. (Fig. 18.) 



An erect, rather slender perennial with a drooping panicle. Culm 5-9 dm. high, 

 UKuallg pnhi'Sfrnl just below tlie nodes. Culms leaves about 3 : sheaths usualh* 

 shorter than tlie internodes, moderately retrorsely pilose-pubescent, at least the lower 

 ones; ligule about .5 mm. long, truncate, laciniate; l)lades flat, broadly linear- 

 lanceoiate, 7-17 cm. long, 5-10 mm. broad, nsualhj sparxely p'dose-pvhesrent both 

 sides, rarely nearly smooth or scabrous. Panicle small, rather crowded, 5-15 cm. 

 long, average about 10 cm. ; lower liranches 2-3, very slender and somewhat 

 flexuous, bearing 1-2 spikelets. Spikelets drooping, oblong-ovoid, closely 7-13- 

 flowered, 1.5-2.5 cm. long, 5-6 mm. broad; empty glumes coarsely pubescent, the 

 lower Imear-lanceolate, S-nerved, 5-6 mm. long, the ujjper broader, obtuse, 7-8 mm. 

 long, 5-nerred, the outer nerves sometimes indistinct; flowering glumes obtuse, 

 enuirginate, densely and coarsely silky-pn])escent, 7-n»'rved, 8-10 nnu. long; awn 

 straight, 2-3 nnn. long; palea a little shorter than the glume; joints of the 

 rachilla pubescent, 1-1.5 mm. long. 



