46 



B. FdnirJi- varrow, erect or nearli/ so, spikcleU asiudhj l>ir</rr IIkiii in A, and the pubescence 



on the ^flowering not evenly dhiriliiilril. 



25. BROMUS SUKSDORFII A"a8. Bot. (hiz. 10: 22.1 1885. (Fig. 26.) 

 An <Tect, coarse, tufted, leafy perennial, 6-10 dm. high. CUilni smootli or puberulent 

 jn.«t below the nodes. Sheaths smooth; ligule about 1 mm. long, mhcorlaceovs, 

 truncate, dentate; blades mostly 5-6, broadly linear-lanceolate, rather ahmpdy anmii- 

 nate, 1-2 dm. long, 8-11 mm. broad, Jinn and smooth. Panicle narrow, erect, 

 rather dense, mostly 8-13 cm. long, lower branches 2-5, longest 2-4 cm. long, 



erect or ascending. S pikelets 

 5-9-fiowered, 2-3 cm. long, terete 

 at first, becoming somewhat lan- 

 ceolate at flowering; pedicels 

 shorti'r than the spikelel.^-; empty 

 glumes glabrous or scabrous on 

 the nerves, the lower lanceolate- 

 acuminate, 1-nerved or sometimes 

 with a short faint lateral nerve ( )n 

 each side, 8-10 mm. long, the up- 

 per broader, sul)acute, 3-nerved, 

 10-12 mm. long; flowering glume 

 oblong - lanceolate, s u b a c u t e , 

 12-14 mm. lo7ig with 3 prominent 

 nerves and frequently 2 other 

 very faint ones on each side, ap- 

 2)ressed-puliescerd from the lateral 

 nerves to the margins a)td <ni fJie 

 midnerve abouthalficay n/i the back, 

 other portions smooth or sca- 

 brous, emarginate at the apex ; 

 awn 2-4 mm. long; palea little 

 more than three-fourths the length 

 of //.s ghnne. 

 Type No. 74, collected l)y W. N. 

 Suksdorf "in loose soil on dry 

 mountain sides," Mt. Adams, 

 Washington. 

 General distriVnition: Mountains of 



Oregon and Washington. 

 Specimens examined. — Oregon: Cra- 

 ter Lake(Coville & Leiberg 423); 

 ■ Powder River Mt. (C. V. Piper 

 2523); Ashlan.l P>utte(T. Howell 

 249); (W.C.Cusick 1075). 

 This species is closely related to B. 

 paDtjtelHanas, but differs in lacking the t'reeping rootstock and in having a denser 

 panicle, longer flowering glume with shorter pubescence and shorter palea. The 

 spikelets are also narrower in flower and greenish straw color. 



26. BROMUS ERECTUS Huds. Fl. Angl. 30. 1762. liromus macoumiY^s. Bnl. 



Torr. Hot. Clul), 15: 48. 1888. (Fig. 27.) 

 A csespitose i)erennial with narrow leaves and an erect suhsimple i)anicle. Culms 



al)out 6-;i dm. higli, erect, glalirous. Sheaths sparingly pilose or nearly glahrous; 



ligule al)out 1.5 mm. long: lilades somewhat ligiil, narrowly linear, sparingly 



Fig. 26.— £/Y»/f.(.s t^nktidoifi'i : a, c'mi;)t.v glume.s with t\v 

 florets; h, dorsal view of a flowering glume. 



