42 



22. BROMUS ORCUTTIANUS Vas. Bot. Gaz. 10:223. 1885. (Fi^r. 23.) 

 A rather stout, erect, perennial 8-12 dm. high. Cuhii leafy below, mostly puljeru- 

 lent at and just below the nodes. Sheaths usually glabrous; ligule 1-2 mm. long, 

 subtruncate; T)lades hroadh/ Unear-Idnreolair, rather coarse, smooth throughout, 10-20 

 (;m. long, 5-7 mm. broad. Panicle narroir-pi/ramidal, erect, ornearb/so, 10-15 cm. 

 long, 5-8 cm. broad at the base when spread, branches feAv, vlclely diraricate in 

 fnilt and rather rigid. Spikelets about 2-2.5 cm. long, 2-3 mm. broad, on short, 

 stout pedicles, terete-acuminate, 5-9 flowered; florets at maturity rather distant on 



a slender zigzag rachilla, 

 separating and falling 

 easily at maturity ; empty 

 glumes narrow, smooth 

 or scabrous, the lower 

 acute, 6-8 mm. long, 

 1 -nerved, or sometimes 

 with 2 short, faint lateral 

 nerves, the upper broad- 

 er, subobtuse, 3-nerved, 

 8-10 mm. long; flower- 

 ing glume 10-12 nun. 

 long, nari-oM', obtuse, sca- 

 brous to scabrous-jnibescent 

 over the bach, faintly 

 5-7-nerved, with a hya- 

 line, slightly emarginate 

 apex; awn rather stout, 

 about 5-7 mm. long; 

 palea nearly equaling its 

 glume; rachilla slender, 

 puberulent, joints about 

 4 mm. long. 

 Type in the Herbarium U. S. 

 Department of Agricul- 

 ture, collect eil by C. R. 

 Orcutt in the mountains 

 near San Diego, Cal., 

 No. E. 

 General distribution : South- 

 ern Galifornia to Wash- 

 ington, chiefly on rather 

 dry open mountain sides 

 and in dry evergreen 

 forests. 

 Specimens examined.— <_WZ/- 

 forn la : Open w o o d s , 

 Truckee River (C. F. 

 Sonne 21); Southern California (Dr. E. Palmer 233); Mariposa (J. W. Congdon); 

 Pioneer (Geo. Hansen 1835); Kaweah River Valley (Coville and Funston'l34G); 

 San Jacinto Mountains (H. M. Hall 7861); Forest Dale (J. B. Davy). Oregon: 

 Ashland Butte (T. Howell 253) ; Gayhart Butte (Coville and Leiberg'277). Wash- 

 ington: Mount Adams (W. X. Suksdorf 120); Klickitat River near Mount Paddo 

 (Mount Adams) ( W. N. Suksdorf 172). 



Fig. 23. — BromuK nrciiltianuit : a, i-mpty glumes with a floret ; 

 6, dorsal view of a flowering glume. 



