58 



ing rather turgid at maturity; empty glumes subobtuse, pul")erulent, tlie lower 



3-5-nerve<l, 8-10 nun. long, the upper 7-nerved, 10-12 mm. long; flowering glume 



appressed-puheyiilint, indistinctly 7-nerved, 12-15 nun. long, with two short, 



rather ol)tuse, hyaline teeth and iisfoiif(urn S-4 '»»'• long; palea short |)ectinate- 



ciliate on the keels, about 3 mm. shorter than its glume. 

 Type No. 249, S. M. Tracy, collected at Reno, Nevada, in 1887. 

 Distribution: Nevada and California. 

 SpnciMEXs EXAMixED. — Nevada: I.e. ('<iI!forii!a : Grassy mountain slope. Fort Tejon 



(S. B. Parish No. 1995). 

 This plant is most closely related to B. mmr/inalus from which it is distinguished 



chiefly by the narrow, 



rigid, involute lea\es, ca- 



iiescent leaves and sheaths, 



and somewhat ciespitose 



hal)it. It seems to l)e pecu- 



liar to arid regions. 



31. BROMUS MARGIN A- 



TTJS Nees in Steud. Syn. 

 PI. Gram. 322. 1854. Bro- 

 mus hreviaristntns Buckl. 

 and most auct. anier. Not 

 Ceratoch loa h r e r I a r I .s- tala 

 Hook. Bromiis jxntciflo- 

 riis Nutt. in Herb. Acad. 

 Nat. Sci. Phil. (Fig. 33.) 



An erect, tufted, rather 

 stout, short-lived peren- 

 nial. C'Ulm 6-12 dm. high, 

 mostly puberulent or jiu- 

 bescent. Sheaths pllnsf- 

 puhesceni; ligule 3-3.5 mm. 

 long, subrotuufl, laciniate; 

 blades Ijroad, linear-lanceo- 

 late, Homeivhat i<i>ari^ely 

 pilose-pubescent tJiroiigJioiit, 

 rather rough and coarse, 

 1.5-2.5 dm. long, 6-12 mm. 

 wide. Panicle erect, i-ather 

 narrow, mostly 1-2 dm. 

 long; luirer brandicx ;i-4, 

 erect, or somewhat spread- 

 ing inflou-er, unequal, lowest 

 rarely more than 7 cm. long 

 tnid hearing, 2 spihelets. 

 Spikelets 2.5-4 cm. long, 

 5-7 mm. wide, oblong- 

 ovoid to ol)long-lanceolate, laterally compressed, somewhat turgid at maturity, 

 mostly 7-9-flowered, erect or ascending, the uppermost subsessile; empty glumes, 

 rather broad, scabrous to scabrous-ptihescent; the lower subacute, 3-5-nerved, mostly 

 7-9 mm. long; the upper broader, obtuse, 9-11 mm. long, 5-7-nerved, the lateral 

 nerves broad; flowering glume, subcoriaceous, coarsely pidiescent, ovate-lanceolate, 

 acute, 11-14 mm. long, mostly 7-nerved, with two very short hyaline, mbacute 

 teeth atthe apex and a- rather stout straight awn 4-7 mm. long ; palea ciliate-pectinate 

 on the keels, almost or (juite equaling its glume. 



Fk;. '.^:i. — Bromus maj-ginatus : a, empty glumes with three 

 florets; 6, dorsal view of a flowering glume. 



