52 



An examination of a spikelet from the type of Cemtochloa breviurislata Hook, proves 

 conclusively that this is a mere short-awned foi-m of B. unioloides. It is possible 

 that the locality cited, "on the dry elevated ground of Lewis and Clarkes River, 

 and near the sources of the Columbia," may be the result of a confusion of labels. 

 The plant, if found there, must almost certainly have been an adventitious one, 

 which seems to us scarcely probable at that time — 1826. 

 This species has been in cultivation so long that its endemic distribution is difficnlt 



or impossible to determine. 

 29a. BROMUS UNIOLOIDES HiENKEANTJS (Presl.) n. comb. Cerdtochlua 



hxnkeana C. B. Presl in J. S. 

 Presl, Reliq. Hsenk. 1: 285. 

 1828. (Fig. 31.) 

 An annual or biennial plant differ- 

 ing from the species in its 

 smaller size, being about 1.5-5 

 dm. high, and narrow, erect, 

 subracemose panicle 5-10 cm. 

 long, with somewhat smaller 

 spikelets. The leaves are nar- 

 row, linear, j^ilose, pubescent, 

 both sides and sheaths re- 

 trorsely pilose. Type collected 

 "in Cordilleris chilensibus, 

 inque montanis Peruvi;:*." 

 (General distribution: Florida 

 to southern California. 

 :'KciMENS EXAMINED . — Florida : 

 Madison (R. Combs 247— a 

 form with somewhat pubes- 

 cent glumes). Alabama: Mo- 

 bile ( T. H . Kearney 16) . Texas: 

 Bexar County ((I. Jermy 229) ; 

 Hempstead (E. Hall 792); (J. 

 Reverchon 119 ); Dallas (J.Rev- 

 erchon 1105) ; Fort Clark (E. A. 

 Mearns 1273); Corpus Christi 

 (A. A. Heller 1497). Cali- 

 fornia: Mentone(J. B. Leiberg 

 3296 ) . Our specimens are like 

 specimens from the type collec- 

 tion in the Bernhardi herba- 

 rium at the St. Louis Botanical 

 Gardens (cf. Rept. Mo. Bot. 

 Gard. 10: pi. 54. /■ I. 1898) 

 except that the sheaths are 

 more pilose. 



30. BROMUS SUBVEIiUTINUS n.sp. (Fig. 32.) 



An erect, tufted perennial. Culm somewhat puberulent above, al)out 2.5-5 dm. 

 high, deiiMly clotlied at the base with the old sheaths. HheSiihs canescei it ; ligule about 

 1 mm. long, truncate, laciniate; blades ?2«rrou', linear, rather rigid, hecoming involute, 

 canescent and also pilose with spreading hairs, those of the culm 4-10 cm. 1( )ng, those 

 of the innovations longer. Panicle about 5-10 cm. long, narrow, erect, simple, 

 sometimes bearing Init a single sjiik-elet, or the lower branches in {)airs and about 

 1-3 cm. long. Spikelets 5-7 flowered, 2-3 cm. long, laterally compressed, becora- 



FiG. 32.—Bromus subvdntiiius : a, empty glumes with tw 

 florets; b, dorsal view of a flowering glume. 



