GRASS FAMILY 89 



cate awns between the ciliate lobes of the apex; lateral spikelets similar, nar- 

 rower, the glumes less awned at the tip, the second floret similar to the first. 



Mohave and Colorado deserts, east to Arizona and south into Mexico. 



Locs. — Palm Springs, Parish 414.5; Whitewater, Parish Bros. 880; Newberry, Chase .5787; 

 Barstow, Hall <f- Chandler 6844; Mountain Spring, Srhocnfeldt 3082; San Felipe, Brandegee 

 89; San Jacinto Mts., Eall 2118. 



Eefa. — Pleukaphis rigida Thurb. in Wats. Bot. Cal. 2: 293. 1880. Eilaria rigida Benth.; 

 Scribn. Bull. Torr. Club 9: 33. 1882. 



2. P. jamesii Torr. Galleta. Culms glabrous, the nodes villous; sheaths 

 glabrous or slightly scabrous, sparingly villous around the short membran- 

 aceous ligule; blades mostly 1 to 2 inches long, 1 to 2 lines wide, rigid, soon 

 involute, the upper reduced; spikelets 3 to 4 lines long, long-villous at base; 

 glumes of central spikelet pubescent, cuneate, 2-lobed, the lobes 2 or 3-awned, 

 the central nerve between, extending from below the middle into an awn some- 

 what longer than the others, the awns all minutely plumose ; lemma erose at 

 apex, glabrous, 3-nerved, the nerves parallel, the central extending into a 

 short awn ; glumes of lateral spikelets narrow, pubescent, the first unsym- 

 metrical, 5-nerved, the second nerve on one side extending into a dorsal awn 

 from below the middle, the apex unequally 2-lobed, the sinus extending down 

 about half-way to the point of departure of the awn, the lobes minutely ciliate ; 

 second glume 5-nerved, awnless, entire, ciliate, conduplicate around the floret; 

 lemma as in fertile spikelet; stamens 2. 



Deserts of Inyo Co. : Argus IMts., Hall & Chandler 7086 ; Coso Mts., Coville & 

 Funston 915. Extends east to Wyoming and Texas, and south into Mexico. 



Refs. — Pleukaphis jamesii Torr. Ann. Lye. N. Y. 1 : 148. pi. 10. 1824. Silaria jamesii 

 Benth. Jour. Linn. Soc. Bot. 19: 62. 1881. 



Tribe III. PANICEAE. 



5. DIGITARIA Scop. 



Spikelets with 1 perfect flower, sessile or short-pedieeled, solitary or in 2's 

 or 3's, in 2 rows on 1 side of a continuous narrow or winged rachis, forming 

 slender spike-like racemes, aggregated toward the summit of the culm. Glumes 

 1 to 3-nerved, the first small, sometimes obsolete. Sterile lemma 5-nerved, 

 membranaceous. Fertile lemma leathery-indurated, papillose-striate, with a 

 flat hyaline margin. Annual or perennial, mostly weedy grasses with subdigi- 

 tate inflorescence. — Species about 50, mostly natives of the warmer parts of the 

 Old World, several species being introduced weeds in the New World. (Greek 

 digitus, a finger.) 



]. D. sanguinalis Scop. Crab-grass. Annual, usually much-branched at 

 base; culms 1 to 3 feet long, genieulate-spreading, or creeping and rooting at 

 the nodes, the flower-stalks more or less erect; sheaths more or less papillose- 

 hirsute; blades lax, 3 to 5 inches long. 2 to 5 lines wide, often pilose; racemes 

 3 to 12, subdigitate, 2 to 5 inches long; rachis with lateral angles winged; 

 spikelets in pairs, IY2 to 1% lines long, usually appressed-pubescent between 

 the smooth or scabrous nerves; pedicels angled; first glume minute; second 

 glume about ^(^ ^s long as the spikelet. 



A native of the Old World, now a common weed in the warmer parts of the 

 western hemisphere. Cultivated soil and waste places, central and southern 

 parts of the state, especially in the interior valleys. 



Refs. — DiGiTARiA SANGUINALIS Scop. Fl. Cam. ed. 2. 1: .52. 1772. Panicum sanguinale 

 h. Sp. PI. 57. 1753; Thurb. in Wats. Bot. Cal. 2: 258. 1880; Davy in Jepson, FI. W. Mid. 

 Cal. 31. 1901. Syntherisma sanguiimlis Dulac. Fl. Haut. Pyr. 77. 1867; Abrams, Fl. Los Ang. 

 23. 1904. 



