1907] HallCompositae of Southern California. 227 



involucres) in the Coast Ranges near San Luis Obispo (Palmer. 

 no. 261). 



2. T. glabrata Gray, Pacif. R. Rept. 11. pt. 2, 122, t. 5 (1855). 

 Stems branching to form rounded bushy plants 1 m. or less 



high: leaves early glabrate, mostly 5 to 10 mm. long, 3 to 6 in 

 each fascicle; the primary ones rigid-subulate, cuspidate, mostly 

 5 to 10 mm. long, early deciduous; axillary fascicled leaves soft 

 and pointless, persistent; leaves of sterile shoots linear-subulate, 

 appressed, without fascicled ones in their axils : heads in terminal 

 cymes or the cymose clusters sometimes racemosely disposed : in- 

 volucre 7 or 8 mm. high, white-tomentose or glabrate and green, 

 4-flowered; bracts 4 or 5, oblong, carinate: achenes densely vil- 

 lous : pappus copious, sordid. 



Lower and Upper Sonoran zones from the Mohave Desert to 

 Oregon and Utah: Rabbit Springs, Parish; Lancaster, Davidson; 

 Owens Valley, where common on low hills. 



3. T. stenolepis Greene, Bull. Calif. Acad. i. 92 (1885). 

 Stems about 6 or 8 dm. high, corymbosely much branched: 



herbage permanently white-tomentose with appressed wool : lower 

 primary leaves oblanceolate, tipped with a sharp mucro, about 

 2 cm. long; upper (and often all) primary leaves modified into 

 rigid spreading spines 2 to 3 cm. long ; secondary fascicled leaves 

 oblanceolate and 1 cm. or less long, or entirely wanting : heads in 

 close terminal cymes: involucre 10 to 12 mm. high, 5-flowered; 

 bracts 5, oblong, very thick and rigid, obtuse : achenes canescent 

 but glabrate : pappus comparatively coarse. 



Lower Sonoran Zone of the Desert Area from Antelope Val- 

 ley, Los Angeles Co., to Inyo Co. : Hesperia, San Bernardino Co.. 

 Sept., 1907, Edw. Hoykendorf; Fairmount, Los Angeles Co.. 

 Hall, no. 6712 ; Kernville, Purpus, no. 5651 ; Argus Mts., Purpus. 

 no. 5463 ; Cottonwood Ranch, Inyo Co., Brandegee. Ace. to Mrs. 

 Brandegee the type specimens were gathered a short distance 

 southwest of the Southern Pacific railroad between Cameron and 

 Mohave stations. 



4. T. spinosa H. & A., Bot. Beech. 360 (1840). 



A rigidly branched shrub 6 to 12 dm. high: stems densely 

 white-tomentose : primary leaves modified into rigid spines which 



