1907] Hall. Compositae of Southern California. 259 



Hence only one constant character remains to separate the va- 

 riety from 8. virgata and even this the absence of the intercostal 

 groove is apparently somewhat variable. 



7. S. tomentosa Greene, Bull. Calif. Acad. ii. 152 (1886). 

 Ptiloria tomentosa Greene, Pitt. ii. 131 (1890). 



Stout, erect, 7 dm. or more high, from an annual or biennial 

 ( ? ) root : stem simple below, paniculately branched above : her- 

 bage white-tomentose when young, glabrate at least above : leaves 

 spatulate or lanceolate, sinuate-dentate or the lower runcinate- 

 pinnatifid, 7 cm. and less long : heads subsessile along the virgate 

 branches, " 5 to 8-fl owered ' ' : involucre 6 mm. high ; its principal 

 bracts equal, the outer calyculate ones minute : achenes 5-angled. 

 rugose-tuberculate between the angles : pappus of numerous white 

 bristles, plumose to the base, deciduous. 



Central parts of Santa Cruz Island, Jul.-Aug., 1886, Greene. 

 who only has collected it. 



8. S. exigua Nutt., Trans. Am. Philos. Soc. ser. 2, vii. 428 

 (1841). 8. coronana Greene, Bull. Calif. Acad. i. 194 (1885). 

 Ptiloria exigua Greene, Pitt. ii. 132 (1890). 



Plant 2 to 6 dm. high: stem with numerous ascending or 

 spreading branches, glabrous below, often minutely glandular- 

 pubescent above: lower leaves narrowly oblong, remotely lobed, 

 auriculate-clasping, the upper cauline small and bract-like : heads 

 scattered or somewhat paniculate, numerous : ligules at first rose- 

 color, soon turning sordid-yellow : involucre 6 or 7 mm. high, of 

 about 5 principal bracts, mostly 5-flowered : ligules 5 mm. long : 

 achenes linear-oblong, 5-angled, with a double row of tubercles 

 between the angles: principal pappus-bristles 8 to 18, plumose 

 above, naked on the lower third, commonly united into 4 or 5 

 clusters by their thickened bases which are sometimes setulose 

 or lacerate or some of the setae may split entirely away from the 

 central portion and form a row of short secondary bristles. 



A species chiefly of the Desert Area and eastward but ex- 

 tending to Redlands and to Monterey Co. and reaching the coast 

 in San Diego Co. The form with a secondary pappus of short 

 scabrous bristles formed by the splitting off of setae from the 

 principal ones comes from Riverside, Redlands, etc. Specimens 



