218 COMPOSITE. 



the others straight, all subulate-spinescent at the tip: corollas lilac- 

 purplish or reddish, lobes shorter than the throat. Mt. Diablo and 

 southward. June, July. 



7. C. Yenustus, Greene. Stoutish, 3 ft. high, the foliage permanently 

 arachnoid-tomentose: heads large (2 in. high), terminating long and 

 almost naked pedunculiform branches: involucre glabrate, the many 

 subcoriaceous bracts with closely appressed base, and long lanceolate- 

 subulate abruptly shorl-spinescent tips: corollas bright crimson, the 

 segments longer than the throat: pappus-bristles barbellate above the 

 plumose part, the tips scarcely dilated. Foothills of the Mt. Diablo 

 Range. May, June. 



8. C. occidentalis, Nutt. Stout, 2 3 ft. high; peduncles stout, 

 rather short: leaves deeply pinnatifid, glabrate above, canescently 

 tomentose beneath: involucre subglobose; bracts straight, subulate-lanceo- 

 late, with short spines, the whole mass densely festooned with remarkably 

 distinct cobwebby hairs: corollas red-purple: anthers distinctly bisetose 

 and lacerate at base : pappus somewhat scanty. Sandy hills along the 

 seaboard only. May Aug. 



* * * Involucral bracts appressed, the slender spine at their tips more 

 or less abruptly spreading. 



9. C. hydrophilus, Greene. Bather slender, freely branching above, 

 35 ft. high; when young pale with a fine thin arachnoid pubescence, 

 in maturity green and glabrate: leaves not large, deeply cut into uniform 

 3-lobed segments: heads 1 in. high, somewhat clustered at the ends of 

 the branches; involucre ovate, the appressed-imbricate bracts with a 

 green and glutinous ridge toward the summit, and ending in a short 

 slender somewhat spreading spine. Brackish marshes about Suisun 

 Bay. July Sept. 



10. C. quercetorum (Gray), Greene.* Sparingly villous-arachnoid 

 when young, soon glabrate: stem stout, 1 ft. high or less, with few 

 rather large heads: leaves mostly petiolate, the larger 1 ft. long, pinnately 

 parted, the oblong divisions often 3 5-cleft, prickly: involucral bracts 

 coriaceous, closely imbricated in numereous ranks, the outer with short 

 prickles, the inner obscurely scarious at tip : corollas either dull-purple 

 or white: anther-tips narrow, very acute. Open grassy summits and 

 higher slopes of hills on both sides of the Bay. June, July. 



11. C. LANCEOLATUS, L. More or less villous or hirsute, seldom 

 cottony; 24 ft. high, stem and branches interruptedly winged by the 

 decurrent leaves, both leaves and wings prickly: heads nearly 2 in. high, 

 arachnoid-woolly at first, the bracts lanceolate, attenuate into slender 

 and rigid prickle-pointed spreading tips: fl. rose-purple. A most trouble- 

 some Old World weed, already abundant on this coast far northward, 

 only lately beginning to be seen occasionally in our district. 



