220 CICHOEIACEJE. 



2. PTILORIA, Raf. Ours stoutish and rather rigid tall annuals. 

 Leaves runcinate. Heads small; fl. pinkish or purplish, few in the head, 

 the ligules all equal. Involucre of several longer erect inner bracts, 

 and as many short appressed calyculate outer ones. Achenes truncate, 

 5-angled. Pappus a series of plumose bristles curving outward. 



1. P. virgata (Benth.), Greene. Eigid, virgate, 13 ft. high, glabrous 

 throughout and the herbage deep green: leaves runcinate: heads 34 

 lines long, subsessile along the naked upper part of stem and branches, 

 4 8 flowered: achenes subclavate or oblong, rugose-tuberculate between 

 the ribs: pappus clear white, plumose almost throughout. Sandy banks 

 and hills. Aug. Oct. 



2. P. cnuescens, Greene. More slender, paniculate, 24 ft. high; 

 stem and foliage hoary-tomentose when young, somewhat glabrate in 

 age: leaves lanceolate, more or less sinuate- or runcinate-pinnatifid: 

 achenes larger than in the last, and less tuberculate; pappus as white, 

 slightly longer and of fewer bristles. Mountain sides, and clayey banks 

 of streams, in exposed places. June Sept. 



3. KEMOSERIS, Greene. Stout annual, near Ptiloria, but decidedly 

 inclining to the corymbose in branching: flowers much more numerous 

 in the head: ligules white, unequal. Achenes tapering to a long beak 

 supporting the pappus; the rays of the latter not at all curved. 



1. H. Californica (Nutt.), Greene. Glabrous, the stem white, 23 

 ft. high, herbage glabrous and with a strong narcotic smell: leaves 

 oblong, pinnatifid, sessile and clasping: heads 1 in. wide when expanded: 

 outer achenes pubescent; plumose pappus sordid. On clayey banks 

 and slopes of wooded hills; common. June Sept. 



4. TRAGOPOGON, Theophr. Stoutish biennials with fusiform 

 edible root, leafy erect stems and large long-peduncled slender conic 

 involucres. Receptacle naked. Achenes muricate, long-beaked; the 

 beak supporting an ample pappus of setaceous bristles which are long- 

 plumose at base and naked above. 



1. T. POBBIFOLIUS, L. (SALSIFY). Leaves entire, long and grassy: 

 stem 2 4 ft. high: rays deep purple. Naturalized in waste lands; an 

 escape from the gardens. 



5. HYPOCILERIS, Vaillant. Plants leafy mostly at base of the 

 branching naked or leafy-bracted somewhat corymbose stems. Involucres 

 oblong -conic, erect in the bud ; bracts imbricated. Receptacle scarious- 

 chaffy, the chaff deciduous. Flowers yellow. Achenes oblong or 

 fusiform, 10-ribbed, glabrous or scabrous, at least the inner ones tapering 

 to a beak. Pappus a series of fine plumose bristles, often accompanied 

 by some outer naked ones. Weeds introduced from Europe. 



