220 CICHOBIACE.E. 



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. Bigid, virgale, 1 — 3 ft. high, glabrous 

 throughout and the herbage deep green: leaves runcinate: heads 3 — 4 

 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. canescens, Greene. More slender, paniculate, 2 — 4 ft. high; 

 stem and foliage hoary-tomenlose 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 bank's 

 of streams, in exposed places. June — Sept. 



3. NEMOSERIS, 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, 2 — 3 

 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. pobeifolius, L. (SaiiSift). Leaves entire, long and grassy: 

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

 escape from the gardens. 



5. HYPOCH.ERIS, 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. 



