AND GENERA OF PLANTS. 381 



ray two. Four to six inches high, nearly smooth, except the young shoots and invohicrum. 

 Receptaculum conic, 



Burrielia *parviJlora; somewhat pubescent; very much branched and many- 

 flowered; leaves long and almost filiform; rays and sepals about eight; rays 

 oblong, very short; acheniura minutely scabrous. 



Hab. With the above. Leaves scarcely a quarter of a line wide. Stem much branched from 

 the base ; peduncles slender and very long. Involucrum smooth, divisions lanceolate. Receptacle 

 conic. Pappus three or four-leaved, long-awned, in the ray two-leaved and similar. Obs. In all 

 these species the discal florets are campanulate with a narrow, tube, the border with five acute 

 erect teeth, scarcely, if at all, pubescent. 



§. I. *AMPHIACHiENIA. — PappUS 710716. 



Bu77ielia *hi7suta; erect, hirsute; leaves very long, linear and acute, some- 

 times here and there incise; peduncles elongated; sepals and rays ten to twelve; 

 rays oval, as long as the disk. 



Hab. St. Barbara, Upper California. Achenia compressed and scabrous. Six to twelve inches 

 high, below smooth, with the radical leaves very narrow. Stem leaves, about two inches long, 

 and a line wide. Scarcely distinguishable from B. gracilis, except by the absence of pappus. 



*PTILOMEIlIS. 



Capitulum heterogamous, many-flowered; rays feminine, elongated, slightly 

 three-toothed. Involucrum subcampanulate, many-leaved, in nearly a sim- 

 ple series, (ten to fifteen.) Sepals lanceolate, embracing the radial ache- 

 nia. Receptacle conic, naked or villous. Achenium slenderly conic, an- 

 gular, hirsute, attenuated at base. Pappus extremely various, many-leaved, 

 paleaceous, (eight to twelve,) or none! apex awned or obtuse, fimbriate; in 

 the ray smaller, formed simply of a short, multifid crown, or with the addi- 

 tion of one or two awns. Discal florets hermaphrodite, campanulate, flve- 

 toothed, externally, as well as the tube, glandularly pubescent. Stigma ob- 

 tuse, short, reflected, and pubescent. — Annual herbs of California; much 

 branched; leaves opposite, once or twice pinnatifid with long, capillary seg- 

 ments; flowers terminal, pedicellate, golden yellow. The whole plant 

 clothed with a slender, soft, glandular pubescence, which is aromatic. Al- 

 VII.— 4 V 



