438 DESCRIPTIONS OF NEW SPECIES 



SONCHUS. (Cassini, Decand.) 

 Sonchus fallax? ^. * Calif ornicus. 



Hab. In Upper California, around St. Diego. Dentures of the leaves, which are pinnatifid, 

 deep and pungently spinulose ; achenium smooth and even, elliptic, alated, puberulous on the mar- 

 gin. Probably a distinct species, though so similar to the present as not to be distinguishable, ex- 

 cept by the pungency and length of the marginal spines, a,nd the alated achenia. 



Sonchus * tenuifoUus; o, smooth; leaves bipinnatifid and pinnatifid, auricu- 

 late at the base; segments few, hnear-lanceolate, spinulosely serrulate, the up- 

 per simply pinnatifid, with linear, subulate segments; involucrum caliculate, 

 smooth; achenium substriate, transversely rugose. 



Hab. In Upper California, round St. Diego, in shady ravines, among rocks. A very distinct 

 species. Primary divisions of the leaves, when bipinnatifid, with a single pair of segments, central 

 or terminal segments usually elongated and acuminate; divisions of the lower leaves obtuse. 

 Involucrum scarcely tumid. Stem slender, about two feet high. Leaves three or four inches 

 long, of a very thin consistence, as in S. tenerrimus. 



Subtribe *Andryale^. 



Receptacle naked or fimbriliferous, sometimes with the margin paleaceous. 

 Pappus white, usually double, the inner deciduous, filiform, barbellate to- 

 wards the base, where it adheres in a circle, the outer a minute paleaceous 

 crown, Achenium erostrate, striate, angular or cylindric. 



Andryala Ragusina, A. varia, A. sinuata, A. integrifolia, and proba- 

 bly other species. In these, except the first, the outer pappus is obscure, and 

 the salient summits of the ribs of the achenium resemble the outer pappus: 

 these, with a very deciduous and much less barbellated pappus, &c., ought to 

 be restored to the genus Voightia, of Roth. 



*LEPTOSERIS. 



Capitulum many-flowered, (forty, or more.) Involucrum campanulate, cali- 

 culate; sepals distinct to the base, linear-lanceolate, in a single equal series, 

 the margin membranaceous; caliculum small, of about eight unequal bractes. 

 Receptacle naked. Achenium finely striate, somewhat attenuated above. 



