320 DESCRIPTIONS OF NEW SPECIES 



Hab. With the above, for which I had at first confounded it, but the flowers are larger and not 

 perfectly yellow, the branches more slender and open, the leaves somewhat longer, and a little 

 broader. Involucrum turbinate, receptaculum narrow. The rays often, but not always, with two 

 lower, strap-shaped, narrow segments, opposed to the bifid tipped liguli. The same thing, though 

 less distinct, occurs in the preceding species, Discal florets deeply cleft, campanulate ; anthers and 

 stigmas much exserted, filiform, acuminate, hirsute. Achenium, when young, hirsute, and appa- 

 rently almost cylindric. This species is so glutinous as to stick to the paper, and leave its im- 

 pression behind. 



Obs. — A very remarkable genus, altogether peculiar in habit, resembling 

 some microphyllous shrub of the Cape of Good Hope. 



*ISOCOMA. 



Capitulum homogamous, many-flowered, (twenty;) florets subcampanulate, 

 deeply five-toothed. Branches of the stigma with an ovate apex, pubescent 

 externally. Receptacle alveolate, dentate. Involucrum imbricate, inversely 

 conic, scales membranaceous on the margin. Achenium subterete, serice- 

 ous; pappus pilose, copious, scarcely scabrous. — A stout perennial or suffru- 

 ticose plant of California, with the aspect of a Vernonia, but the flowers yel- 

 low, in terminal corymbose clusters. Leaves alternate, cuneate-oblong, 

 sharply serrate, rather small and crowded. — (So called from its equal 

 flowers.) 



Isocoma * Vernonioides. 



Hab. In marshes near the sea, at St. Barbara, Upper California. Common. Flowering in 

 April and May. One to two feet high, smooth, except the upper part of the stem, which is some- 

 what tomentose. Leaves about an inch long, by two to three lines wide, crowded in the axills, 

 rather succulent, linear-oblong or cuneate, acute, sharply serrate, the serratures ending in bristly 

 points ; flowers terminal, conglomerate, in sessile or pedunculated clusters, bright yellow. Al- 

 lied to Lessingia, but with the florets wholly similar. Also to the section Aplodiscus of Aplopap' 

 pus, in Decand., Vol. V., p. 350, yet the stigma appears to be wholly different. 



*ERIOCARPUM. 



Capitulum homogamous. Florets tubular, four to five-toothed, closed. Stig- 

 mas lanceolate, hirsute. Involucrum hemispherical, imbricate, the scales 

 unequal, rigid, membranaceous on the margin. Receptaculum flat, alveo- 



