AND GENERA OF PLANTS. 337 



Subtribe.— 5^ C CHARIDEjE. 



feACCHARis ^salicifolia; shrubby, smooth, branches angular, leaves mostly ob- 

 long, or oblong-lanceolate, subdenticulate, uppermost nearly linear, entire, vis- 

 cid ; capituli sessile, clustered, involucrum ovate, as well as the smooth scales. 



Hab. Banks of the Arkansa, nearly allied to B. glomeruliflora. More or less resinously punc- 

 tate. Leaves very obscurely three-nerved, attenuated into a petiole. 



Baccharis pilularis; Decand., Vol. V., p. 407. 



Hab. Near St. Diego, Upper California, and Monterrey. In my specimens of the fertile plant 

 the leaves are often strongly denticulate, three-fourths of an inch long, by half an inch in width ; 

 the capituli solitary, or by threes, at the ends of the branchlets, and sometimes, also, aggregated 

 into a considerable panicle. Achenia smooth, with ten grooves, the pappus of moderate length. 

 A shrub three or four feet high. It appears to be subject to the attack of some insect, which causes 

 excrescences on the branches, and hence, I suppose, arises the specific name. 



Baccharis PingrcBa; Decand., Vol. V., p. 159. 



Hab. In the vicinity of St. Diego, Upper California. Young leaves and branchlets somewhat 

 glutinous. Achenium with very few striatures. 



^uhtxihQ.—TARCEONANTHEJE. 



*DIAPERIA. 



Capitulum many-flowered, heterogamous, flowers all tubular, the rays femi- 

 nine, slender, in several series; discal florets two or three, masculine, with a 

 crenate, four-toothed border. Receptacle flat, wholly paleaceous, the palea 

 obtuse, exterior chaffy, the interior lanuginous, separately involving the dis- 

 cal florets. Involucrum consisting of mere leafy, irregular bractes. Ache- 

 nium compressed, oboval, smooth, and without pappus. — A small, tomentose 

 annual, with entire, sessile leaves, the stem simple, branching simply from 

 the base, or terminating in a proliferous capitulum; the involucrum irregu- 

 lar; flowers in sessile clusters, made up of conglomerations of five capituli, 

 imbedded in a dense cottony tomentum, interspersed with leafy bractes; 

 capituli cylindric-ovate. — (The name from Aiatsgpaa, to pass through. In 

 allusion to the proliferous inflorescence.) 



VII. — 4 K 



