AND GENERA OF PLANTS. 337 
Subtribe.—BACCHARIDE. 
Baccuants *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. 
Has. Banks of the Arkansa, nearly allied to B. glomeruliflora. More or less resinously punc- 
tate. Lato very obscurely three-nerved, attenuated into a petiole. 
Baccharis pilularis; Decanp., Vol. V., p. 407. 
+ 
a: 
Has. 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, whith causes 
excrescences on the eenches and hence, I suppose, arises the specific name. 
Baccharis Pingraa; Decanp., Vol. V., 
Has. In the vicinity of St. Diego, Upper sete Yi leaves and branchlets somewhat 
a Achenium with very few striatures. ‘ 
Pele 
e 
Subtribe—TARCHONANTHEA. 
= — * DIAPERIA. , 
Capitulum many-flowered, heterogamous, flowers all tubular, the rays femi- 
nine, slender, in several series; discal florets two or three, masculine, with a 
erenate, 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 withou 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 ao patois 
capituli cylindric-ovate.—(The name from Ava@epaa, to pass thi 
allusion to the proliferous inflorescence.) a 
vil.—4 kK 
