366 DESCRIPTIONS OF NEW SPECIES 
~HELIANTHUS. (Linn.) 
Helianthus lenticularis. Decanp. 
Has. Banks of the Platte and the waters of the west, generally. 
Helianthus *integrifolius; ©, more or less hirsute with appressed hairs; 
leaves nearly entire, below opposite, above alternate, ovate, or ovate-lanceolate, 
three-nerved, petiolate, obtuse or acute; stem few-flowered; sepals lanceolate- 
oblong, or ovate, acute, closely imbricated; rays about twelve, rather short; 
achenium villous. . gracilis; leaves denticulate, scarcely three-nerved; 
pals acuminate. | 
Has. With the above, a small and either dwarf species, sometimes slender, at other times robust, 
leaves on long petioles. Stem sometimes almost simple (perhaps a different species;) in others 
Capitulum pedunculate, about one and a half inches in diameter, or 
smaller. Rays sometimes styliferous, with abortive fruit, bearing three awns; palee of the recep- 
tacle ovate, abruptly acute; young achenium almost silky; disk brown. Allied to H. petiolaris, 
particularly 8, gracilis, but with short peremeree and opposite leaves, 
branching from. the base. 
Helianthus * silphioides; 2, hirsute and scabrous; leaves petiolate, broad 
ovate, subcordate, dilated, serrate, acute, below opposite, alternate above; up- 
per part of the stem naked, paniculate, subcorymbose; sepals oval, obtuse, 
closely imbricate; squame of the receptacle acute, somewhat three-toothed; 
achenium smooth, pubescent at the summit; rays acuminated. 
Has. In the plains of Arkansa, three or four feet high, and robust. Leaves nearly as wide as 
long, about three inches. Capituli in a branching corymb, branches two and three-flowered. Rays 
about twelve, acuminated, longer than the brown disk. Achenium spotted, subquadrangular, two 
awned. Discal florets cylindric, rather narrower at base.—Allied to HZ. atrorubens, but a much 
stouter and broader-leaved plant. 
Helianthus * pumilus; x, hirsutely pilose and scabrous; leaves ovate-lanceo- 
late, opposite, attenuated below, subpetiolate, nearly entire, and three-nerved, 
upper leaves lanceolate, alternate; involucrum hoary, hispid ; sepals imbricated, 
lanceolate, acute, as well as the receptacular palee; achenia smooth. 
acute, scabrous and somewhat softly pilose; peduncle one-flowered, terminal; sepals in nearly a 
simple series, oblong, a 
Has. Maldonado. (Dr. es Stem slender and wiry, about a foot long, sending off a few one-flowered 
branches towards the summit. Rays about ten to twelve, rather short. Achenium nearly smooth, with two awns, 
and numerous smooth squamelle. Receptacular palee linear-lanceolate, acuminate. 
