360 DESCRIPTIONS OF NEW SPECIES 
§ CaLLiopsis.—Achenium compressed, flat, naked, incurved; stigma trun 
cated, the tip only pubescent. Exterior involucrum very short. Rays two- 
coloured; leaves bipinnately dissected. 
20. Coreopsis tinctoria; Nutr. 21. Coreopsis cardaminifolia; DEcAND. (un- 
der Cauuiopsis.) 22. Coreopsis Atkinsoniana; HooKeEr. , 
23. Coreopsis rosea; smooth, stem trichotomous; leaves linear, narrow and 
acute, opposite, entire, rarely trifid; rays unequally three-toothed, (rose-red ;) 
peduncles slender, rather long; achenium immarginate, entire, naked, curved. 
Has. New Jersey, near the sea-coast. Stigmas truncated, scarcely pubescent. 
*DIODONTA. (Corgorsis of authors.) 
Coreopsis, but with the outer involucrum as long, or longer than the inner, 
from eight to twenty-four leaved, the inner about eight-leaved. Achenium 
cuneate, compressed, flatly four-sided, immarginate, with two cornute, acute, 
hispid, but not retrorse teeth. Rays nearly entire. —Annuals or biennials, 
usually with pseudopinnated, opposite leaves, mostly serrated, rarely entire. 
Intermediate between Coreopsis and Bidens, andwith much the habit of the 
latter —(Named in allusion to the pappus.) 
Diodonta coronata. Coreopsis coronata; Linn., (fide GRay.) Coreopsis tri- 
chosperma; Micu. Awns as long as the discal florets, pilose with erect hairs. 
Diodonta mitis. Coreopsis mitis; Micu. Flor. Bor. Am., Vol. IL., p. 140. 
Coreopsis ambigua; Nutt. in Journ. Acad. Nat. Sci. Philad., VIL., p. 76. Awns 
short, scarcely exserted. 
Has. In Alabama. : 
Diodonta aurea. Coreopsis aurea; Air. Hort. Kew., Ed. 1, Vol. IIL., p. 252: 
Diodonta aristosa. Coreopsis aristosa; Micu. Flor. Bor. Am., Vol. II., p. 
140. Awns very long and divaricate. 
Diodonta * leptophylla; smooth, erect, dichotomously branched; leaves pseu- 
dopinnat e, with few, linear, and mostly entire segments, the terminal one elon- 
cate ; peduncle dichotomal, very long; achenium short, cuneate, a 
with we short, rather smooth horns. : 
