360 DESCRIPTIONS OF NEW SPECIES 



§1 Calliopsis. — Achenium compressed, flat, naked, incurved; stigma trun- 

 cated, the tip only pubescent. Exterior involucrum very short. Rays two- 

 coloured; leaves hipinnately dissected. 



20. Coreopsis tinctorid; Nutt. 21. Coreopsis car daminifolia; Decand. (un- 

 der Calliopsis. ) 22. Coreopsis Athinsoniana; Hooker. 



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. 



Hab. New Jersey, near the sea-coast. Stigmas truncated, scarcely pubescent. 



*DIODONTA. (Coreopsis 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- 

 chospermd; Mich. Awns as long as the discal florets, pilose with erect hairs. 



Diodonta mitis. Coreopsis mitis; Mich. Flor. Bor. Am,, Vol. II., p. 140. 

 Coreopsis ambigua; Nutt. in Journ. Acad. Nat. Sci. Philad., VII., p. 76. Awns 

 short, scarcely exserted. 



Hab. In Alabama. 



Diodonta aurea. Coreopsis aurea; Ait. Hort. Kew., Ed. 1, Vol. III., p. 252. 



Diodonta aristosa. Coreopsis aristosa; Mich. Flor. Bor. Am., Vol. II., p. 

 140. Awns very long and divaricate. 



Diodonta * leptophijlla; smooth, erect, dichotomously branched; leaves pseu- 

 dopinnate, with few, linear, and mostly entire segments, the terminal one elon- 

 gated; peduncle dichotomal, very long; achenium short, cuneate, scabrous, 

 with two short, rather smooth horns. 



