336 PROCEEDINGS OF THE AMERICAN ACADEMY. 



strikin<^ly from tlie distinct dimorphism of the bracts, running with 

 consideral)le uniformity through the wliole Coreopsis series, as to 

 deserve generic rank. The bracts are imbricated in two rows, sub- 

 ec^ual and all similar, subherbaceous, and ovate, which in connection 

 with the cymosely panicled small heads makes the genus easy of recog- 

 nition. 



A scapose Mexican perennial, Lrpiosync pinnaia Robinson, described 

 from material without ripe fruit and referred to this genus with con- 

 siderable doubt, proves to confirm in achenial characters the distinct- 

 ness already suggested by habit and is described further on as a new 

 genus. 



The relation of the groups in question would seem to be best shown 

 thus : 



COREOPSIS L. (/vopis bug, and 6\pLs likeness, from the form 

 of the achene in the original species, C. lanccolata L.) Heads radiate 

 or rarely and abnormally discoid, the flowers all yellow; rays neutral 

 or styliferous and fertile or rarely sterile, disk-flowers mostly fertile. 

 Involucre double, scales of each series slightly connate at base; the inner 

 membranaceous, 1-2-rowed, brown or yellow; the outer narrower (except 

 in C. calliop^sidea), herbaceous, usually shorter than the inner. Recep- 

 tacle flat or nearly so; pales flat, membranaceous. Ray-florets ligu- 

 late, entire or 2-3-dentate; disk-florets regular, tubular, with slightly 

 enlarged throat and (4-)5-tootlied limb, often with a thickened gla- 

 brous or pilose ring at base of throat. Anthers entire or barely bi- 

 dentate at base. Style-tips truncate or with short subulate hispid 

 appendages. Achenes obcompressed, sometimes meniscoid and much 

 thickened on one face, orbicular to oblong, those of the ray when 

 fertile commonly broader than the others, glabrous or pubescent, 

 sometimes villous on the margins, wingless or with a chartaceous wing 

 sometimes pectinately lobed, epappose or with two teeth, short ciliate 

 scales, or glabrous or upwardly hispidulous awns or scales, or with a 

 small cupule in place of pappus. — Herbs or rarely shrubs, glabrous or 

 pubescent. Leaves alternate or usually opposite, undivided and 

 entire or toothed, or ternate, or usually ternately or pinnately dis- 

 sected. Heads of medium size, solitary or coryml)ose-panicled.^ 

 Gen. 263, no. 670 (1737), and Sp. PI. ii. 907 (1753), in part. 



Subgenus Leptosyne (DC.) Blake, n. comb. Rays styliferous, 

 mostly fertile, rarely neutral in the section Pugiopappus; disk-flowers 

 usually with a thickened and generally hairy annulus at base of throat. 

 — Leptosyne DC. Prod. v. 531 (1836); Gray, Proc. Am. Acad. xvii. 

 218 (1882), Syn. Fl. i. pt. 2. 299 (1884). Coreopsis sect. Leptosyne 



