336 PROCEEDINGS OF THE AMERICAN ACADEMY. 
strikingly from the distinct dimorphism of the bracts, running with 
considerable uniformity through the whole Coreopsis series, as to 
deserve generic rank. The bracts are imbricated in two rows, sub- 
equal 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, Leptosyne pinnata 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 onas a new 
us 
nus. 
The relation of the groups in question would seem to be best shown 
thus: 
COREOPSIS L. (xépis bug, and drs likeness, from the form 
of the achene in the original species, C. lanceolata 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. calliopisidea), 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-toothed 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 corymbose-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. xvu. 
218 (1882), Syn. Fl. i. pt. 2. 299 (1884). Coreopsis sect. Leptosyne 
