Leptosyne. COMPOSITE. 299 



115. HETEBOSPEBMUM, Cav. (Heterosperma. "Ercpos, other, in 

 sense of unlike, o-Trep/xa, seed.) Small or slender annuals (from the Mexican 

 border southward), mainly glabrous, branching ; with opposite pinnately or ter- 

 nately dissected or sometimes undivided leaves, and small heads of yellow flowers ; 

 the 3 to 5 rays little exserted. Cav. Ic. iii. 24, t. 2G7 ; HBK. Nov. Gen. & 

 Spec. iv. 245, t. 383, 384 ; DC. Prodr. v. 632. 



H. pinnatum, CAV. 1. c. About a foot high : leaves pinnately 3-7-parted into linear divis- 

 ions, which are either all entire or some of them again 2-3-parted : heads slender-peduncled, 

 about 3 lines long : outer involucre of 3 to 5 linear foliaceous bracts, hispidly ciliate at base,' 

 and overtopping the thin and oval striate inner bracts : outer akenes oval, at maturity cym- 

 biform or becoming oblong by inflexion of the callous wing, destitute of pappus ; innermost 

 commonly infertile, subulate, attenuate into a scabrous beak, bearing a pair of short decidu- 

 ous awns. Willd. Spec. iii. 2129; DC. Prodr. v. 632. //. tagetinum, Gray, PI. Feudl. 87, 

 & PI. Wright, ii. 91, a form with simply pinnate leaves often marked with glandular spots, 

 the awns sometimes wholly wanting or caducous. W. Texas to Arizona. (Mex.) 



116. LEPTOSYNE, DC., extended. (Aorroo-v'n/, slenderness; a name 

 applicable to the original, but not to most of the species here associated, except 

 as to the. leaves and their divisions.) -- Herbaceous or suffruticose plants (of 

 California and Arizona), smooth and glabrous ; with alternate or opposite and 

 usually rather fleshy ternately or pinnately divided or dissected leaves, and showy 

 pedunculate heads, both disk and ray flowers bright yellow. Habit of Coreopsis 

 (which it represents on the western side of the continent), but mostly with pistil- 

 late rays, and always with a ring on the tube of the disk-corollas or at its junc- 

 tion with the throat. Gray, Proc. Am. Acad. xvii. 218. Leptosyne, DC. Prodr. 

 v. 531, with Ay arista, DC. 1. c. 5G9. Coreocarpus & Acoma, Benth. Bot. Sulph. 

 28, 29, t. 10. 17. Leptosyne & Puqiopappus, Gray (Pacif. R. Rep. iv. 104), Bot. 

 Calif, i. 354. 



1. EULEFTOSYNE. Akenes callous-winged and commonly meniscoidal at 



o , 



maturity, a small or obscure saucer-shaped cup in place of pappus : rays pistillate 

 and commonly fertile, obovate, more or less 3-lobed : style-tips of the disk- 

 flowers capitellate either with or without a minute setiform cusp : low annuals, 

 with all but the lowest leaves alternate, and long or scape-like monocephalous 

 peduncles : bracts of the outer involucre linear or lanceolate, loose. Leptosyne, 

 DC. 1. c. 



L. Douglasii, DC. A span to a foot high, leafy only at or near the base : leaves once to 

 thrice parted into nearly filiform divisions : rays half-inch or more long: ring of the disk- 

 corollas usually distinctly bearded: akenes thickened at maturity (at least the more fertile 

 outer ones) and corky-winged, also corky-ridged down the inner face, roughened nearly 

 throughout with capitellate or clavate short and rigid bristles : pappus-cup somewhat con- 

 spicuous. Prodr. v. 531 ; Torr. & Gray, Fl. ii. 355 ; Gray, Bot. Calif, i. 356. L. Califvrnira, 

 Ntitt. Trans. Am. Phil. Soc. vii. 363, & L, Netcberryi, Gray, Proc. Am. Acad. vii. 358, Bot. 

 Calif. 1. c. ; state with young akenes or infertile inner ones thin-winged, and ring of corolla- 

 tube less bearded. California (from Monterey to San Diego and San Bernardino) and 

 adjacent Arizona ; first coll. by Douglas : flowering early. 



L. Stillmani, GRAY. Stouter, more leafy below: lobes of the leaves linear, a line or more 

 broad : ring of the di.sk-corollas beardless : akenes somewhat obovate, quite smooth and 

 naked on the back, becoming papillose or tuberculate on the inner face, at least along 

 the slightly ridged centre, the corky wing more or less rugose. Bot. Mex. Bound. 92, & 

 Bot. Calif, i. 356. California, from San Francisco Bay northward and eastward; first coll. 

 by StiUman. 



