BLAKE. — - SPECIES HERETOFORE REFERRED TO LEPTOSYNE. 343 



entire or pectinately cut crustaceous wing, calvous or with two re- 

 trorsely hispidulous slender awns, often granular on one or both faces, 

 — Annuals or suffrutescent perennials, with opposite 1-2-pinnately 

 divided leaves, and small slender-peduncled heads (less than 2 cm. in 

 diameter including the rays) in somewhat ternate cymose clusters at 

 the ends of the branches. — Bot. Voy. Sulph. 28, t. 16 (1844); Gray, 

 Proc. Am. Acad. v. 162 (1861). Acoma Benth. 1. c. 29, t. 17 (1844). 

 Leptosyne sect. Coreocarpiis Gray, Syn. Fl. i. pt. 2. 301 (1884). — Three 

 species of the Sonoran region. — Well distinguished by inflorescence, 

 and by the involucre of few similar scales, not double as in all members 

 of the genus Coreopsis. 



* Herbaceous annuals. 



1. C. PARTHENioiDES Benth. Slender, 2-4 dm. high, branched 

 above, nearly glabrous, bearing few heads in somewhat ternate termi- 

 nal clusters; leaf-blades 2-4.5 cm. long on petioles nearly as long, 

 somewhat thickish, bipinnatifid, the primary lobes deltoid, 1-2 cm. 

 long, nearly as broad, entire or 3-4-lobed with broad divisions ; heads 

 5-6.5 mm. high, about 1 cm. broad including the rays; rays oval, 

 about 5, 5 mm. long, yellow, often drying whitish with purplish veins; 

 achenes oblong, crenate-margined, in the only specimens examined; 

 figured by Bentham as oval, shortly 2-awned, with imperfectly dis- 

 sected wing. — Bot. Voy. Sulph. 28, t. 16 (1844). Leptosyne parthe- 

 nioides Gray, 1. c. — Bentham's type came from Bay of Magdalena, 

 Lower California. The only specimens examined are: Sonora: 

 high in the mountains, Guaymas, Oct. 1887, Palmer 299. 



1^. C. PARTHENIOIDES Benth. var. heterocarpus (Gray) Blake, n. 

 comb. Leaves bi-tripinnatifid with finer divisions, the ultimate ones 

 nearly linear; margin of achenes entire and incurved or dissected into 

 lobes; awns sometimes present. — Coreocarpiis heterocarpus Gray, 

 Proc. Am. Acad. v. 162 (1861). Leptosyne heterocarpa Gray, Syn. Fl. 

 1. c. L. dissecta Gray, 1. c. (as to plant, not synonym). L. parthe- 

 nioides var. dissecta Wats. Proc. Am. Acad. xxiv. 56 (1889), as to 

 plant cited, not as to name-bringing sjynonym. Coreocarpiis invohttus 

 Greene, Pittonia, i. 290 (1889). — While C. heterocarpus Gray appears 

 to be merely a form of C. parthenioides, as long ago suggested by Dr. 

 Watson, indistinguishable by achenial characters alone, it nevertheless 

 differs sufficiently in foliar characters to retain varietal rank. C. 

 involutus Greene, of which no authentic specimen has been seen, is 

 judging from the description inseparable from this variety. Plants 

 collected by Brandegee on Xati\'idad Island and distributed as this 



