88 ASCLEPIADACE^. Pkilibertia. 



1 to 2i inches long : peduncle 15-25-90^616(1 : pedicels filiform and much longer than the 

 flowers : corolla white or whitish, scarcely half inch in diameter, smoothish ; the lohes 

 oblong-ovate, acutish, somewhat ciliate : crowns separated by a very short column. — Sar- 

 costemma cynanchoides, Decaisne in DC. Prodr. viii. 541. S. bilobum, Torr. 1. c, not Hook. & 

 Am. "? Gonolobus viridiflorus, Torr. in Ann. Lye. N. Y. ii. 219, not Nutt., and probably not 

 from " St. Louis." — Along rivers, Texas to S. Utah and Arizona. (Adjacent Mex.) 



P. linearis, Gray, 1- c. Slender, low twining or when young erect, puberulent or gla- 

 brate : leaves narrowly linear, acute or nearly so at both ends, short-petioled (an inch long) : 

 peduncle exceeding the leaves, 8-10-flowered : corolla yellowish, purplish, or whitish, barely 

 puberulent, a third inch in diameter ; the lobes ovate : crowns contiguous. — Sarcostemma 

 lineare, Decaisne, 1. c, & in PI. Hartw. 25. — S. Arizona. (Mex.) 



Var. hirtella. Chiereous-pubescent throughout with short spreading hairs, little 

 clnnbing : leaves as in the original species in form and size : sepals more slender. — Sar- 

 costemma heterophyllum, var. hirtelliim, Gray, Bot. Cahf . i. 478. — Fort Mohave, California, on 

 sandy river-banks, Cooper, &c. Hardyville, Arizona, Palmer. 



Var. heterophylla. More twining, glabrous, merely puberulent or above pubescent : 

 leaves 1 or 2 inclies long, 1 or 2 lines wide, some tapering into the petiole, some with 

 rounded and more with somewhat dilated or auriculate-cordate or truncate base : corolla 

 smoother, half inch in diameter. — Sarcostemma heterophyllum, Engelm. in Torr. Pacif. R. 

 Rep. V. 363, & Bot. Mex. Bound. 1. c. (with var.?); Gray, Bot. Calif. I.e. — California, 

 from San Luis Rey, San Diego, &c. to Arizona. 



P. viminalis. Gray, 1. c. Glabrous or nearly so, freely twining : leaves thickish, from 

 ovate-oblong to lanceolate, cuspidate-acuminate, obtuse or rounded at base, short-petioled 

 (an inch or two long), shorter than the many-flowered peduncle: corolla half an inch or 

 more in diameter, white ; the lobes ovate, puberulent outside. — Asclepias viminalis, Swartz, 

 Prodr. 53; Willd. Spec. i. 1270 (Sloane, Jam. t. 131, f. 1). Sarcostemma Brownii, G. F. 

 Meyer, Fl. Esseq. 139 ; Griseb. Fl. W. Ind. 419. 5. clausum, Decaisne, 1. c. S. crassifolium, 

 Chapm. Fl. 368. — Keys of Florida. (W. Ind. to Guiana.) 



3. PODOSTfGMA, Ell. (/loi^V, nodog, foot, and Gxiyfia, i. e. stalked 

 stigma.) — Sk. i. 326. Stylandra, Nutt. Gen. i. 170. — Single species. 



P. pubescens. Ell. 1. c. Perennial herb, a span to a foot high from a thickened root : 

 stem erect, simple or sparingly branched : leaves opposite, linear-lanceolate, nearly sessile : 

 peduncles terminal and axillary, short, umbellately several-flowered: flowers greenish- 

 yellow, fragrant, 4 lines long: follicles tomentulose. — Deless. Ic. v. t. 65; Chapm. Fl. 

 366. Asclepias pedicellata, Walt. Car. 106. Stylandra pumila, Nutt. 1. c. — Low pine barrens, 

 N. Carolina to Florida : fl. summer. 



4. ANANTHERIX, Nutt. (Composed of a, privative, and avOsoi'E, awn, 

 i.e. destitute of the horn of Asclepias.) — Single species, being Ananlherix, 

 Nutt. Gen. i. 169, not of Trans. Am. Phil. Soc. ser. 2, v. 201, except as to the 

 first species. 



A. connivens. Gray. Stem erect, 2 feet high from a perennial root, minutely pubes- 

 cent above: leaves opposite, sessile, oblong (1| to 2| inches long), or the uppermost small 

 and lanceolate, transversely veined, rather fleshy : umbels 2 to 6 along the naked summit 

 of the stem, several-flowered : lobes of the greenish corolla ovate, 5 lines long : hoods 

 whitish, incurved-conniving over the stigma ; a pair of small and narrow internal appen- 

 dages before the base of each : hyaline anther-tips elongated: follicles not seen. — Proc. 

 Am. Acad. xii. 66. Asclepias connivens, Baldw. in Ell. Sk. i. 320 (1817). Anantherix viridis, 

 Nutt. Gen. 1. c. (1818), but not Asclepias viridis, Walt. Acerates connivens, Decaisne in DC. 

 Prodr. viii. 521. — Wet pine barrens of Georgia and Florida : fl. summer. 



5. ASCLEPIODORA, Gray. (Jia-ATjmdg and dmQov or dcoQsd, the gift 

 of Asclepias.) — Perennial herbs (of Atlantic N. America), rather low and stout. 

 often decumbent ; distinguished from Asclepias by the anther-wings and hood, the 

 latter with a crest answering to the horn of that genus, from the original Anan- 



