PMUbertia. ASCLEPIADACE.'E. 87 



or boarded within. Crown of 5 flat or slender and distinct scales or processes, borne 

 either on the corolla or tiie column. Stigma with flat top or with a mere apiculation at 

 the centre. 



13. MELINIA. Calyx-lobes narrow and acute. Corolla with thin-edged lobes slightly 

 overlapping in the bud. Crown of 5 distinct fleshy scales at the base of the columai. 

 Stigma abruptly long-rostrate, the beak entire. 



14. VINCETOXICUM. Corolla rotate or somewhat campanulate, 5-parted ; the lobes 

 dextrorsely overlapping or neai'ly valvate in the bud. Crown on the short column or at 

 its junction with the t'orolla, cu])-sliaped or annular and usually G-lO-lobed or parted, or 

 of 5 distinct plane scales, not appendaged. Stigma with flat or obtusely conical top. 



Tribe II. GONOLOBE.E, Anthers usually Avith short if any scarious tip, and 

 borne on the margin of or close under the. disk of tht; stigma ; the cells opening 

 more or less transversely. PoUinia horizontal or nearly so, otherwise as in the pre- 

 ceding tribe, but usually smaller. 



15. GONOLOBUS. Corolla rotate or rarely campanulate, 5-parted or 5-lobed ; the lobes 

 dextrorsely convolute in the bud : crown annular or cupulate, entire or lobed, rarely di- 

 vided. Stigma flat-topped. 



1 . ASTEPHANUS, R. Br. {JtazHfuro^, crownless.) — Slender and small- 

 flowered herbaceous or sitffrutescent plants, chiefly of the southern hemisphere. 

 — Benth. & Hook. Gen. ii. 747. 



A. Utahensis, Engelm. Perennial from a tliiclc root, low, nearly glabrous : stems 

 filiform, twining: leaves filiform-linear, acute: short peduncles umbellately ;3-5-flowered : 

 corolla dull yellow, little longer than the calyx, campanulate (a line high and wide) ; the 

 lobes ovate, somewhat cucuUate with points inflexed, papillose-puberulent internally : fol- 

 licles long-acuminate : surface of the seed rough-granulate. — Am. Naturalist, ix. 349. — 

 Dry sandhills, St. George, S. Utah, Parrij. Ilardyville, Arizona, Pahmo'. 



2. PHILIBERTIA, IIBK., Benth. & Hook. (/. C. Philibert, author of 

 some French elementary botanical works.) — Perennial herbaceous or shrubby 

 twining plants (of warmer N. and S. America) ; with petiolate leaves, and usually 

 dull-colored or parti-colored fragrant flowers : peduncles uiTibellately several- 

 many-flowered : fl. summer. — Benth. & Hook. Gen. ii. 750. Sarcosfemma, as 

 to spec. Amer., IIBK., Decaisne in DC, &c. Corolla in our species deeply 5- 

 cleft or parted ( == Sarcostemma, IIBK), the lobes commonly ciliate. 



* Column manifest, rather longer than the tumid scales of the inner crown on its summit. 

 P. undulata, Gray. Low-twining, glabrous or cinereous-puberulent, pale : leaves 

 thickish, from lanceolate and gradually acuminate to linear from a hastateiy cordate base 

 (2 or .J inches long), the margins undulate-crisped : peduncle G-10-flowered, longer than the 

 petiole and pedicels: corolla dull purple, glabrous above, half inch in diameter; the lobes 

 ovate ; outer crown saucer-shaped : follicles 4 or 5 inches long. — Proc. Am. Acad. xii. 05. 

 Sarcostemma undulata, Tovi'.'Qot. Mex. Bound. 161. — W. Texas and New Mexico, Parn/, 

 Biyclow, Wrifjht, &c. 



-# # Column none or very short and inconspicuous: peduncles about equalling or surpassing the 

 plane leaves : follicles tomentulose or glahrate. 



P. Torreyi, Gray. Freely twining, densely pubescent with soft spreading hairs : leaves 

 cordate-lanceolate and acuminate or sagittate, an inch or more long: peduncle 10-15- 

 flowered: corolla apparently white, two-thirds to three-fourths inch in diameter; the lobes 

 little shorter than the pedicel, broadly ovate, obtuse, externally puberulent, strongly vil- 

 lose-ciliate, outer and inner crowns contiguous. — Proc. Am. Acad. xii. (54. Sarcostemma 

 drr/cms, Torr. I.e., not Decaisne. — Rocky hills, S. W. Texas, on the Rio Grande and its 

 tributary the Cibolo, Parri/, Biyclow. — P. ekgans is less pubescent, with smoother corolla 

 purple in part within, the lobes narrower, and a short coluum developed between the thick 

 and prominent outer crown and the inner. 



P. cynanchoid.es, Gray, 1. c. Tall-climbing (8 to 40 feet), glabrous or glabratc : leaves 

 fronni deeply cordate to sagittate or almost hastate, abruptly cuspidate or short-acuminate, 



