Vail : Studies in the Asclepiadaceae 429 



middle ; segments linear-lanceolate, acute, 3-5 m. long, somewhat 

 fleshy, minutely puberulent, on the outer surface, glabrous within ; 

 crown red-purple, saucer-shaped, with 5 broad undulations each 

 bidentate at the callous thickened apex, and a smaller tooth on 

 each side below the middle : stigma depressed, not 5-angled : pol- 

 linia oblong, the caudicles broad and apparently not twisted ? Fol- 

 licles not seen. 



East Florida : Dr. Leavenworth. 



The specimen from which this description has been drawn is 

 in the Herbarium of Columbia University and was labeled by Dr. 

 Torrey, Gonolobus " jiia:rop/ijllus." It was seen by Dr. Graj' 

 when he was working on the Asclepiadaceae for the Synoptical 

 Flora and bears his note to the effect that it has "short denticu- 

 late lobes" and on the Synoptical Flora label the doubtful one of 

 "seemingly Gonolobns Carolincnsisy It differs however from 

 that species, as elsewhere ticketed by Dr. Gray in its much smaller, 

 greenish flowers, and the crown which has not the regular divisions 

 of that of Vincetoxiciiin Carolinensis, but especially in the inflores- 

 cence which is irregularly racemose, whereas that of V.Carolinensis 

 is more cymose and much longer pedicellcd. 



Vincetoxicum crenatum 



A twining vine. Stems somewhat angled, papillose-puberulent 

 and retrorsely hirsute with scattered short hairs : lea\es opposite, 

 on slender, striate, 3-5 cm. long petioles ; blades yellowish-green, 

 6-9 cm. long, ovate, rather long-acuminate at the apex, cordate, 

 basal lobes rounded with open or closed sinus, papillose-puberu- 

 lent on both surfaces, paler beneath : inflorescence sub-corymbose ; 

 peduncles 5-8 cm. long, 4-10-flowered ; pedicels slender, 8-15 

 mm. long, 1-2 bracteolate at base : calyx-segments ovate, acutish, 

 puberulent outside, ciliate, glabrous, and with a subulate gland in 

 each sinus within: corolla 13-14 mm. long, dull yellowish pur- 

 ple, rotately spreading, ovate-conic in bud ; segments linear-ob- 

 long, acutish, puberulent outside, glabrate within and vertically 

 reticulated, sparingly and minutely hirsute below the sinus, trans- 

 versely wrinkled and glabrous in the short tube : crown shallow, 

 saucer-shaped, 5-crenate ; lobes rounded, not exceeding the an- 

 thers, each with a short, barely free internal process or appendage 

 at about the middle ; process truncate at the apex : stigma 5-an- 

 gled, not depressed : anther-appendages small, fleshy ; pollinia 

 obliquely semi-orbicular, saccate and broader at the summit, 

 dented at the angled base, caudicles and corpuscles short. Follicles 

 not seen. 



