w 



428 Vail: Studiks i\ the Asclepiadaceae 



The type of this species is from Illinois, where it is not infre- 

 quently met with on river-banks and in thickets. It has. a wide 

 range, eastward and southward. The specimen quoted from 



fc> 



'/ 



Brown, Illustrated Flora, 3: iS, is in fruit and is the true Gonolo- 

 bus lacvis Michx. (Herb. Columbia University). 



A second species Gonolobus volubilis {Ncniaturis vohtbilis 

 Turcz. Bull" Soc. Nat. Imp. Mosc. 21: 254. 1S48. E)islcma 

 zwhibilis Karst, Fl. Columb. 2: 117. PI. 162. 1866) occurs 

 near Pt. Cabello, U. S. of Colombia. 



ViNCETOXicuM suHEROSUM (L.) Britt., Mem. Torr. Bot. Club, $: 



■ 



266. 1894. 



* 



Cynaiicliuui subcrosuni L. Sp. PI. 212. 1753. Dill. Hort. Elth. 

 300. //. 22g. / 2^6, excluding Hort Cliff and Gron. 27. 



Go)iolobiis subcrosus R. Br. Ait. Hort. Kew. ed. 2, 82. 181 1. 



Dr. Gray * has written the history of this species and in addition 

 to his notes it may be of interest to pouit out that the plant 

 '' Apocymun scamieus fruticosiiDi fiDigoso corticc Brasiliaoium'' 

 Hcrm. Parad. 53 is probably the plant since referred to Ibatia^ and 

 is not the specimen of the Hortus Cliffortianus which resembles it 

 only as to the corky, ridged bark of the stems. The Cliffort i:>lant 

 can be seen in the Herbarium of the Britisli Museum and is diffi- 

 cult to identify as it is a mere fragment, but the character of the 



* 



5tem should make it easily recognizable were there more available 

 material of the same species for comparison, 



I venture to describe the following species as new. 



Vincetoxicum Floridanum. 



Puberulcnt throughout. Stems very slender, hirsute with few 

 short, scattered hairs : leaves opposite ; petioles 5-20 mm. long, 

 angled ; blades ovate, 2-5 cm. long, cordate, tapering to the acumi- 

 nate apex, the basal lobes rounded, with open sinus, about equally 

 puberulent with a fine soft pubescence on both surfaces; midvein ob- 

 scurely bi-glandulose at the base above : racemes about the length 

 of the petioles; pedicels 12 mm. long: calyx very small; seg- 

 ments 2 mm. long, linear-lanceolate, with a subulate gland in each 

 ^inus : corolla dull greenish-purple, 5 -parted to a little below the 



* Troc. Am. Acad. 12: 75. 1876. 



