ASCLEPIADACEiE. (mILKWEED FAMILY.) 399 



smooth, with opposite heart-ovate and pointed long-pctioled leaves, and small 

 whitish flowers in racenic-like clusters, on slender axillary pcdunck's. (Dedi- 

 cated to ^1. Enden, an Austrian hotanist who collected in the Southern United 

 States early in the present century.) 



1. E. albida, Nutt. — River-banks, Ohio to Illinois, and southward: com- 

 mon. July - Sept. — Climbing- 8° - 1 2° high : leaves 3' - 5' wide. 



4. VINCETOXICUM, Moench. Vincetoxicum. 



Calyx 5-parted. Corolla 5-parted, wheel-shaped. Crown flat and fleshy, 

 disk-like, 5-10-lobed, simple. Anthers smooth, pods and seeds much as in 

 Asclepias. — Herbs, often twining. (Name composed of Vinca, the Periwinkle, 

 and toricum, poison. ) 



1. V. NIGRUM, Mccnch. (Black V.) More or less twining, nearly smooth ; 

 leaves ovate or lance-ovate ; flowers small, dark purple, in an axillary cluster, 

 on a peduncle shorter than the leaves. — Cambridge, Mass., &c. : a weed escap- 

 ing from gardens. (Adv. from Eu.) 



5. GONOLOBUS, Michx. Gonolobus. 



Calyx 5-parted. CoroHa 5-parted, wheel-shaped, sometimes reflexed-spread- 

 ing ; the lobes convolute in the bud. Crown a small and fleshy wavy-lobed ring 

 in the throat of the corolla. Anthers horizontal, partly hidden under the flat- 

 tened stigma, opening transversely. Pollen-masses 5 pairs, horizontal. Pods 

 turgid, mostly muricate with soft warty projections, sometimes ribbed. Seeds 

 with a coma. — Twining herbs or shrubs (ours herbaceous), with opposite heart- 

 shaped leaves, and corymbose-umbelled greenish or dark purple flowers, on pe- 

 duncles rising from between the petioles. (Name composed of ywi/os, an a)i(/le, 

 and Xo/3of, « pod, from the angled or ribbed follicles of some species.) 



1. G. Isevis, Michx. Nearly glabrous, or the stems and petioles sparingly 

 hirsute and finely pnbcrulent; cali/x and corolla (jlnhrous, the latter tapering-con- 

 ical in the bud, the expanded divisions lanceolate, yelloiclsh-fjreen ; pods ribbed, 

 smooth. ( Vincetoxicum gonocarpos, Walt. Periploca latc-scandens, Clayt. G. 

 macrophyllus, Michx., also Deaiisne, excl. syn. Jacq. & Bot. Mag. G. tiliaifo- 

 lius, Diraisiw.) — River-banks, Virginia, to Illinois and southward. July. 



2. G. obliquus, R. Br. Stems, petioles and often the ribs of the leaves 

 beneath hirsute with spreading viscid hairs ; calyx and corolla pubescent or pubern- 

 lent outside, the latter narrowconical-oblong in the bud, its divisions ligulato- 

 linear or lanceolate, obtuse, dark dull crini son-pur pie within ; pods copiously muri- 

 cate, ribless. (Cynanchum obliquum, Jacq., 1786. C. discolor, Sims, Bot. 

 May. Gonolobus hirsiitus, Ed. 2, &c. G. discolor, R. ^ S. G. macrophyllus, 

 Decaisne in part.) — River-banks, Penn. to Virginia. Aug., Sept. — Lobes of 

 the corolla nearly 6" long. Pod 5' long. 



3. G. hirsutus, Michx. ( Ap(5cynum hirsutum, A'l/Z:. ; perhaps Periploca 

 Carolinensis, Dill., and P. latc-scandens fl. ferrugineo, Clayt.; Vincetoxicum 

 acanthocarpos, Walt.; and' clearly Cynanchum Carolinense, Jacq.) Known 

 from the last by its short-ocate flmoer-bud.t, and the oval or oblong divisions of tlie 

 purple corolla (only about 3" long) ; perhaps occurs in S. E. Virginia. 



