RHAMNACE^. 45 



Synopsis of the Genera. 



1. Vltls. Leaves simple, heart-shaped, and variously lobed. 



2. Anipelop'sls. Leaves compound-digitate, of 5 serrate leaflets. 



I. VITIS, Tourn. Gkape. 



1. C. SBStlva'liS, Michx. (NoBTHERN Fox-Grape.) Leaves 

 and branches woolly. Berries large, dark purple or amber- 

 coloured. — Moist thickets. 



2. C. eOFdifO'lia, Miohx. (Frost Grape.) Leaves smooth 

 or nearly so, bright green on both sides, heart-shaped, 

 sharply serrate. Berries small, blue or black. Var. ripa'Pia, 

 Michx., has broader cut-lobed leaves. — Banks of streams. 



2. AMPEIOP'SIS, Michx, V IE gihia Creeper. 

 A. quinquefo'lia, Michx. A common woody vine in low 

 grounds. Leaves digitate, of 5 oblong-lanceolate leaflets. 

 Tendrils with sucker-like disks at the end, by which they 

 cling to walls, trunks of trees, etc. Fruit a small black 

 berry. 



Order XXVII. RHAMN A' CE.S;. (Buckthorn Family.) 



Shrubs with simple stipulate leaves, and small regular 



perigynous greenish or whitish flowers. Stamens opposite 



the petals, and with them inserted on the margin of a fleshy 



disk which lines the calyx-tube. Fruit a berry-like drupe, 



or a pod. 



Synopsis of tbe Genera. 



1. Rham'niis. Petals minute, or nOTie. Drupe berry-like. Calyx and 



disk free from the ovary. 



2. Ceano'tliiis. Petals white, long-clawed, hooded. Fruit dry, dehis- 



cent. Calyx and disk adherent to the base of the ovary. 



1. KHAM'SCS, Tourn. Buckthorn. 

 R. alnifo'lia, L'Her. A low erect shrub, not thorny, 

 with oval, acute, serrate leaves, and apetalous flowers. 

 Fruit a 3-seeded berry. — Swamps. 



a. CEANO'THIIS, L. New Jersey Tea. 

 1. C. America' nUS, L. A shrubby plant with downy 

 branches, and ovate, 3-ribbed, serrate leaves. Flowers in 

 wnite clusters at the summit of the naked flower-bT-anohes. 



