VITACEAK 207 



1. RHAMNUS L. 



Corolla present : sepals and stamens mostly 4. 



Drupe with 3-4 nutlets : leaf-blades of an ovate type. i. R. caihartica. 



Drupe with 2 nutlets : leaf-blades of a lanceolate type. 2. R. lanceolata. 



Corolla wanting : sepals and stamens mostly 5. 3. R. alnifolia. 



1. Rhamnus cathartica L. Buckthorn. (Man. p. 612 ; I. F./. ^jp/. ) 

 In dry soil, N. Eng., the Middle States and Ont. Introd. from Eu. — 

 Pennsylvcniia : Northampton, Easton ; Dei<aware. 



2. Rhamnus lanceolata Pursh. Lance-LEavED Buckthorn. (Man. 

 p. 612 ; I. F.y. 2392.) In moist soil, Pa. to Iowa, Neb., Ala. and Tex. — 

 Pe7insylvania : Franki^in ; Huntingdon. 



3. Rhamnus alnifolia L'Her. Alder-leaved Buckthorn. Dwarf 

 Al,DER. (Man. p. 612 ; I. F./. 2393.) In swamps, N. B. to B. C, N. J., 

 111., Neb., Mont, and Calif. — Pennsylvania : Lancaster; Huntingdon ; 

 Ci^EARFiELD ; Erie. 



2. CEANOTHUS L. 



1. Ceanothus Americanus L. New Jersey Tea. Red-root. (Man. 

 p. 613; I. F. y. 2396.) In dry open woods. Me. and Ont. to Man., 

 Kans., Fla. and Tex. — Pennsylvania : Tioga ; Monroe ; Northampton ; 

 Bucks ; Delaware ; Chester ; Lancaster ; Luzerne ; Franklin ; 

 Huntingdon ; Lawrence ; Allegheny. 



Family 2. VITACEAE Lindl. Grape Family. 



Hypogynous disk present : leaf-blades simple. i. ViTiS. 



Hypogynous disk wanting or obsolete : leaf-blades digitately 3-7-foliolate. 



2. Parthenocissus. 

 1. VITIS L. 



Leaf-blades woolly or copiously pubescent beneath. 



Lower surface of the leaf-blade felty-tomentose : berries 15-20 mm. in diam- 

 eter, murky. i. y. Labriisca. 

 Lower surface of the leaf-blade loosely tonieintose : berries 8-10 mm. in 

 diameter, not murky. 2. V. aestivalis. 

 Leaf-blades glabrous or nearly so. 



Leaf -blades glaucous beneath. 3. V. bicolor. 



Leaf-blades not glaucous beneath. 



Leaves with prominently 3-5-lobed blades. 4. V. vtilpina. 



Leaves with merely coarsely toothed blades, scarcely lobed. 

 High-climbing vine : leaf-blades mostly over 10 cm. long : berries sour. 



5. V. cordifolia. 

 Bushy vine : leaf-blades mostly less than 10 cm. long : berries sweet. 



6. V. rupestris. 



1. Vitis Ltbrusca L. Northern Fox Grape. (Man. p. 614; I. F. 

 f. 2398.) Thickets, N. Eng. to Ind., Ga. and Tenn. — Penjisylvania : 

 Monroe ; Bucks ; Delaware ; Chester ; Lancaster ; York ; Dau- 

 phin ; Franklin ; Huntingdon ; Westmoreland. 



2. Vitis aestivalis Michx. Summer Grape. (Man. p. 614; I. V.f. 

 2399.) In thickets, southern N. Eng. to Fla., southern Ont., Wis., and 

 La. — Pennsylvania : Northampton ; Bucks ; Delaware ; Chester ; 

 Lancaster ; York ; Dauphin ; Perry ; Philadelphia ; Allegheny. 



