VlTACEAE. 



225 



Pabthenocissus. Virginia Creeper. 

 (Family Vitaceae). 



Somewhat fleshy woody climb- 

 ers: deciduous. Stems terete, 

 moderate or rather slender: pith 

 relatively large, continuous, green- 

 ish and large-celled in the inter- 

 nodes, whiter and more compact 

 at the swollen nodes. Buds mode- 

 rate, not superposed, but fre- 

 quently collaterally branching in 

 development, sessile, round-coni- 

 cal, with 2 or 3 exposed scales, the 

 end-bud absent. Leaf-scars alter- 

 nate, half-round or nearly cir- 

 cular: bundle-traces about a dozen, 

 rather indistinct, in an ellipse: 

 stipule-scars long and narrow. 

 Tendrils opposite the leaf - scars, 

 absent from every third node. 

 (Ampelopsis; Psedera). 



Winter-character references: 

 Parthenocissus quinquefolia (Am- 

 pelopsis hederacea). Bosemann, 41; Hitchcock (3), 10; 

 Schneider, f. 122. P. vitacea (A. quinquefolia). Brendel, 27, 

 pi. 4. P. tricuspidata. Schaffner & Tyler, Ohio Naturalist, 

 1:32. 



1. Nearly or quite glabrous. 2. 

 Persistently distinctly pubescent. 4. 



2. Tendrils rarely with suckers, long. (1). P. vitacea. 

 Suckers abundant at ends of the tendrils. 3. 



3. Tendrils rather long. P. quinquefolia. 

 Tendrils and internodes short. (Boston ivy). P. tricuspidata. 



4. Pubescence coarse: not rooting. P. quinquefolia Engelmannii. 

 Pubescence downy: rooting. P. quinquefolia Saint-Paulii. 



