WOODY PLANTS OF MANHATTAN 



2. Prickles not representing branches. 

 In position of stipules. 



Buds hidden by leaf-scar Robinia. 19 



Buds exposed, red pubescent Zanthoxylum. 4 



Scattered. 



Plant provided with tendrils Smilax. 47 



No tendrils. 



A triple spine below leaf-scar Ribes. 28 



Twigs strongly glaucous or else 5-ndged. .Rubus. 24 

 Twigs cylindrical and at most only slightly 



glaucous Rosa. 25 



b. Plants unarmed. 



1. Buds naked. 



Dark brown, silky Asimina. 1 



Pubescence buff or gray. 



Bundle-scar one Ceanothus. 9 



Bundle-scars several Rhus. 17 



2. Buds scaly. 

 * Vines. 



Provided with tendrils. 



Woody partitions at nodes Vitis. 10 



No partitions at nodes. 



Aerial rootlets on old parts; tendrils irregu- 

 larly branching Ampelopsis. 12 



No aerial rootlets; tendrils forked Cissus. 11 



No tendrils. 



Leaf-scars semicircular Celastrus. 6 



Leaf-scars circular Menispermum. 2 



**Not vines. 



tLeaf -scars two-ranked. 

 Buds glabrous. 



Superposed Cercis. 20 



Single. 



Scales two or three Tilia. 3 



Scales several. 



Twigs brown Ulmus. 35 



Twigs light colored Morus. 38 



Buds pubescent. 



Pith diaphragmed Celtis. 36 



Pith homogeneous. 



Buds dark brown, silky Ulmus. 35 



Buds light brown, sparingly pubescent. 



Conical, pointed Ostrya. 43 



Flattened, rounded Corylus. 42 



ft Leaf-scars more than two-ranked. 

 Pith 5-angled. 



Upper buds clustered at apex of twig Quercus. 44 



