5 KEY, UASED UPON LEAVES. 3 



e* Oblong, acute to acuminate both ends, entire and irregularly serrulate, 3-7 in., 



glaucous bn.; fr. capsule SOBBEL-TBEE (Oxydendrum arboreum). 



e Obovate-oblong, cuneate to rounded b., 1-3 in., whitish pubescent bn.; fr. 



capsule - BEER'S WILLOW (Salix Bebbiana) . 



e? Elliptical, very thick and firm, glabrous, with few remote spine-tipped teeth, 



evergreen; fr. drupe HOLLY (Ilex opaca). 



e* Obovate, %-2 in., subsessile, firm thick and lustrous, entire and obscurely 



denticulate; fr. berry SPABKLEBEBBY (Vaccinium arborem). 



d 3 Margin both entire and lobed, the latter mostly on vigorous shoots, very short- 

 stemmed; the entire leaves are 



e Lance-obovate to spatulate, cuneate b., wide and rounded or obscurely 3 

 lobed a. (other leaves sharply pinnately 3-7-lobed) tardily deciduous; 



fr. acorn : WATEB OAK ( Quercus nigra) . 



e 2 Ovate-oblong, 2-7 in., abruptly narrowed b., acute or obtuse a. (other leaves 

 with large lobe on one or both sides) ; fr. drupe. 



SASSAFBAS (Sassafras sassafras). 



e 3 Broad-ovate, large, long-stemmed, the lowest pair of veins branching; arrange- 

 ment 

 f Ternate (some opposite) subcordate, acute or acuminate, pith of twigs 



not segmented; fr. pod-like; leaves 

 g Acute or short acuminate; fringe of hairs on seeds pointed. 



CATALPA (Catalpa catalpa). 

 g2 Long-acuminate, fringe of hairs of seeds wide. 



HABDY CATALPA (Catalpa speciosa). 

 f2 Opposite, cordate., acute or bluntly pointed, pith of twigs segmented; 



fr. capsule PBINCESS TBEE (Paulownia tomentosa). 



d* Margin serrate or serrulate, 

 e Leaves inequilateral, alternate; 



f Petioles short, veins impressed above and 

 g Parallel; mostly doubly serrate, firm 

 h Smooth above; fr. samara; branch lets 



i Not corky- wi nged ; leaf-buds smooth and blunt. 



WHITE ELM (Ulmus Americana). 

 i2 Some corky-winged; leaf-buds acuminate, puberulous; 



j Leaves 2-6 in.; a northern tree CORK ELM (Ulmus Thomasi). 



j2 %-3 in.; a southern tree WINGED ELM (Ulmus alata). 



h 2 Very rough above.; fr. samara SLIPPEBY ELM (Ulmus pubscens). 



g2 Not parallel, arcuate and ramose; simply serrate, thin; fr. drupe. 



HACKBEBBY (Celtis Occident alls) . 



f2 Petioles long; veins little if at all impressed, arcuate, ovate-orbicular, 

 prominently reticulated; fr. nut-like with parachute. 



g Leaves smooth and greenish beneath BASSWOOD (Tilia Americana). 



g2 Leaves silvery-pubescent beneath, with small if any axillary tufts. 



WHITE BASSWOOD (T. heterophyll*) . 

 gs Leaves stellate-pubescent beneath, with conspicuous axillary tufts. 



MICHADX'S BASSWOOD (T. Michauxii). 

 g* Leaves rusty-pubescent beneath; a southern tree. 



DOWNY BASSWOOD (T. pubescens). 

 e 2 Leaves equilateral or nearly so; fr. a 



