abcd 3 e 3 f 10 



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



CATALPA (Catalpa catalpa). 

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



HARDY CATALPA ( Catalpa speciosa } . 

 f 2 Opposite, cordate., acute or bluntly pointed, pith of twigs segmented; 



fr. capsule PRINCESS TREE (Paulownia tomentosa) . 



d 4 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; branchlets 



i Not corky-winged; 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) . 



h2 Very rough above. ; f r. samara SLIPPERY ELM ( Ulmus pubscens ) . 



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



HACKBERRY (Celtis occidentalis) . 

 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). 



