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WILSON: SPECIES CHARACTERS IN PTELEA AND TARAVALIA 297 
_are identical with type material of one or the other of the above, 
while others are apparently mere leaf variations of these, or of 
P. tomentosa Raf. (of which P. trifoliata mollis T. & G. appears to 
be a form), or of P. trifoliata L. 
Taravalia Greene, endemic in Lower California, has tardily de- 
hiscent, tough, nutlike, woody capsules, which are more or less 
distinctly margined, and very unlike the winged samaras of Ptelea. 
Although three species of Taravalia have been described, I have 
failed to find characters to admit more than one. 
New YorK BOTANICAL GARDEN. 
