+ r 



■ ■Tj 





/r^ - ■■ 



■^ 



:f ■ 



GEEENE PTELEA IN THE WEST AND SOUTHWEST. 



57 



\ 



Leaves in maturity tliinnerj hardly firmer tliuii membrana- 

 ceous, long and very narrow. 



Leaflets narrow-lanceolate, odd one 8 cm. long ; wamaras 

 subreniform-orbicular, nearly 2 cm. wide, 

 TWIGS never wliiti;=h, usually cinnamon-colured or darker at 

 the end of the first aeason; leaves of a peculiar rather deep 

 l)ut dull green J much the same on both face?, never bluish- 

 green or glaucous, the venation in all f=ingularly divaricate 

 and the veinlets colorless and obscuru; saniara^ in most with 

 a narrow wing and broader body, in a few wingless, thick 

 and nutdike* 



Samakas conspicuously but rather narrowly winged. — All 

 Californian. 



Leaflets oblongdanceolate, lightly crcntdate, 5 cm. 

 long; gmaller samaras orbicular, longer round-obo- 

 vate, 2 cm. long, body very little broader than the 

 wing. 



Leaflets of rather vivid green, oval, ample, subequal, 

 the odd one 7 cm. long, 4 broad; namaras subreni- 

 form-orbicular, 1.7 cm. broad, 1.4 cm. long, body 

 notablv ^vider tiian wine:. 



Leaflets thin, rather light grci^u, odd one 5 cm. long, 



obovate-oblong; samaras round-obo\ ate, subulate- 

 pointed* 



Leaflets cuneate-obovate, odd one 4 to 7 cm, long, 

 crenulate; samaras orbicular, L5 cm. across, body 

 twice as wdde as wing. 



Leaflets ellipticdanceolate, 6 cm, long, subserrulate; 

 samaras orbicular or a trifle longer, abruptly acute, 

 1.5 cm. long; body much wider than wing. 



Leaflets oblongdanceolate, obtuse, 5.5 cm. long, crenu- 

 late; samaras (orbicular, perfectly so, 1.5 cm. wide, 

 body twice the wi<lth of the wing. 

 SAMAiiAs thick, nutdike, being wingless, or one species 

 with trace of wing. — All Lower Californian. 



Leaflets very small, narr(.>wly obovate-oblong; samaras 

 oval, 2 cm. long, encircled by a very narrow and 

 only keel-like wing. 



Leaflets not so small; samaras oval, 2 cm. long, neither 

 winged n(M- keeled. 



Leaflets very small; samaras round-ovate, only 1 cm. 

 long, wingless. 



DESCRIPTIONS OF THE SPECIES. 



50< P. ikdigna. 



51. P. hrevutylis. 



52. P. ovalifolla. 



53. P. cinnamomea 



54. P. crcnulata. 



55* P. bullata. 



56. P. cycloloma 



57. P. nucifera 



58, P, ohscura. 



51). P. aptera. 



1. Ptelea aquilina, sp. nov. 



Twigs of the season dark red-brown, glabrous, lightly rugulose and glandular: 

 leaves thin, of a rich deep green al>ove, paler but not glaucescent beneath, glabrous 

 on both faces; odd leaflet ovate-ellii)tic, 6 to 9 cm. long, obtusely short-poijited, 

 rather remotely subserrate-crenate, the ])air one-thiid smaller, mure oval, slightly 

 inequilateral: samara not large for the foliage, little more or less than 2 cm. long, 

 broadly round-obovate, abruptly acutish, the base now and then retuse; body broadly 

 oval, of less than the witlth of the wing, in<listinctly circumvallato, very definitely 

 transverse-rugose, notably glandular; style and stipe prominent, the latter longer. 



