GREENE — I'TKI.KA IN THE WEST AND SOUTHWEST. 





I es in maturity thinner, hardly firmer than membrana- 

 ceous, long and \ ery narrow . 



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

 Bubreniform-orbicular, nearly 2 cm. wide. 

 TWIGS never whitish, usually cinnamon-colored or darker at 

 the end of the firsl season; Leaves of a peculiar rather deep 

 but <lull green, much the same on both faces, never bluish- 

 green or glaucous, the venation in all singularly divaricate 

 and the veinleta colorless and obscure; samaras in mosl with 

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

 and nut-like. 

 Samaras conspicuously bul rather narrowly winged. — All 

 Californian. 



Leaflets oblong-lanceolate, lightly crenulate, 5 cm. 

 Long; smaller samaras orbicular, Longer round-obo- 

 vate, 2 ••m. Long, body very little broader than the 

 win-. 

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

 the odd one 7 cm. Ion-, 4 broad; samaras subreni- 

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

 notably wider than wing. 

 Leaflets thin, rather Lighl green, <><M one 5 cm. long, 

 obovate-oblong; samaras round-obovate, subulate- 

 pointed. 

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

 crenulate; samaras orbicular, 1.5 cm. across, body 

 twice as wide as w ing. 

 Leaflets elliptic-lanceolate, <> cm. long, subserrulate; 

 samara- orbicular or a trifle Longer, abruptly acute. 

 L.5 cm. Ion-; body much wider than win-. 

 Leaflets oblong-lanceolate, obtuse, 5.5 cm. Ion-, crenu- 

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

 body twice the width of the win-. 

 Samaras thick, nut-like, being win-less, or one species 

 with trace of win-. — All Lower Californian. 



Leaflets very small, narrowly obovate-oblong; samaras 

 oval, 2 cm. Ion-, encircled by a very narrow and 

 only keel-like wing. 

 Leaflets not so .-mail ; samaras i >val, 2 cm. Ion-, neither 



winged nor keeled. 

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

 Ion-, wingless. 



DESCRIPTIONS OF THE SPECIES. 



P. iliffna. 



51. P. brevixtylis. 



•">!'. /'. ovalifolia. 



■"'.;. /'. rinnamomea. 



5 l /'. <r nvlata. 



55. /'. bullata. 



"iii. /'. cycloloma. 



57. /'. nudfera. 



58. /'. obscura. 



59. /'. aptera. 



1. Ptelea aquilina, s]>. nov. 



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

 Leaves thin, of a rich deep green above, paler but not glaucescenl beneath, glabrous 

 on both face.-; odd Leaflet ovate-elliptic, 6 to 9 cm. long, obtusely short-pointed, 

 rather remotely Bubserrate-crenate, the pair one-third smaller, more oval, slightly 

 inequilateral: samara not large for the foliage, Little more or less than 2 cm. Ion-. 

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

 oval, of less than the width of the win-, indistinctly circum vallate, very definitely 

 transverse-rugose, notably glandular; style and stipe prominent, the latter loi e 



