^ ^^ 





GEEENE — PTELEA IN THE WEST AND SOUTHWEST. 



55 



obovate^ 2-8 em, long, acute, subentire; sa- 

 niiiras very small, suborbiciilar, 1 cm, long. 21. P. parvula. 

 Samaras not so small (except in ^''o. 22), but 

 body in all large in proportion, and broader 

 than the average breadth of the wing* 



Leaflets strongly glaucous on both faces, 

 small petiolulate, lanceolate, crenulate, 4 

 cm, long; samaras orbicular, 1.5 cm. 

 broad, emarginate. 

 Leaflets light j^caroely bhiish green above and 

 punctate, pale and villous beneath, odd one 

 cuncatc-obovate, 4 cm. long, obtuse; sama- 

 ras round-obovate, 1.5 cm. long, emarghiate. 23. P. moniicola 

 Leaflets dark blue-green, glaucous beneath. 



22. P, glmica. 



24. P. hetuUfolia. 



glabrous, odd one 7 cm. long, ovate-rhom- 

 boid, acute, doubly serrate-dentate; sama- 

 ras round-obovate, 2 cm, long. 



Leaflets as in 24 in all but the outUne, be- 

 ing narrow, lancelate, 7 cm. long; samaras 

 oval, often S-winged, remarkably muooth. 25. P. attrita. 



Leaflets of a deep scarcely bluish green 

 above, very pale beneath with bloom and 



a fine pu)>esence, odd one rhombic-lanceo- 

 late, 6 cm. long; samaras broadly ovate or 

 oval, acutish, at base truncate. 

 Upper face of f<4iage light-colored, never deep bluish 

 green, in a few species glauccscent, in most of a clear 

 bright green; samaras in all with broad wing. 

 Leaves in maturity hard and suhcoriaceous, 



Leaflets strongly gland-dotted, odd one 6 cm, 

 long, ovate-elliptic, acute at base, blunt at apex; 

 samaras round-obovate, 1,5 cm. long, retuse. 

 Leaflets less notably dotted, odd one 7 cnu long, 



narrow-obovate, acutish; samaras nearly orbic- 

 ular, 1.7 cm. long. 



Leaflets nearly dotless, light green and polished 

 above, 5 cm. long, obovate, obtuse; samaras 2 

 em, broad, not as long. 



Leaflets fine-dotted, deep green and polished, odd 

 one cuneate-obovate^ 5 cm. long, crenate, ob- 

 tuse or retuse. 



Leaflets lance-elliptic, 6 cm, long, subequal, long- 

 pointed, subentire; samaras orbicular. 2 cm. 

 broad, mnch dotted. 



Leaflets dull with a sliort soft pubescence, odd 



one 5 cm. long, elliptic-lanceolate, very acute; 



samaras suborbicular, L7 cm. long, not as broad, 



not much dotted. 



Leaves in maturity only firmly n:»embraiiaceous, at 



earlier stage very thin. 



Leaflets rich deep green above, pale-tomentulose 

 beneath, odd one 6 cm. long, broad-lanceolate, 

 acute; samaras round-oval, 2 cm, long. 



Leaflets bright light greim above, pale beneath, 

 odd one lance-rhomboid, 6 cm. long, acutish; 



26, P. sim'dts. 



27. P. polyadenia 



28. P. ahorujinum 



29. P. lacida. 



30, P. toxicodendron 



31. P. perslcifolia. 



32. P. sulfvesdta. 



33, P. padifol'ia. 



