54 



CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



^ 



Leaves in maturity of harder, firmer texture, approach- 

 ing the coriaceous. 

 Samaras large, the wing as l>n>a<l as the body or 



broader. 



Leaflets glabrous, glaucous on both faces, odd 

 one narrowly cuneate-obovate, 4.5 cm. long, 

 8ubentire; samaras orbicular, 2 cm. long and 



broad. 



Leaflets with traces of pubeycencej dark blue- 

 green above, pale beneath, odd one 3 to 4 

 cm. long, round-obovatej very obtuse; s^ama- 

 ras round-oval, 1 to 3 cm. long. 



Leaflets very small, of like pale blue-green and 

 scantily hairy on both faces, odd one barely 

 L5 cm. long, oblong-obovate, obtuse; sama- 

 ras larger than the foliage, suborbicular, the 

 larger 2 cm. long. 



Leaflet? not pale except ]>eneath, hardly even 

 subcoriaceous, odd one ovate or rhombic- 

 ovate, 4 to 5 cm. long, acute, crenulate; 

 samaras yubquadrate - obovate, 2 cm. long, 

 lobed at base and summit. 



Leaflets colored as in the last, lanceolate, G cm. 

 long; samaras broadly ovate-cordate, 2 cm. 

 long, cuspidate at apex. 



Leaflets of dark only faintly bluish green 

 above, pale beneath, odd one broadly lance- 

 olate, C cm. long, acute; samaras suborbicu- 

 lar, 2 cm. long and wide, the broad wing 

 not flat but full and crisped. 



Leaves glabrous, blue-green above, wlntish 

 beneath, odd one 5 cm. long, ovate-elliptic, 

 acute; samaras subqnadrate-oval, the long- 

 est 2 cm. long, subtruncate at botli ends. 

 Samaras smaller as a whole, the body and wing of 

 equal breadth. 



Leaves bluish-green and mucli punctate above, 

 glaucescent beneath, odd one ovate or 

 obovate, 6 cm. long, crenate; samaras orbic- 



F 



ular, Lr5 cm. long and wide. 



Leaves dull blue-green above, glaucous and 

 puberulent beneath, odd one lance-obovate 

 to lance-rhombic, 4 to 5 cm. long, acute, 

 crenate; samaras 1.2 to L4 cm. long, round- 

 obovate, acutish at l)ape. 



Leaflets glaucescent and along the veins 

 slightly villous as to both laces, odd one 

 broadly obovate and acute, 4 cm. long; small, 



obovate, 1 to 1.5 cm. long. 

 Leaflets deep blue green above, glaucous be- 

 neath, nearly glabrous, odd one ovate or 



11. P, coahuihn'<is. 



12. P. ohimata. 



13. P. pumila. 



14. P. seulcUata, 



15. P. cuspidata 



16. P. undulata 



17. P, cognaia. 



18. P, crenata. 



19. P. jncunda 



20. P. sanda. 



