54 



CONTRIBUTIONS 1K<»M THE NATIONAL HERBARIUM. 



trder, firmer texture, approach- 

 wing as broad a> the body or 



I .i.i\ <•- in maturity of h 

 ing the coriaceous. 



Samara- large, the 



broader. 



Leaflets glabrous, glaucous on both faces, odd 

 one narrowly cuneate-obovate, 1.5 cm. Iohlt. 

 Bubentire; Bamaraa orbicular, 2 cm. long and 

 broad. 



Leaflets with traces of pubescence, dark blue- 

 green above, pale beneath, odd one •"> to 4 

 cm. long, round-obovate, very obtuse; sama- 

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



Leaflets very small, of like pale blue-green and 

 Bcantily hairy on both faces, odd one barely 

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

 ras larger than the foliage, Buborbicular, the 

 larger 2 cm. long. 



Leaflets not pale excepl beneath, hardly even 

 subcoriaceous, odd one ovate or rhombic- 

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

 samaras Bubquadrate - obovate, 2 cm. long, 

 lobed at base and snnimit. 



Leaflets colored as in the last, lance< 'late. 6 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, ti cm. long, acute; Bamaraa Buborbicu- 

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

 not flat but full and crisped. 



Leaves glabrous, blue-green above, whitish 



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



acute; samaras Bubquadrate-oval, the long* 



est 2 cm. long. Bubtruncale at both ends. 



Samaras smaller as a whole, the body and wing of 



equal breadth. 



Leaves bluish-green and much punctate above, 

 glaucescent beneath, odd one ovate or 

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

 ular, 1.5 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 1.4 cm. long, round- 

 obovate, acutish at baa 



Leaflet- 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. 



Leaflet- deep blue green above, glaucous be- 

 neath, nearly glabrous, odd one ovate or 



11. /'. coahuilervri*. 



12. /'. obtusata. 



13. P. pumUa. 



11. /'. scutellata. 



!">. /'. cuspidata. 



16. /'. undulala. 



17. J', cognata. 



18. P. crenata. 



l ( .». /'. jucunda. 



20. /'. smirlti. 



