-r-—pr 



1 ri 



56 



CONTTtJBUTIONS FROM THE NATIONAL HERBARIUM. 



34. P^neo-mexlcana 



samaras broad-orbicular, 2 cm. wide, not as long, 



retuse at both ends. 

 Leaflets subequal, i)aler beneath with fine haira; 



odd one lance-elliptic, 7 cm. long, very acute, 



entire; samaras only 1.5 cm. broad, the length 



less, retuse at apex. 

 Leaflets of a bright almost shining green, gnly 



lighter beneath, odd one f) cm. long, broadly 



elliptic, cuspidately acute; samaras 3 cm. long, a 



trifle wider, orbicular, subcordate,and obcordate. 36, 1\ megacarpa. 

 Leaflets light clear green above, paler and yellow- 



35. r, acutifol'ta 



ish beneath, odd one 5 cm. long, lanceolate, 

 hardly acute; samaras orbicular, 5 cm. across, 

 truncate at base, at apex emarginate. 

 TWIGS almost always glabrous, never chestnut-brown, in a 

 few cinnamon-reddish, in most straw-colored or wliitish and 

 shining. Foliage never dark, both faces usually yellow-green 

 (ahnost the hue of orange or lemon leaves). 

 Leaves in maturity subcoriaceous or almost coriaceous. 



Leaflets strongly dotted, sHghtly pubescent, odd one 



ovate, 5 cm. long, blunt at apex, and emarginate; 



samaras orbicular, 1.5 cm. across. 



Leaflets much less dotted, glabrous, odd one obovate, 



5 cm. long, ac'utish; samaras suborbicular, 1.7 cm. 



across. 

 Leaflets glabrous, coarsely <lotted above, pale beneath, 

 odd one rhombic-lanceolate, 4.5 cm. long, acute, 



37* F. laetissima. 



38, /*. verrucosa. 



39. P, a)nhige7iR, 



subcntire; samaras sub<^ordate-ovate, 1.5 cm. long. 40. P. vitem. 

 Leaflets glabrous, si/e and form as in the last, but pale 



41, P. pallvhi. 



42. P. ,stn(iitinea 



43. P. niiida. 



44. P. argpntea. 



with blooin and almost dotless; samaras orbicular, 



nearly 2 cm. across. 

 Leaflets hardly subcoriaceous, almost dotless, odd one 



obovate, 6 cm. long, obtuse, crenate ; samaras large, 



2 cm. broad, not as long, cordate and obcordate. 

 Leaflets small, yellow-grt^en on both faces and glal)rous, 



punctate, odd one ovate-lanceolate, 3.5 cm. long; 



sajviaras all triquetrous. 



Leaflets glabrous, much punctate, size and form as in 

 the last, but beneath silvery-lustrous ; samaras tri- 

 quetrous. 



Leaflt^ts dull yellow-green on both hicca and much 

 punctata?, odd one lanceolate, 4 cm. long, obtuse; 

 samaras large, broadly oval, 2 cm. long. 



Leaflets small, narrow-lanceolate, acute, hardly 4 cm, 

 long, wholly yellow-green ; samaras large for the 



leaves, triquetrous. 

 ^Leaflets larger, narrow-lanceolate, odd one (3 cm. long; 

 samaras large, flat, suborbicular, 2 cm. wide, rounded 



at both ends. 

 Leaflets truly lanceolate, much dotted, odd one 7 cm. 



long; samaras 2.2 cm. wide, cordate and obcordate. 48. J\ elegans. 

 Leaflets rhombic-lanceolate, only 3.5 cm. long ; samaras 



45. P. neyhcfd. 



46. P. triptera. 



47. P. lutescens, 



orbicular, 1.6 cm. across, retuse at base, at apex cus- 

 pidate-acute. 



49. P. cohfinis. 



