GREENE PTELEA IN THE WEST AND SOUTHWEST 



53 



SYNOPSIS OF THE SPECIES. 



TWIGS when not velvety-hoary either chestnut-colored or 

 darker, never whitish or Btraw-colored. 



Qppeb face of foliage more or Less definitely bluish-green 

 or glaucescent, never clear bright green. 



Leaves in maturity thin, or thinnish, never hard and 

 Bubcoriaceous; samaras in all these very Large, thin 

 and plane, the wing ample, the body small in pro- 

 portion. 

 Leaflets dark, scarcely bluish-green, nol glaucous, 

 only Lighter beneath, glabrous, odd one obovate 

 to long-ovate, 9 cm. 1 « » n l: : samaras suborbicular, 

 2 cm. long, nearly as wide. 

 Leaflets definitely blue-green on both faces, nearly 

 glabrous, odd one ovate, 5 <-m. long; samaras 

 Buborbicular, retuse at base, obcordate at sum- 

 mit. 

 Leaflets dull with pubescence above, even more so 

 beneath, odd one broadly obovate, 4 cm. long; 

 samaras suborbicular, L.5 cm. Long, sharply 

 wrinkled and with longitudinal -harp ridge. 

 Leaflets < lull and pubescent, odd one elliptic- 



loni 



round-oval, 



obovate, 6.5 cm. long; samaras 

 cm. Long, sharply wrinkled, but with no median 

 ridge. 

 Leaflets pale, gray-green with pubescence, odd one 

 obovate-elliptic, 5 cm. long, of firmer texture; 

 large samaras broadly somewhal obovate, ob- 

 tuse, •"> •■in. long, obtusely wrinkled and much 



(lotted. 



Leaflets less pubescent, bluish-green only when 

 young,very firm when mature, odd one broadly 

 obovate, 7 cm. long, cuspidate-pointed; samaras 

 suborbicular, ■'! cm. long, subcordate. 



Leaflets very pale, beneath whitish with bloom, 

 large, odd one oval to obovate, 7 cm. long, acut- 

 ish; samaras small for the foliage, 2 cm. long, 

 obtuse at base, at apex emarginate. 



Leaflets very pale, whitish beneath with bloom, 

 almost so above, small, firm, odd one broadly 

 rhombic-lanceolate, 4.5 cm. long; samara- large 

 for the foliage, rounded, but truncate at Loth 



ends. 



Leaflet- pale, whitish beneath with bloom and 

 white down, odd one ovate. 5 cm. long, obtuse, 

 crenate; samaras orbicular, 1.5 cm. long and 



wide. 



Leaflets glaucous on both face-, tomentulose be- 

 neath, odd one ovate-elliptic, 5 cm. long, suben- 

 tire; samaras broader than long, with cordate 

 lobes at each end. the breadth 2 cm. 



1. /'. aauUina. 



■_'. /'. isophyUa. 



■ ',. I', prominula. 



4. /'. wrightiana. 



5. P. antonina. 



6. P. rhombifolia. 



7. P. formosd. 



g. /'. Ulosula. 



9. P. tortuos 



10. P. .<' 



