Pilea UKTICACE^ 61 



Leaves elliptical-oblong to narrowly obovate, 

 6-13 cm. 1. (Leaves sometimes toothed 

 near apex.) 21. P. reticulata. 



Leaves not entire. 



Leaves of a pair unequal or differing in form. 

 Smaller leaf of a pair minute. 



Larger leaves pinnatifid-lobed 10. P,lucida. 



Larger leaves crenate-dentate 11. P. crenulata. 



Smaller leaf one-half or one-third as long as 

 the larger (sometimes even smaller on the 

 same plant). 

 Branches hirsute. 



Leaves glabrous 12. P. Wilsonii. 



Leaves hirsute. 



Cymes paniculate 13. P. rufa. 



Cymes umbellate or corymbose 14. P. rufescens. 



Branches glabrous. 



Larger leaves broader above the middle... 15. P. saxicola. 

 Larger leaves broader at the middle. 



Leaves serrate in upper two-thirds 16. P. WullschlaegeUi. 



Leaves serrate in upper third 17. P. clandestina. 



Branches glabrous but ciliate at young nodes 18. P. ciliata. 



Leaves of a pair of the same size or form, or, 

 exceptionally unequal. 

 *Stem and leaves glabrous. 



■fPeduncles (at any rate those of the fruiting ; 

 cymes) generally longer than the petioles. 



Leaves 1-nerved, penniveined 19. P. serrulata. 



Leaves 3-nerved or triplinerved. 



Leaves oblanceolate 20. P. oblanceolata. 



Leaves ovate or elliptical. 



Leaves lanceolate to narrowly-ellipti- 

 cal 22. P. crassifolia. 



Leaves ovate. 



Leaves large, reaching 10 cm. or 

 more in length. 

 Leaf - base rounded, sometimes 

 slightly cordate pr unequal; 

 dorsal appendages of male 

 flower linear. 

 Leaves elliptical or ovate-ellipti- 

 cal, appendages of male 

 flower erect or connivent... 23. P. grandifolia. 

 Leaves ovate (smaller than in 

 P. grandifolia), appendages 



patent 24. P. Elizdbethm. 



Leaf-base cordate, appendages of 



male flower broad and flat.... 25. P. appendicilata. 

 Leaves of medium size, not exceed- 

 ing 5 cm. 1. 

 Stipules elliptical, 5-6 mm. 1. 

 (Leaves sometimes with a few 



hairs.) 41. P.caudata. 



Stipules semilunar, '5-1 mm. 1. 



(Stem minutely puberulous.)... 26. P. brevistipula. 

 Leaves small, 1'5 cm. 1. and less.... 27. P. dauciodora var. 



parvifolia. 



