STANDLEY TREES AND SHRUBS OF MEXICO. 545 



Leaflets rounded to acute at apex. 

 Leaflets 3 27. E. biflorum. 



Leaflets 5 or more. 

 Leaflets crenate with large coarse teeth. 



Base of the leaflets acute or cuneate 28. E. laxiflorum. 



Base of the leaflets rounded or obtuse 37. E. aloexylon. 



Leaflets with very small appressed teeth. 



Leaflets entire or with few distant obscure teeth. 



21. E. odoratum. 

 Leaflets finely crenate along almost the whole margin. 



29. E. fagaroides. 

 Leaflets conspicuously pubescent beneath even at maturity, on the sur- 

 face as well as on the costa. 

 Teeth of the leaflets small and appressed or none. 



Leaflets green beneath, sparsely puberulent 21. E. odoratum. 



Leaflets white-tomentose beneath. 



Leaflets glabrate on the upper surface, narrowly lanceolate. 



30. E. bicolor. 



Leaflets pilose on the upper surface, oblong 31. E. pannosum. 



Teeth large and coarse. 



Leaves at maturity thick-coriaceous, strongly buUate on the upper 

 surface, densely pubescent on both surfaces. 



Lenflets 11 to 21 in all or most of the leaves 32. E. jorullense. 



Leaflets 5 to 9. 



Leaflets 1 to 1.5 cm. long 33. E. schiedeanum. 



Leaflets mostly 3 to 6 cm. long 34. E. cuneatum. 



Leaves thin at maturity, or if thick never buUate. 



Fruit densely pubescent 35. E. submoniliforme. 



Fruit glabrous. 

 Leaflets at maturity glabrous on the upper surface, often lus- 

 trous, rarely pubescent, but then 12 mm. long or shorter. 

 Leaflets 9 to 19, with a few irregular crenations. 



36. E. filicifolium. 

 Leaflets 5 to 9, regularly crenate. 

 Inflorescence pubescent, short-pedunculate_37. E. aloexylon. 

 Inflorescence glabrous, long-pedunculate. 



38. E. longipedunculatum. 

 Leaflets densely pubescent on the upper surface at maturity, 

 usually 2 cm. long or larger. 



Leaflets 15 to 21 39. E. sessiliflorum. 



Leaflets 1 to 11. 



Leaflets long-acuminate 24. E. pubescens. 



Leaflets obtuse. 



Rachis conspicuously dentate 40. E. excelsum. 



Rachis entire. 



Flowers nearly sessile 41. E. queretarense. 



Flowers slender-pedicellate 42. E. rhoifolium. 



1. Elaphrium subtrifoliatum Rose, N. Araer. Fl. 25: 244. 1911. 



TereUnthus subtrifoliatus Rose, Contr. U. S. Nat. Herb. 10: 122. 1906. 



Jalisco ; type collected west of Bolanos. 



Low glabrous shrub with dark reddish brown branchlets ; leaflets 1 or 3, 

 ovate-rhombic, 1 to 2.5 cm. long, rounded at apex. 

 7808—23 3 



