STAXDLEY TTvEES AND SHRUBS OF MEXICO. 693 



Branches densely tonientose or pilosuloiis with yellowish or sordid 

 hairs. 

 Branches very densely tonientose ; leaves pinnate. 



9. S. schiedeana. 

 Branches finely tomentulose or pilose ; leaves biternate. 

 Leaflets soft-pilose beneath. 



Mature fruit about 2 cm. long 10. S. triquetra. 



Mature fruit about 1 cm. long 11. S. oaxacana. 



Leaflets subglabrous 12. S. goniocarpa. 



Partition walls of the fruit narrow, less than half as broad as the fertile 

 portion, the cells lightly coherent. 

 Cells of the fruit strongly compressed. Leaves 3-foliolate. 



13. S. cardiospermoides. 

 Cells not or scarcely compressed. 



Woody portion of the stem compound, with small separate outer fascicles ; 

 cells of the fruit sulcate or scrobiculate between the nerves. 

 Leaves 3-foliolate. 



Leaflets densely pubescent beneath; fruit pubescent 14. S. plicata. 



Leaflets glabrous . 15. S. rekoi.. 



Leaves biternate. 



Outer sepals glabrous ; leaflets subcoriaceous, mostly lance-oblong. 



16. S. caracasana. 

 Outer sepals puberuient or tomentulose ; leaflets broader. 



Petals 3 mm. long 17. S. brachylopha. 



Petals 3.5 to 5 mm. long. 

 Outer woody fascicles subterete ; branches deeply sulcate ; terminal 



leaflet obovate or subrhombic 18. S. paniculata. 



Outer fascicles all or partly applanate ; branches lightly striate; 



terminal leaflet oblong ig'. S. scatens. 



Woody portion of the stem simple, without outer fascicles; cells of the 

 fruit not sulcate or scrobiculate. 

 Cells of the fruit lenticular; sepals densely white-tomentose. Leaves 

 biternate. 

 Branches deeply 5-sulcate, usually aculeolate ; scales of the upper petals 



with short emarginate crests 20. S. mexicana. 



Branches 5-angulate, unarmed ; scales of the upper petals large, bicor- 



niculate-bifid 21. S. brachycarpa. 



Cells inflated, more or less produced beyond the axis; sepals glabrous 

 or variously pubescent. 

 Branches 8 to 10-striate or 8 to 10-costate. 

 Terminal leaflet about 5 cm. long, ovate, elliptic, or subrhombic, 



sharply serrate 22. S. vesicosa. 



Terminal leaflet rarely more than 2 em. long, oblong, ovate-oblong 

 or spatulate-obovate, coarsely crenate or entire. 

 Leaflets mostly oblong-lanceolate or oblong-ovate, densely puberu- 



lent beneath 23. S. palmeri. 



Leaflets mostly spatulate-obovate, glabrate 24. S. rutaefolia. 



Branches 5 or 6-sulcate. 

 Leaves all or chiefly trifoliolate. 



Terminal leaflet 1.5 to 2 cm. long 25. S. albida. 



Terminal leaflet 4 to 8 cm. long. 



Leaflets serrate or dentate 26. S. grosU. 



Leaflets entire, or with a small lobe on each side at the base. 



27. S. emarginata. 



