134 Trans. Acad. Sci. of St. Louis. 



eral use I have placed the names used by them in parenthesis 

 where their system differs from Gray and the Kew Index. 



The material for this study was obtained from the her- 

 barium of the Missouri Botanical Garden, the herbarium of 

 the Iowa State College of Agriculture and Mechanic Arts, and 

 the seed collection of the United States Department of 

 Agriculture. I have given a general synopsis of the tribes 

 and genera at the end of the descriptive part of the work. 



PAPILIONACEAE — Podalyrieae. 



Baptisia, Vent. 

 Baptisia leucantha, Torr. & Gray. 



PI . VII. f. 1. PI. XXXV. f.l2. 



Testa well developed, somewhat irregular on surface, total 

 thickness on sides 398.4 fi. 



Malpighian.* Cuticle forms a continuous narrow layer, 

 darker in color than the remainder of the cell. The outer 

 portion of the cell-wall separates from the remainder of the 

 wall where the conical projections occur. Light line nar- 

 row, occurs underneath the cuticle, and colors blue with 

 chlor-iodide of zinc. 



Malpighian cells 117.6 ji. long, somewhat longer toward the 

 hilar region, with a shorter second row. In a surface view the 

 cells are usually six-sided with a central " canal" and 5 to 6 

 lateral branches; rarely more than two terminal branches. 

 Cell-cavity gradually tapers toward the upper end. The pores 

 extend a little less than one-third of the way down. Pigment 

 and some tannin present ; slight lignification below cuticle, 

 and in lower portion of the cell-wall where it joins the osteo- 

 sclerid. 



Osteosclerid. Cells vary in length, mostly 30-80 //, wider 

 in lower part than above, with large intercellular spaces in 

 the hilar region where the cells are much larger and trans- 

 formed into «tar-shaped parenchyma. Cell-walls are colored 



* I have employed Malpighian for Malpighian layer, Osteosclerid for 

 osteosclerid layer, Nutrient for nutrient layer, and Mycotic for mycotic 

 layer. 



