178 Trans. Acad, Sci. of St. Louis. 



thickened, much smaller than those below ; the cells of the 

 internal part of the cotyledon like those of the outer part and 

 followed by cells which are elongated at right angles, gradu- 

 ally becoming larger, with small intercellular spaces. The 

 walls of all the cells below the epidermal layer are provided 

 with pores. The epidermal cells of the caulicle are much 

 larger, but smaller than those below. All of the walls color 

 blue with chlor-iodide of zinc. Starch colors blue with iodine. 

 The cells have comparatively few round or elliptical starch 

 grains, with an elongated rift, which are soluble in weak hydro- 

 chloric acid. Alcannin colors the oil plasma red in the course 

 of a few seconds. The aleurone, which is imbedded in the oil 

 plasma, is very abundant. When mounted in glycerine beau- 

 tiful aleurone grains with crystalloid and globoid come out. 

 As a rule there is but a single crystalloid in the grain, each 

 showing one globoid ; the latter does not, however, always 

 show. 



Chapmannia, Torr. & Gray. 



The testa is prominently veined, delicate, whitish and, with 

 endosperm, 33 fju thick, except in hilar region, where it measures 

 140 /JL. The endosperm is but sparingly developed, consist- 

 ing of a single row of cells, the aleurone layer. 



Chapmannia is undoubtedly closely related to Arachis and 

 jStylosanthes. It is the only genus studied, from which the Mal- 

 pighian cells are absent. The epidermal cells are thin-walled ; 

 the light line is absent. The osteosclerid layer is present and 

 consists of elongated cells with intercellular spaces, or it is but 

 little diiferentiated. 



Chapmannia florid ana, Torr. & Gray. 



PL XVII. f. 5. 



The epidermal cells are usually isodiametric, the exterior 

 walls but slightly thickened; the lateral walls are thin. No 

 pore-canals from the surface as in Arachis; the large cell- 

 cavity contains a nucleus. 



Osteosclerid. The cells are thin- walled, larger than the 

 epidermal cells, and occur only in the hilar region ; intercellular 

 spaces vary in size. 



