214 Trans. Acad. Sci. of St. Louis. 



above the middle. Cells contain tannin, protein, and chro- 

 matophores. 



Osteosclerid. Cells somewhat I-shaped, longer than broad, 

 with a small intercellular space. The cells are smaller than 

 those of the nutrient layer. 



Nutrient. Cells thick-walled. Sclerotic walls usually 

 colorless. Cells contain tannin. 



Inner integument. It is much compressed, but on the 

 addition of chloral hydrate the thin-walled parenchyma cells 

 expand. 



JSTucellus. This consists of two to four rows of compressed 

 cells with granular contents. 



Endosperm. This layer is variable in thickness and well 

 developed. Aleurone cells are thick-walled, usually isodia- 

 metric; the cells below are thick- walled, consisting of reserve 

 cellulose. 



Embryo. Epidermal cells much smaller than the underly- 

 ing parenchyma, those of the inferior face elongated and 

 more loosely arranged than those of the superior face. Two 

 rows of palisade cells on the superior face of the cotyledons. 

 Starch absent ; aleurone grains and fat abundant. 



MIMOSEAE — Eumimoseae. 



Desmanthus, Willd. {Acuan, Med.) 



The structure is much the same as in Gymnodadus. Car- 

 tilaginous endosperm is abundant; inner testa also present. 

 Starch is absent. 



Desmanthus BRACHYLOBus, Benth. {Acuan lllinoensis.Mx.) 



Fl. XVIII. f. l-Ib. 



Testa, with endosperm, 445 /u. thick, endosperm 282 /u, thick. 

 Cotyledons 664 fx across. 



Malpighian. The cells are 50-52 n long. Cuticle and cuti- 

 cularized layer are brownish, bearing colorless projections; the 

 cuticularized layer easily separates from the remainder of the 

 cell ; the rather wide light line occurs a little below the mid- 

 dle. Cell-cavity wide at the base, gradually tapering upward. 

 Several pores extend into the wall below the light line, from 

 the cuticularized layer. 



