156 Trans. Acad. Sci. of St. Louis. 



endosperm. Malpighian cells 66.4 ju long; pore-canals well 

 marked. Cblor-iodide of zinc colors the cell-walls blue very 

 rapidly. Osteosclerids variable as to length, thick-walled, 

 with large intercellular spaces. Cells contain pigment, tan- 

 nin, and protein. Nutrient layer as in the last species. 

 Cells of the aleurone layer of the endosperm are thick-walled. 

 Cells of the reserve cellulose with small pore-canals. Walls 

 differentiated into three distinct layers. The secondary wall 

 colors blue rapidly, the inner is more refractive and colors 

 violet blue. The cells contain fat and protein. The internal 

 layer of the endosperm as in A. canescens. The cells of the 

 embryo agree with those of the last species as to structure, 

 but starch was not found. — (N. C, Mo. Bot. Gard.) 



Dalea, L. [ParoseJa, Cay.) 



Early studies of some species of this genus were made by 

 Schleiden and Vogel. All of the species, thus far studied, 

 contain endosperm. The embryo contains no starch. Pig- 

 ment abundant in the nutrient layer. 



Dalea alopecuroides, Willd. {Parosela Dalea, L., Britt.) 



PL XII. f. l-lb. 5. 



Testa and endosperm from 150-265 fj, in thickness. Varia- 

 tion is mostly due to the endosperm, which reaches its greatest 

 development laterally. 



Malpighian. Cells are 36.4 /a in length. Cuticle promi- 

 nent; cuticularized layer not conspicuous; narrow light line 

 near the cuticle ; pores prominent, extending into the walls 

 beyond the light line. Cell cavity broad at the base, 

 containing protein grains. 



Osteosclerid. Cells thick-waUed, lighter in color than the 

 Malpio^hian layer. They contain pigment, tannin, and 

 protein . 



Nutrient. This layer is compressed and the ceUs are elon- 

 o-ated. Walls color blue with cblor-iodide of zinc. Brown 

 pigment abundant in the vascular region. 



Endosperm. Aleurone cells nearly isodiametric, containing 

 fat and protein ; most of the endosperm consisting of reserve 

 cellulose, with prominent pore-canals; the internal layer con- 



