172 Trans. Acad. Sci. of St. Louis. 



light line, where it widens again. Sections which had passed 

 through potassium hydrate before mounting in glycerine, after 

 the lapse of several years colored uniformly dark brown. 



Osteosclerid. Cells I-shaped, with elongated intercellular 

 spaces, and thickened walls. Cells contain tannin and pig- 

 ment. Sections treated with potassium hydrate change from 

 a yellowish to a dark brown color. 



Nutrient. Layer compressed, consisting of from four to 

 six rows of cells which are elongated and thick-walled. Con- 

 tain but a small amount of pigment and some protein grains. 



Endosperm. Cells of the aleurone layer continuous, nearly 

 isodiametric, thick-walled, containing protein grains and fat ; 

 the walls of the reserve cellulose differentiated into three 

 parts, primary, secondary, and tertiary; internal layer of 

 endosperm is made up of thick- walled, elongated cells. The 

 cells of the reserve cellulose layer contain protein and fat. 



Embryo. Cells of the first row nearly isodiametric ; the 

 exterior walls of the epidermis are thickened ; cells below 

 more loosely arranged with intercellular spaces. Inner face 

 of the cotyledons with isodiametric epidermal cells, and several 

 rows of palisade cells, the outer row much larger. Procambial 

 bundles more than ten. All of the walls of the cotyledons 

 color blue with chlor-iodide of zinc. Cells contain protein 

 and fat but no starch. — (Sapulpa, Indian Terr., Bush, Mo. 

 Bot. Gard. — East St. Louis, Ills., Pammel.) 



Desmodiutvi strictum, DC. {M. strida^ Pursh, Kuntze.) 



PI. XV. f. 2. 



Testa and endosperm 90-100 p, thick. Malpighain ceUs 50 fi 

 long; light line below the cuticularized layer, but further re- 

 moved than in the last species ; the yellow pigment is abundant 

 in freshly mounted specimens. Nutrient layer compressed; 

 the cells are elongated and contain an abundance of pigment. 

 Aleurone layer as in D. canescens. Walls of the reserve 

 cellulose cells greatly thickened, in some cases very irregular; 

 the cell-cavity small. Internal layer of endosperm consists of 

 elongated, thick-walled cells. Embryo as in last species. 



Desmodium nudiflorum, DC. {M. nudiflora, L., Kuntze.) 

 PI. XXIII. f. 2. 

 Testa and endosperm 90-100 /* thick. Malpighian cells 42 ^ 



