146 Trans. Acad. Sci. of St. Louis. 



protein grains and pigment, and a conspicuous large chroma- 

 topborc in their lower part. 



Osteosderid. Cells with a broad base and hence a trian- 

 gular space under the Malpighian cells ; cell- walls thickened, 

 and marked with longitudinal striae, the canals. The cells 

 contain some protein grains. 



Nutrient. Layer but slightly developed. Parenchyma 

 cells contain pigment, the cell-walls also pigmented. 



Endosperm. Aleuroue layer of elongated, thick-walled 

 cells, containing fat and protein, followed by one or more 

 layers of larger cells with similar walls, and, in the lower 

 part, by thick-walled, elongated cells with a narrow cavity. 

 These cells contain some protein grains. 



Embryo. First row of cells smaller; the outer walls next 

 to the endosperm thickened. These cells have an abundance 

 of protein and fat but no starch. The remaining cells are as 

 in T. pratense, but with less starch. — (Shannon Co., Mo., B. 

 F. Bush, Mo.Bot. Gard.) 



Trifolium agrarium, L. 



PL IX. f. 2b. 



Testa and endosperm 60-90 pi in thickness. In the narrow 

 portions the Malpighian cells are nearly as long as the re- 

 mainder of the testa is thick. The endosperm much the same 

 as in T. reflexum except that the round chromatophores are 

 near the center and the intercellular space between the osteo- 

 sclerids is smaller. The cell-walls of the aleurone layer are 

 thicker. The mucilaginous reserve cellulose of the endosperm 

 is thick-walled. The cells of the embryo as in other species; 

 numerous small starch grains and aleurone grains. The walls 

 of the outer row of cells greatly thickened. — (Nantucket, 

 Mass., Fritchey). 



Melilotus, Tourn. 



The species of this genus are much alike and in their ana- 

 tomical structure resemble Medicago. The osteosclerids have 

 conspicuous longitudinal canals. The aleurone layer is well- 

 marked, and there are variable amounts of additional endo- 

 sperm. The testa and cotyledons contain cumarin which also 



