158 Trans. Acad. Sci. of St. Louis. 



spaces ; the walls are greatly thickened and color blue with 

 chlor-iodide of zinc; the contents color brown. 



Nutrient. In seed not quite mature this layer consists of 

 five to ten rows of thin-walled cells containing an abundance 

 of pigment and tannin. Chlor-iodide of zinc colors the walls 

 blue ; the vascular elements are lignified. 



Endosperm. The first layer of cells, aleurone, thick- walled, 

 followed by a variable amount of mucilaginous reserve cellu- 

 lose. Cells in lower part are thick-walled and elongated ; the 

 reserve cellulose readily dissolves in mineral acids. Contents 

 color brown with iodine, and the walls, blue with chlor-iodide 

 of zinc. 



Embryo. Exterior walls of the epidermal cells thicker than 

 the lateral ; these cells are nearly isodiametric ; the underlying, 

 somewhat larger ; palisade cells nearly wanting on the ends of 

 the seed but well developed in the middle lateral portion. Fat 

 and protein present; starch wanting. — (St. Louis, Eggert, 

 Mo. Bot. Gard.) 



Petalostemon violaceus, Michx. {K. purpurea. Vent., 



Macm.) 



PI. XII. f. 3. 



Testa and endosperm as in the last species. Malpighian 

 cells somewhat shorter than in P. candidus. Light line close 

 under the cuticle ; the central canal in cross section shows 

 numerous branches. Osteosclerids smaller towards the nar- 

 row part of the seed, and thick-walled. Nutrient layer com- 

 pressed, carrying a great deal of pigment. — (Indian Terri- 

 tory, Bush, Mo. Bot. Gard.) 



Tephrosia, Pers. {Cracca, L.) 



The species studied have endosperm, chromatophores in 

 Malpighian cells, and an abundance of fat and protein grains 

 in the cotyledons; starch is wanting. Lysigenetic canals 

 present in embryo, and usually an abundance of crystals of 

 oxalate of lime in the cotyledons. 



Tephrosia virginiana, Pers. {Cracca virginiana, L.) 

 PI. XII. f. 4-4c. PI. XIX. f. 1-lf. 

 Testa and endosperm 111 jx in thickness. Malpighian cells 



