Pammel — Anatomical Characters of Seeds of Leguminosae, 177 



in both genera. Marloth has discussed these features for the 

 peanut. The Malpighian cells are short, and the light line is 

 indistinct or wanting. The osteosclerid layer is suppressed. 

 The related Zornia hracteata, J. F. Gmel. has well-developed 

 Malpighian cells and an osteosclerid layer. The testa in both 

 genera is prominently veined. The seeds are very oily, but 

 those of Arachis more so than those of Slylosanthes, 

 Endosperm much reduced. Many chemical analyses have been 

 made. These may be found in Konig, Harz, and Jenkins and 

 Winton. 



Arachis hypogaea, L. 



Pl.XXII.f.3-3g. 



Testa 112 fju thick. The endosperm occurs as a single row, 

 the aleurone. The outer part of the testa brown, the inner 

 yellow. It is differentiated into three parts; the nutrient 

 layer is, however, divided. 



Malpighian. Cells short, nearly as broad as long, measur- 

 ing 16X20 /JL, Cuticle delicate. Numerous thickened pro- 

 cesses from the cuticularized layer, with small pore-canals ; 

 surface view similar to that of 8tylosanihes ; light line is 

 indistinct in the upper part of the cell. Cavity wide at the 

 base, narrow in the upper end. Cells contain but a small 

 amount of pigment; the walls are colorless, but color blue 

 rapidly with chlor-iodide of zinc. Cells contain a small amount 

 of tannin. 



Osteosclerid, This layer is suppressed. 



Nutrient, Cells thin-walled and elongated, containing a 

 reddish and a yellow pigment. The cells above are larger. 

 The lignified vascular elements occur in the nutrient layer 

 above the mycotic. A second part of the nutrient layer below 

 the mycotic is thick-walled and compressed, containing a yellow 

 pigment and an abundance of tannin. 



Mycotic. This layer is compressed. The cells are thin- 

 walled and elongated, star-shaped, colorless, and without 

 pigment. 



Endosperm, This layer is reduced to a single row of thick- 

 walled cells, the aleurone, containing protein. 



Embryo, Cells of the outer row with the exterior walls 



