STARCH IN THE LEGUMINOS^ 255 



Phaseolus helvolus (Amberique).— Seeds rich in starch. Shape 

 fairly uniform and size rather variable. All the grains polarize 

 distinctly. The hilum is very distinct, it does not appear in a few 

 small grains; it is linear, sometimes curved, very rarely branched. 

 Striations only slightly visible. Starch fairly homogeneous. 



Phaseolus vulgaris (Red Variety).— Seeds rich in starch. Shape 

 fairly uniform, and size rather variable. No polarization is observed. 

 The hilum, which is most distinct, is either linear or slightly bent. 

 Striations invisible. Starch fairly homogeneous. 



Phaseolus vulgaris (White Variety). — Seeds rich in starch. The 

 shape of the grains is fairly uniform, but they vary more in size than 

 those of the red variety, the large grains predominating. No polariza- 

 tion. The hilum is very distinct, linear, often considerably bent, rarely 

 branched. Striations invisible. Starch only slightly homogeneous. 



Psophocarpus tetragonolobus (Pois carre).— Seeds poor in starch. 

 Grains of irregular shape and variable size. The hilum is linear, very 

 conspicuous in some and only slightly visible in others. Starch only 

 slightly homogeneous. 



Psophocarpus tetragonolobus (Pois carre; Roots). — Roots rich in 

 starch. The shape of the grains is very variable, but often like that of 

 a bell, and their size is equally variable; the large grains, however, 

 predominating. All the grains polarize. The hilum, which only 

 occurs rather seldom, is stellate and punctiform, rarely linear. Stria- 

 tions invisible. Starch only very slightly homogeneous. 



Soja hispjda. — Soy contains very little starch. The shape of the 

 grains is fairly uniform, whilst their size is very variable. All 'he 

 grains polarize clearly. The hilum is linear, occasionally stellate, 

 but of rather rare occurrence. The striations are only visible at the 

 edges and are very close together. Starch only very slightly homo- 

 geneous. 



Vigna Catjang (Cowpeas, Black-eyed). — Seeds rich in starch. The 

 shape of the grains is very variable, similarly their size. Both the 

 smallest and the largest grains polarize clearly. The hilum is linear, 

 frequently branched, and very irregular in appearance. The striations 

 are not visible, or at least only with difficulty. Starch only very 

 slightly homogeneous. 



Vigna Catjang (Grey Cowpeas). — Seeds rich in starch. The shape 

 of the grains appears to be considerably more variable than in the 

 preceding variety, similarly the size. Polarization is general. The 

 hilum is linear and branched, sometimes dividing the grain into two ; 

 it is most variable both as regards shape and position. Striations 

 scarcely visible. Starch only slightly '^.omogenecus. 



Vicia faba (Bean). — Seeds rich in starch. The shape and size of 

 the grains are very variable; a certain number of very large grains 



