ft. J. D. GRAHAM 229 



This character is difficult to make out and presumably refers to the 

 depression left by the base of the style. In the rices of the Central 

 Provinces this notch is found to be present or absent in the grains 

 of the same head. It may be that the true notch has been overlooked 

 in the present examination of the Central Provinces rices, but at 

 present it is not possible to use this as a diagnostic character. 



Embryo. 



The embryo occupies an oblique position on the side of the grain 

 covered by the glume. The embryo is normally the same colour 

 as the grain, but the portion occupied by it differs from the rest of 

 the grain in not being translucent. In certain cases the embryo, 

 instead of being of the same colour as the grain, is distinctly dark, 

 in the white rices a dark yellow and in red rices orange. 



Outline Classification. — The distinctions brought out in this 

 paper enable a comparatively simple classification to be made. 



All rices fall into one of two groups, viz., rices with a green leaf 

 sheath and those with a coloured leaf sheath. The second class may 

 be sub-divided into those with a red leaf sheath and those with a 

 purple leaf sheath. 



These classes further sub-divide on their vegetative characters, 

 those of the spikelet and those of the grain. In addition to these 

 morphological characters, the time of ripening, though not definite 

 enough to form a main point in the classification of rices from a large 

 area, is of considerable local importance. As already mentioned, 

 the special rices are fitted into the general scheme of classification. 

 They are so distinct that they may well be considered systematic 

 varieties. 



