ON LEAVES. 105 
of this plant. The ligula is represented by the letters L.g, at 
the base and internal face of the leaf, which is sheathed like all 
the grasses. Here the leaf-stalk or petiole has its origin in one of 
the nodes of the stem; while at L.g, the apex of the sheathing 
petiole, there is a small membrane which appears to be a continua- 
tion of the inner lining of the petiole beyond the origin of the 
lamina of the leaf. This is the collar, or ligula. 
Fig. 133,.—Ligula of Millet-grass. 
