Page:Popular Science Monthly Volume 68.djvu/63

Rh sessile (Fig. 5, c). This is accompanied by an increased difference between the flowers, as mentioned above. As modification progresses, the lower outer glume shortens and becomes thicker and more corneous. The palet and glume of the upper flower show a tendency to become

more reduced, while the lower flower becomes practically abortive, except that the palet and glume are still of normal size. In the first stage after the flower has become pistillate (Fig. 5, d and e), the two