1918] DUDGEON—RUMEX CRISPUS 405 
T 
Fics. 11-15.—Various degrees of degeneration in flower: figs. 11, 12, transverse 
sections of flowers at tetrad stage of microspores, showing indiscriminate failure of 
anthers; at a, fig. 12, a loculus disorganized early, while other three are developing 
normally; fig. 13, ovary well developed, ovule just beginning to collapse, and embryo 
sac with small amount of completely disorganized endosperm; fig. 14, both embryo 
bundle also shown; figs. 11, 12, X50; figs. 13-15, X155- 
