720 



BOTANY 



PART II 



stalked panicles or umbels, and occur as marsh plants. The individual flowers 



FIG. 793. Floral diagram of 



Echinodorus parmilus, one FIG. 794. Sagittaria sagittifolia. a, Flower; b, fruit after 



of thei Alismaceae. (After removal of some of the carpels. (Magnified ; ft, after 



EICHLEK.) ENGLER and PRANTL.) 



have a calyx and a white (in Butomus, reddish) corolla. Androecium, with six or 



FIG. 795. Potamogeton natans. Flowering shoot. (3 nat. size.) 



more stamens. Gynaeceum apocarpous, with six or many carpels that may be in 

 whorls or spirally arranged (Fig. 793). Sagittaria is monoecious with flowers that, 



