. Introduction to botany. Botany. Flowers. 179. is readily dispersed from flower to flower at any depth. In the case of Vallisneria spiralis (see Figs. 95-96) the pistillate flowers rise to the surface on slender stems. The staminate flowers, which are formed under the water, break loose from their stems and float on the surface, the fig- 94- calyx consisting of boat-shaped Fruiting Scale or Carpel from a sepals which buoy the stamens rffo'rs'ow^g ^rvut"; above the surface, and allow them B, diagram of a longitudinal n ^ 1 • t 11 --I-11 . section of ^, seen from the side. to float high an
. Introduction to botany. Botany. Flowers. 179. is readily dispersed from flower to flower at any depth. In the case of Vallisneria spiralis (see Figs. 95-96) the pistillate flowers rise to the surface on slender stems. The staminate flowers, which are formed under the water, break loose from their stems and float on the surface, the fig- 94- calyx consisting of boat-shaped Fruiting Scale or Carpel from a sepals which buoy the stamens rffo'rs'ow^g ^rvut"; above the surface, and allow them B, diagram of a longitudinal n ^ 1 • t 11 --I-11 . section of ^, seen from the side. to float high and dry. The Sta- ,„ niicropyle; «, embryo sac. mens bend outward beyond the rim a, after bessey ; b, after Cald- of the calyx, and when the stami- nate and pistillate flowers are brought together by the wind or currents of water, the anthers come in contact with the stigmas and effect their pollination. The stem which bears the pistillate flowers then coils itself spi- rally and draws the flower to the bottom of the water, where the seeds may ma- ture undisturbed. 129. Adaptations to In- sects. — The most wonder- ful modifications of flowers found in those forms. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Stevens, William Chase, 1861-. Boston, D. C. Heath & Co.
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