. Textbook of botany. Botany. FLOWERS AND THEIR USES 267. there are some plants living in the water, such as the com- mon tape-grass (also known as "eel-grass" and "wild celery," Figs. 155 and 156), which depend upon currents of water to carry the pollen stigma. It is not the pollen alone of the tape- grass that is carried, however, but the whole staminate flower. This floats about, as the illus- tration shows, until it comes in contact with a pistillate flower. There are some plants whose flowers are polli- nated by humming birds and other birds, others are pol- lin
. Textbook of botany. Botany. FLOWERS AND THEIR USES 267. there are some plants living in the water, such as the com- mon tape-grass (also known as "eel-grass" and "wild celery," Figs. 155 and 156), which depend upon currents of water to carry the pollen stigma. It is not the pollen alone of the tape- grass that is carried, however, but the whole staminate flower. This floats about, as the illus- tration shows, until it comes in contact with a pistillate flower. There are some plants whose flowers are polli- nated by humming birds and other birds, others are pol- linated by snails and slugs, and a few in the tropics are pollinated by bats. 278. Pollination by the Wind. — It has already been pointed out that pollination by the wind is an extravagant method, because the pollen is scattered in a haphazard way and only an occasional grain can land upon a stigma. Never- theless, many angiosperms, as well as all g5Tnnosperms, depend upon the wind for pollination, and 3ret are very suc- cessful in forming seeds and in multipljdng their numbers. Wind-pollinated angiosperms are chiefly plants that grow in locations where the wind may well serve their purpose. If they are small, like the grasses and sedges, great numbers of plants of the same species commonly grow close to one another in places like meadows and marshes where the wind Fig. 156. — Staminate and pistillate flowers of the tape-grass. The staminate flowers are caught in a slight depression in the surface of the water about a pistillate flower, and the pollen of some of the stamens is thus brought into contact with the pistil. After \\' 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 Allen, Charles E. (Charles Elmer), b. 1872; Gilbert, Edward Martinius, joint author. Boston, New York [etc. ] D. C. Heath &
Size: 1675px × 1492px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1917
