. A text-book of botany for secondary schools. Botany. SEED-DISPERSAL 257 This method may be regarded as the poorest of all the methods of dispersal, for at the very best no seed-vessel can discharge its seeds more than a very short distance. 152. Dispersal by currents of air.—Many seeds are so light as to be carried about by currents of air. Ordinarily, however, the wind-dispersed seeds or fruits develop special appendages to aid in their flight, commonest among which are wings and tufts of hair. For example, wings are de- veloped by the fruit of ma- ples (Fig. 250) and elms, and by the seeds
. A text-book of botany for secondary schools. Botany. SEED-DISPERSAL 257 This method may be regarded as the poorest of all the methods of dispersal, for at the very best no seed-vessel can discharge its seeds more than a very short distance. 152. Dispersal by currents of air.—Many seeds are so light as to be carried about by currents of air. Ordinarily, however, the wind-dispersed seeds or fruits develop special appendages to aid in their flight, commonest among which are wings and tufts of hair. For example, wings are de- veloped by the fruit of ma- ples (Fig. 250) and elms, and by the seeds of catalpa and its alHes (Fig. 251). Plumes and tufts of hair are devel-. 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 Coulter, John Merle, 1851-1928. New York, D. Appleton
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