File:Botany for high schools (1910) (20379768436).jpg

Title: Botany for high schools
Identifier: botanyforhighsch00atki (find matches)
Year: 1910 (1910s)
Authors: Atkinson, George Francis, 1854-1918
Subjects: Botany
Publisher: New York, H. Holt and Company
Contributing Library: Wellesley College Library
Digitizing Sponsor: Boston Library Consortium Member Libraries

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SEED DISPERSAL 20I the ground " right side up/' i.e., with the radicle of the embryo downward. In the dandelion the flower stem elongates just as the seed is ripening, so that the head is lifted up where the currents of air readily reach it. The bristles cf the pappus in many composites, at first straight, turn out at nearly right angles, like the spokes of a tiny wheel, so that it is more effective as a float. The so-called tumble weeds are rolled on the ground by the wind to great distances, and the seeds are scattered by the way. Some of these are the light, much branched grasses, which when ripe and dry are broken off by the wind and swept along on t he ground. The res- urrection " plant (Ly- copodium) is another example of a plant which is distributed by the wind. As it dries up during droughts it curls into a rounded mass, the roots are torn from the ground, it rolls along in the wind, and with the advent of rains takes root and grows again.
Text Appearing After Image:
Fig. 162. Lactuca scariola.

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