. Lessons in botany. Botany. 294 ECOLOG V. the development of commerce is often responsible for the wide distribution of harmful as well as beneficial species. 460. Mechanisms for ejecting seeds?—Other plants are more independent, and mechanisms are employed for violently eject- ing seeds from the pod or fruit. The unequal tension of the pods of the common vetch (Vicia sativa) when drying causes, the valves to contract unequally, and on a dry summer day the valves twist and pull in opposite directions until they suddenly. Fig. 248. Touch-me-not (Impatiens fulva) ; side and front view of flower
. Lessons in botany. Botany. 294 ECOLOG V. the development of commerce is often responsible for the wide distribution of harmful as well as beneficial species. 460. Mechanisms for ejecting seeds?—Other plants are more independent, and mechanisms are employed for violently eject- ing seeds from the pod or fruit. The unequal tension of the pods of the common vetch (Vicia sativa) when drying causes, the valves to contract unequally, and on a dry summer day the valves twist and pull in opposite directions until they suddenly. Fig. 248. Touch-me-not (Impatiens fulva) ; side and front view of flower below ; above unopened pod, and opening to scatter the seed. snap apart, and the seeds are thrown forcibly for some distance. In the impatiens, or touch-me-not, as it is better known, when the pods are ripe, often the least touch, or a pinch, or jar, sets the five valves free, they coil up suddenly, and the small seeds are whisked for several yards in all directions. During autumn, on dry days, the pods of the witch hazel contract unequally, and the valves are suddenly spread apart, when the seeds, as from a catapult, are hurled away. Other plants have learned how useful the '' wind '' may be if. 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 Atkinson, George Francis, 1854-1918. New York, H. Holt and company
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