Elementary botany . Fig. of geum showing the hooklets where the end of the style is kneed. grains are also devoured, and while many such seeds are destroyed, othersare not injured, and finally are lodged in suitable places for growth, oftenremote from the original locality. Thus animals willingly or unwillinglybecome agents in the dissemination of plants over the earth. Man in thedevelopment of commerce is often responsible for the wide distribution ofharmful as well as beneficial species. 894. Other plants are more independent, and mechanisms are employedfor violently ejecting seeds
Elementary botany . Fig. of geum showing the hooklets where the end of the style is kneed. grains are also devoured, and while many such seeds are destroyed, othersare not injured, and finally are lodged in suitable places for growth, oftenremote from the original locality. Thus animals willingly or unwillinglybecome agents in the dissemination of plants over the earth. Man in thedevelopment of commerce is often responsible for the wide distribution ofharmful as well as beneficial species. 894. Other plants are more independent, and mechanisms are employedfor violently ejecting seeds from the pod or fruit. The unequal tension ofthe pods of the common vetch (Vicia sativa) when drying causes the valvesto contract unequally, and on a dry summer day the valves twist and pull inopposite directions until they suddenly snap apart, and the seeds are thrownforcibly for some distance. In the impatiens, or touch-me-not as it is betterknown, when the pods are ripe, often the least touch, or a pinch, or jar
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Keywords: ., bookauthoratk, bookcentury1900, bookdecade1900, booksubjectbotany
