. Elementary biology; an introduction to the science of life . W5 Fig. 146. Fruits scattered by passing animals 7,beggar-ticks, or bur marigold {Bidensfrondosay, 2, burdock {Lappida echinatd); _?, small- flowered agrimony {Agrimonlapaiviflo7-a): 4, carrot {Daiiais caroia); j, enchanter's night- shade {Circaca littetiand)\ 6, cocklebur {Xanthitiin canadensis) \ 7, bur grass {Cciichnis trihitloidcs); 5. spike rush (Elcocharis ovata). (/, 4, 8, enlarged; 2, 6, reduced) Seeds that are inclosed in edible fruits are often distributed by being eaten by animals and then discharged from the intes- tine
. Elementary biology; an introduction to the science of life . W5 Fig. 146. Fruits scattered by passing animals 7,beggar-ticks, or bur marigold {Bidensfrondosay, 2, burdock {Lappida echinatd); _?, small- flowered agrimony {Agrimonlapaiviflo7-a): 4, carrot {Daiiais caroia); j, enchanter's night- shade {Circaca littetiand)\ 6, cocklebur {Xanthitiin canadensis) \ 7, bur grass {Cciichnis trihitloidcs); 5. spike rush (Elcocharis ovata). (/, 4, 8, enlarged; 2, 6, reduced) Seeds that are inclosed in edible fruits are often distributed by being eaten by animals and then discharged from the intes- tines without having suffered any injury. Cherries, black- berries, and other small fruits are commonly distributed by blackbirds, robins, thrushes, and other birds (see Fig, 147). From the point of view of the species, there are three factors in seed dispersal that are of fundamental importance : (i) the number of seeds that are scattered ; (2) the distance to which they are carried ; and (3) the final lodgment in a place favorable to germination and later growth and development.
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Keywords: ., bookcentury1900, bookdecade1920, bookpublishe, booksubjectbiology
