. Plant life and plant uses; an elementary textbook, a foundation for the study of agriculture, domestic science or college botany. Botany. MORE ABOUT POLLINATION 313 obtained by any visiting insect. Regular flowers whose corollas form a tube are somewhat more select as to their visitors; only insects with elongated mouth parts are able to reach the nectar without breaking the wall of the tube. (See Figure 132.) Sometimes bees, wasps, or ants reach. Fig. 133. —• Pollination in Salvia. A, lengthwise section of the flower; s, the un- ripe stigma; a, the ripe anther; the arrow points to a lower a
. Plant life and plant uses; an elementary textbook, a foundation for the study of agriculture, domestic science or college botany. Botany. MORE ABOUT POLLINATION 313 obtained by any visiting insect. Regular flowers whose corollas form a tube are somewhat more select as to their visitors; only insects with elongated mouth parts are able to reach the nectar without breaking the wall of the tube. (See Figure 132.) Sometimes bees, wasps, or ants reach. Fig. 133. —• Pollination in Salvia. A, lengthwise section of the flower; s, the un- ripe stigma; a, the ripe anther; the arrow points to a lower arm of the stamen; by pushing back this arm the visiting bee forces the anther down upon its own back. B shows the position of the anther when the lower arm of the stamen is pushed back. C shows a bee at work. D is an older flower in which the stigma, now ripe, is ready in its_turn to be brushed by the back of the bee. — After Kerner and Avebury. the nectar of such flowers by biting holes through the corolla tubes near the bottom. Such holes are often seen in the corolla tubes of the trumpet creeper, a plant whose flowers are frequently visited by humming birds. Flowers with zygomorphic corollas are, as a rule, depend- ent for pollination upon certain kinds of insects, and it is the bees upon which such dependence is principally placed. Zygomorphic flowers are characteristic of the legumes (pea. 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 G. (John Gaylord), b. 1876. New York, American Book Co
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1913
