. Nature-study; a manual for teachers and students. Nature study. LESSONS WITH PLANTS 33'^ a scale and large pistil. These flowers, compared wilh a flower like a rose, are very incomplete, yet they have the essen- tial things necessary for seed making. The pistillate cat- kins become long clusters of green berry-like fruit. Later in summer the pods ripen, become papery in texture, and final- ly split open, let- ting out a mass of down-covered seed which floats away. Compare with these the flow- ers of trees like the butternuts, walnuts, and oaks. These have staminate flow- ers very similar to
. Nature-study; a manual for teachers and students. Nature study. LESSONS WITH PLANTS 33'^ a scale and large pistil. These flowers, compared wilh a flower like a rose, are very incomplete, yet they have the essen- tial things necessary for seed making. The pistillate cat- kins become long clusters of green berry-like fruit. Later in summer the pods ripen, become papery in texture, and final- ly split open, let- ting out a mass of down-covered seed which floats away. Compare with these the flow- ers of trees like the butternuts, walnuts, and oaks. These have staminate flow- ers very similar to those of the willows and cot- tonwoods, but in these the pistillate flowers are not in catkins, but are in clusters of a few or singly, and nearly sessile on the twig. They are, however, rudimentary in structure and do not possess a corolla or stamens. The acorns (ripe ovaries) are set in a scaly cup. Some acorns, hke those of the red oak, require two years for ripening. Hence we find on the fruiting branches pistillate flowers and also year-old acorns, but on wood of different years. Study the flowers of boxelders. These are not in catkins but in clusters and drooping masses, each floweret on a sep-. Fic. 130 Staminate Catkins of Cottonwood. (Pollen carried by wind.). 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 Holtz, Frederick Leopold, 1870-. New York, C. Scribner's Sons
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