. Foundations of botany. Botany; Botany. ECOLOGY OF FLOWERS 85T called nectaries. The pouches at the bases of columbine petals are among the most familiar of nectaries. 428. Odors of Flowers. — The acuteness of the sense of smell among insects is a familiar fact. Flies buzz about the wire netting which covers a piece of fresh meat or a dish of syrup, and bees, wasps, and hornets will fairly besiege the window screens of a kitchen where preserving is going on. Many plants find it possible to attract as many insect visitors as they need without giving off any scent, but small flowers, like the m
. Foundations of botany. Botany; Botany. ECOLOGY OF FLOWERS 85T called nectaries. The pouches at the bases of columbine petals are among the most familiar of nectaries. 428. Odors of Flowers. — The acuteness of the sense of smell among insects is a familiar fact. Flies buzz about the wire netting which covers a piece of fresh meat or a dish of syrup, and bees, wasps, and hornets will fairly besiege the window screens of a kitchen where preserving is going on. Many plants find it possible to attract as many insect visitors as they need without giving off any scent, but small flowers, like the mignonette, and night- blooming ones, like the white tobacco and the evening primrose, are sweet-scented to attract night-flying moths. It is interesting to observe that the majority of the flowers which bloom at night are white, and that they are much more generally sweefc^cented than flowers which bloom during the day. A few flowers are carrion-scented (and purplish or brown- ish colored) and attract flies. 429. Colors of Flowers. — Flowers which are of any other color' than green probably in most cases display their colors to attract insects, or occasionally birds. The principal color of the flower is most frequently due to showy petals; sometimes, as in the marsh marigold, it belongs- to the sepals; and not infre- quently, as in some cornels and Eu- phorbias-(Fig. 245), the involucre is more brilliant and conspicuous than any part of the flower strictly so called. Different kinds of insects appear to be especially attracted by different colors. In general, dull yellow,. Fig. 250. — Stamens and Pistil of the Grape (magnified), with a Hectar Gland, g, be- tween Each Pair of 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 Bergen, Joseph Y. (Joseph Young), 1851-1917; Eastwood, Alice, 1859-1953
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