The flower and the bee; plant life and pollination . the water-parsley, plantsgrowing luxuriantly by the roadside, along the river, and in themeadow. The flowers differ very little in structure, and thespecies can be separated only by the aid of the mature of every kind are welcome, and no other family offlowers has so large a number and variety of visitors. Thenectar is fully exposed, and self-fertilization is prevented bythe anthers and stigmas maturing at different times. In theCompositce 126 species have either the ray or disk florets white.(Fig. 111.) In bicolored heads, or
The flower and the bee; plant life and pollination . the water-parsley, plantsgrowing luxuriantly by the roadside, along the river, and in themeadow. The flowers differ very little in structure, and thespecies can be separated only by the aid of the mature of every kind are welcome, and no other family offlowers has so large a number and variety of visitors. Thenectar is fully exposed, and self-fertilization is prevented bythe anthers and stigmas maturing at different times. In theCompositce 126 species have either the ray or disk florets white.(Fig. 111.) In bicolored heads, or capitula, where the rays arewhite and the disk flowers yellow, tliere can be no doubt thatthe white rays are derived from yellow-colored ancestors. Incrownbeard (Verbesina) all of the 5 species have yellow disks,but 1 has white and 4 yellow rays. In the genera everlasting(Antennaria) and cudweed (Gnaphalium) the yellowish-whiteflowers have retrograded and lost their original yellow hue. In the orchis, pea, mint, and figwort families there occur 242. Fig. 111. Mayweed. Anthemis Cohila Yellow centre with white raj-s, showing the advantage of white in rendering the flowers conspicuous THE FLOWER AND THE BEE many irregular white flowers, which have been derived fromyellow, red, and blue forms, partly as the result of retrogression,and partly because of the advantage arising from a contrast ofcolors between closely allied species blooming at the same is a white variety of the scarlet runner, and the bright-blue larkspur is sometimes white. Both white and pink flowershave been seen on a single plant of the snapdragon, and apure-white form of the bright-red Polygala is sometimes found,and also of the violet-blue pickerel-weed. Everywhere thereis ample evidence that a flower containing pigments may easilychange to white. Finally there are many small white flowers which are soli-tary, or at least not densely clustered. Some 5Q such speciesbelong to the pink family; they are l
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Keywords: ., bookcentury1900, bookdecade1910, bookpublishernewyorkcscribnerss
