. The essentials of botany. Botany. PHANBROOAMIA. <iQQ hibiting several divergent groups, the one containing the Asterald Cohort rising highest. In such an arrangement the orders of the Apetalse would be placed as degraded or simplified offshoots mainly from the Choripetalse, while a few would doubtless be regarded as directly lower than and preceding the latter group. 537. A great many Dicotyledons show adaptations for pollination by insect agency, and it is safe to say that more than half the species are more or less dependent upon the visits of insects in order that their ovules may be f
. The essentials of botany. Botany. PHANBROOAMIA. <iQQ hibiting several divergent groups, the one containing the Asterald Cohort rising highest. In such an arrangement the orders of the Apetalse would be placed as degraded or simplified offshoots mainly from the Choripetalse, while a few would doubtless be regarded as directly lower than and preceding the latter group. 537. A great many Dicotyledons show adaptations for pollination by insect agency, and it is safe to say that more than half the species are more or less dependent upon the visits of insects in order that their ovules may be fertilized. In a general way it may be said that the showy flowers with a bright calyx or COrol- Fiq. (Piunuscerasus), with 1 1 .r IT i J clustered flowers. la, or both, are pollinated by insects, while those without showiness are wind-polli- nated, or close-fertilized. The plants of the Apetalous orders are for the most part not visited by insects; few of them have bright colors, and few produce nectar. 538. The simpler Choripetalse, as the Crowfoots (Fig. 143) and their near allies, attract insects by their showy perianth, and the nectar they secrete. Cross-fertilization is generally secured by a difference in the time of maturity of stamens and pistils (, by dichogamy), apparently, however, often permitting close fertilization. The same IS true in general of most of the regular flowered Chori- petalse. Thus in the Roseworts (Fig. 144), while nectar is usually abundant and tbe flowers are generally sweet-. 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 Bessey, Charles E. (Charles Edwin), 1845-1915. New York : H. Holt and company, ;
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