. Nature and development of plants. Botany. DEVELOPMENT OF PLANTS 383 meaning that the pistil matures first. It must also be borne in mind, although the devices for effecting a crossing are almost universal among the various groups of angiosperms, that there are equally elaborate provisions for the transference of the microspores of perfect flowers to the stigmas of their own flower. This is called autogamy and would appear to be a provision for setting seed in case crossing fails. From the above discussion we might characterize the primitive. Fig. 263. Development of the perianth: A, inflores
. Nature and development of plants. Botany. DEVELOPMENT OF PLANTS 383 meaning that the pistil matures first. It must also be borne in mind, although the devices for effecting a crossing are almost universal among the various groups of angiosperms, that there are equally elaborate provisions for the transference of the microspores of perfect flowers to the stigmas of their own flower. This is called autogamy and would appear to be a provision for setting seed in case crossing fails. From the above discussion we might characterize the primitive. Fig. 263. Development of the perianth: A, inflorescence of Quercus or oak—mi, inflorescence with flowers bearing only microsporophylls; mg, inflorescence with flowers bearing megasporophylls. B, flower of oak, en- larged, consisting of several microsporophylls and a perianth of minute scale- like organs. C, flower of Erythronium or fawn lily. The perianth of six con- spicuous leaf-like organs. D, flower of Melandryum or day pink—ca, calyx of green sepals; c, corolla of five delicate petals. flowers as consisting usually of a large and indefinite number of sporophylls, spirally arranged receptacle which is suf- ficiently elongated as to permit the separate attachment of each organ. Following the development of this type of flower, there appeared as the next advance, minute outgrowths about the sporophylls, known as the perianth. In its simplest form this. 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 Curtis, Carlton Clarence, 1864-1945. New York, H. Holt
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