. Class-book of botany: being outlines of the structure, physiology and classification of plants; with a flora of the United States and Canada. Botany; Plants; Plants. THE FLORAL ORGANS. 81 393. Convolute, when each leaf wholly involves all that are within it, as do the petals of Magnolia; and vexillary, when one piece larger than tbe rest is folded over them, as in the pea (251). 394. Plicate or folded aestivation occurs in tubular or monopetalous lowers, and has many varieties, of which the most remarkable is the supervolute, where the projecting folds all turn obliquely in the same directio
. Class-book of botany: being outlines of the structure, physiology and classification of plants; with a flora of the United States and Canada. Botany; Plants; Plants. THE FLORAL ORGANS. 81 393. Convolute, when each leaf wholly involves all that are within it, as do the petals of Magnolia; and vexillary, when one piece larger than tbe rest is folded over them, as in the pea (251). 394. Plicate or folded aestivation occurs in tubular or monopetalous lowers, and has many varieties, of which the most remarkable is the supervolute, where the projecting folds all turn obliquely in the same direction, as in morning-glory, thorn-apple (Datura).. Diagrams of flowers (as seen by cross-sections). 253, Jeffersonia diphylla: o, ovary; s, sta- mens ; d, inner row of petals, aestivation triquetrous; I, outer row of petals, {estivation contorted; e, sepals, aestivation quincuntial. 254, Lily. 255, Strawberry. 256, Mustard. The pupil will designate the modes of aestivation. Tho aestivation of the sepals often differs from that of tho petals in tho same flower. Thus, in the pink the sepals are imbricated and the petals contorted. 395. The position* on the parts op the flower, with respect to the main axis and the bract whence it arises, is often important in description. That part which is adjacent to the axis is the posterior or upper, while that which looks to- ward the bract is tho anterior or lower part. THE FLORAL ORGANS. 396. Technical definition of the flower. Tho flower is an as- semblage of leaves more delicately and variously formed, borne at the upper nodes of the axis where the internodes are undeveloped. This portion of the axis is called 397. The receptacle or torus. It is the axis of the flower situ- ated at the summit of the flower-stalk. Its form above is commonly that of a flattened or somewhat conical disk, the center of which cor- responds with the apex of the axis. 398. The flower mat consist of the following members : 1, the floral envelops ; 2, the essential f
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