. Class-book of botany : being outlines of the structure, physiology, and classification of plants ; with a flora of the United States and Canada . Botany; Botany; Botany. THE FLORAL OROANS. 81 393. CoNVOL0TE, when each leaf wholly involves all that are within it, as do the petals of Magnolia; and vexillary, when one piece larger than the rest is folded over them, as in the pea (251). 394. Plicate or folded estivation occurs in tubular or monopetalous flowers, and has many varieties, of which the most remarkable is the supervolute, where the projecting folds all turn obliquely in the same dire
. Class-book of botany : being outlines of the structure, physiology, and classification of plants ; with a flora of the United States and Canada . Botany; Botany; Botany. THE FLORAL OROANS. 81 393. CoNVOL0TE, when each leaf wholly involves all that are within it, as do the petals of Magnolia; and vexillary, when one piece larger than the rest is folded over them, as in the pea (251). 394. Plicate or folded estivation occurs in tubular or monopetalous flowers, 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, Joffersonin dipiylla r o, ovary; «, .«ti- mens; a, inner vow of petals, sestivation triquetrous; B, outer row of petals, ajstivation cuntortert ; e, sepals, estivation quincuntial. 254, Lily. 255, Strawberry. 256, Mustard. The pupil will designate the modes of lestivatioa. The Eestivation of the sepals often differs from that of tho petals in the sanne flower. Thus, in the pink the sepals are imbricated and the petals contorted. :i95. The positigs' on the parts of the flower, with respect to the main axLs and the bract whence it arises, is often important in description. That part wliich ia adjacent to the axis is the posterior or upper, while that which looks to- ward the bract is the anterior or lower part. THE FLORAL ORGANS. 396. Tbchnicai, definition of the flower. The 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 may consist of the following members : 1, the floral envelops ; 2, the
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