. The botanical class-book, and flora of Pennsylvania, designed for seminaries of learning and private classes. of the whole flower,or of any set, is designated by the terms binary (in twos) ;trinary (in threes), as in most Endogenous plants; quater-nary (in fours ; quinary (in fives), the most prevalent modein plants of the Exogenous structure. Sometimes theyare designated by the following: bimerous in 2, trimerousin 3, tetramerous in 4, pentamerous in 5, and hexamerousin 6. TO JESTTVATION. ESTIVATION. 218. Aestivation (cestivus, the summer state,) is the termused to denote the manner in whic
. The botanical class-book, and flora of Pennsylvania, designed for seminaries of learning and private classes. of the whole flower,or of any set, is designated by the terms binary (in twos) ;trinary (in threes), as in most Endogenous plants; quater-nary (in fours ; quinary (in fives), the most prevalent modein plants of the Exogenous structure. Sometimes theyare designated by the following: bimerous in 2, trimerousin 3, tetramerous in 4, pentamerous in 5, and hexamerousin 6. TO JESTTVATION. ESTIVATION. 218. Aestivation (cestivus, the summer state,) is the termused to denote the manner in which the several parts of the-flower, especially the calyx and corolla, are arranged andenvelope each other, while yet in the bud. By some authors,it is also called perforation. The plan of perforation is bestseen in a transverse section of a flower bud, made by cuttingit in a horizontal direction. 219. There are two principal plans of aestivation, theimbricated, or spiral, and the valvate. 220. The Imbricated is by far the most common, andits varieties have received the following names : 104. 105. 106. 108.
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