Introduction to structural and systematic botany, and vegetable physiology, : being a 5th and revedof the Botanical text-book, illustrated with over thirteen hundred woodcuts . terminal bud, is in turn consumed by itsown offspring; and so on. In Fig. 181, wehave at one view, a, the dead and shrivelledcorm of the year preceding; b, that of thepresent season (a vertical section); and c,*S2 ° the nascent bud for the growth of the ensuing season. Many of the forms which the stem assumes when aboveground differ as much from the ordinary appearance as do any ofthese subterranean kinds, and, in fact,
Introduction to structural and systematic botany, and vegetable physiology, : being a 5th and revedof the Botanical text-book, illustrated with over thirteen hundred woodcuts . terminal bud, is in turn consumed by itsown offspring; and so on. In Fig. 181, wehave at one view, a, the dead and shrivelledcorm of the year preceding; b, that of thepresent season (a vertical section); and c,*S2 ° the nascent bud for the growth of the ensuing season. Many of the forms which the stem assumes when aboveground differ as much from the ordinary appearance as do any ofthese subterranean kinds, and, in fact, imitate their peculiarities; as,for example, the globular Melon-Cactus and Mamillaria, the colum-nar Cereus, and the jointed Opuntia or Prickly Pear. These areremarkably 194. Consolidated Forms Of Vegetation. While ordinary plants areconstructed on the plan of great expansion of surface, these are FIG. 182. Corm of Crocus, the few thin enveloping scales removed, showing the shrivelledvestige of the last years corm at the base, and buds developing into new ones on variousparts of its surface. 182Q. Vertical section of a similar corm, with a terminal and one CONSOLIDATED FORMS OF VEGETATION. Ill formed on the plan of the least possible amount of surface in pro-portion to their bulk. A green rind serves the purpose of foliage;but the surface is as nothing compared with an ordinary leafy plantof the same amount of vegetable material. This consolidation iscarried to the extreme in the Melon-Cactus, Mamillaria, and thelike, of globular or corm-like shapes ; their spherical figure beingthat which exposes the least possible part of the bulk to the plants are evidently adapted and designed for very dryregions; and in such only are they naturally found. Similarly,bulbous and corm-bearing plants, and the like, are a form of vege-tation which in the growing season may in the foliage expand alarge surface to the air and light, while during the period of restthe livin
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Keywords: ., bookauthorgra, bookcentury1800, bookdecade1860, booksubjectbotany
