Introduction to structural and systematic botany, and vegetable physiology, : being a 5th and revedof the Botanical text-book, illustrated with over thirteen hundred woodcuts . imple umbel. 387. A corymb being evidently the same as a raceme with ashort main axis, and an umbel the sameas a corymb with a still shorter axis,it is evident that the outer flowers ofan umbel or corymb correspond to thelowermost in the raceme, and that thesewill first expand, the blossoming pro-ceeding regularly from the base to theapex, or (which is the same thing) fromthe circumference to the centre. Thismode of dev
Introduction to structural and systematic botany, and vegetable physiology, : being a 5th and revedof the Botanical text-book, illustrated with over thirteen hundred woodcuts . imple umbel. 387. A corymb being evidently the same as a raceme with ashort main axis, and an umbel the sameas a corymb with a still shorter axis,it is evident that the outer flowers ofan umbel or corymb correspond to thelowermost in the raceme, and that thesewill first expand, the blossoming pro-ceeding regularly from the base to theapex, or (which is the same thing) fromthe circumference to the centre. Thismode of development uniformly takesplace when the flowers arise from axil-lary buds ; on which account the indefi-nite mode of inflorescence is also calledthe centripetal. 388. In all the foregoing cases, theflowers are raised on stalks, or these are wanting, or so short asnot to be apparent, a Spike or Head A Spike is the same as the raceme, except that the flowers are sessile ; as in the Plantain (Fig. 311) and Mullein. It is an in- FIG. 308. A raceme. 309. A corymb. 310. An umbel. FIG. 311. Young spike of Plantago major. 312. Catkin of White INDETERMINATE INFLORESCENCE. 213 determinate infloresence, with the primary axis elongated, and theflowers destitute of pedicels or with only very short ones. Twovarieties of the spike have received independent names, viz. theSpadix and the Ament. 390. A Spadix is a fleshy spike enveloped by a large bract or mod-ified leaf, called a Spathe, as in Calla palustris (Fig. 313), theIndian Turnip (Fig. 314), and the Skunk Cabbage (Fig. 1205).
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Keywords: ., bookauthorgra, bookcentury1800, bookdecade1860, booksubjectbotany
