. Una classe-libro di botanica, progettato per college, accademie e altri seminari ... Illustrato da una flora del nord, centrale e stati occidentali; in particolare degli Stati Uniti a nord del Campidoglio, lat. 38 3/4. La botanica; piante -- Stati Uniti; piante -- Canada. 50 Il FLOWEll. §8. Di ESTIVATION. 108. ^Estivation (cestivus, d'estate) è un termine utilizzato da- botanici, per denotare tlie disposizione relativa dei vari organi del fiore mentre ancora sottosviluppato in bud. È lo stesso per il fiore-bud come vernation {vernus, della molla) è la foglia-bud. a. Le diverse modalità di un

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. A class-book of botany, designed for colleges, academies, and other seminaries ... Illustrated by a flora of the northern, middle, and western states; particularly of the United States north of the Capitol, lat. 38 3/4. Botany; Plants -- United States; Plants -- Canada. 50 THE FLOWEll. §8. OF ESTIVATION. 108. ^Estivation (cestivus, of summer) is a term used by- botanists, to denote tlie relative arrangement of the several organs of the flower while yet undeveloped in the bud. It is the same to the flower-bud as vernation {vernus, of the spring) is to the leaf-bud. a. The different modes of aestivation may be best observed in sections of the bud, made by cutting it in a horizontal direction. The most common varieties are the following. 1. Valvate; applied to each other by the margins only; as the petals of the Umbelliferse, the valves of a capsule, &c. 2. Convolute; when one is whoUy rolled in another, as in the petals of the wall-flower. 3. Quincuncial; when the pieces are five in number, of which two are exterior, two interior, and the fifth covers the interior with one margin, and has its other margin covered by the ex- terior, as in E-osa. 4. Contorted; each piece being oblique in figure, and over- lappmg its neighbor by one margui, its other margin being, in like manner, overlapped by that which stands next it, as the corolla of Apocynum. 5. Alternative; when, the pieces being in two rows, the inner is covered by the outer in such a way that each of the exterior rows overlaps half of two of the interior, as in the Lihaceae.. FIG. 15.—Estivation of the corolla; 1, Hydrangea; 2, Cheiranthus; 3, Rose (single); 4, Oxalis; 5, Lilium; 6, Pisum; 7, Lysiraachia; 8, Solanum; 9, calyx of the Rose. The last form, with 4 and 5, are also termed imbricate.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original

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• bookcentury1800
• bookdecade1840
• booksubjectbotany
• bookyear1848