. 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. 64 THE ROOT. 400. Forest trees, being less exposed to the assaults of the wind, are much less firmly rooted than those in open situations. 145. Fusiform (spindle-shaped). It consists of a thick, fleshy caudex, tapering downwards, and also, for a short space, up- wards. It sends off from the sides and extremity, thread-like fi
. 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. 64 THE ROOT. 400. Forest trees, being less exposed to the assaults of the wind, are much less firmly rooted than those in open situations. 145. Fusiform (spindle-shaped). It consists of a thick, fleshy caudex, tapering downwards, and also, for a short space, up- wards. It sends off from the sides and extremity, thread-like fibrils, which are in fact its true roots, since they alone absorb nourishment from the ground. Ex. parsnip, FIG. 30. — Forms of the root; 7, branching roots of r tree; 8, root of Daucus; 9, Oxalis ; 10, Orchis. a. When the fusiform root divides into two principal branches, it is said to be forked. When it tapers from the collum downwards its whole length, it is called a conical or tap root. But its most remarkable variety is the b. JPremorse, in wliich the caudex terminates abruptly below, as if it had been bitten of (prsemorsus). This is due to the fact that the lower extremity perishes after the first year. Ex. Viola pedata, and Scabiosa succisa. c. The napiform (turnip-shaped) root is another variety of the fusiform, where the upper portion sweUs out, so that the diame- ter is greater than the length. Ex. turnip. 146. The fibrous root consists of numerous thread-hke divis- ions, sent off directly from the base without any caudex. Such are the roots of most grasses, which multiply their fibres exceed- ingly in a hght sandy soil. a. A fasciculated root is a variety of the fibrous, with some of its fibres thickened, as in the crow-foot (Ranunculus), peony, Dahlia, &c. 147. A tuberous root consists of one or more fleshy knobs, or. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration
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Keywords: ., bookcentury1800, bookdecade1840, booksubjectbotany, bookyear1848
