. Class-book of botany [microform] : being outlines of the structure, physiology, and classification of plants : with a flora of the United States and Canada. Botany; Botany; Plants; Plants; Botanique; Botanique; Plantes; Botanique. THE ROOT, OR DESCENDING AXIS. 27 128. Tjtk conical root tapers its whole lengtli, from tlio colhmi (lownwar s (carrot). 129. The napiform root, (turnip,) swells out in its upper part so that Its diameter equals or exceeds its length, as in Erigenia bulbosa (25), Turnips (28). 8* 80 81 w ^83. n,o^nm'foryrXri?^'n;L"''T'' T?" ^' «'"««"^-^»«'forn, r
. Class-book of botany [microform] : being outlines of the structure, physiology, and classification of plants : with a flora of the United States and Canada. Botany; Botany; Plants; Plants; Botanique; Botanique; Plantes; Botanique. THE ROOT, OR DESCENDING AXIS. 27 128. Tjtk conical root tapers its whole lengtli, from tlio colhmi (lownwar s (carrot). 129. The napiform root, (turnip,) swells out in its upper part so that Its diameter equals or exceeds its length, as in Erigenia bulbosa (25), Turnips (28). 8* 80 81 w ^83. n,o^nm'foryrXri?^'n;L"''T'' T?" ^' «'"««"^-^»«'forn, root. 82, Pelargonium triste-, tiouVrootr '^ flKpendula-noUulose root. 84, A creeping adrenti- 130. The forms of inaxial roots are fibrous, fibro-tuberous, tu- bercular, coralme, nodulous, moniliform. 131 The fibrous root consists of numerous thread-like divisions sent off directly from the base of the stem, with no main or tap-root. Such are the roots of most grasses, which multiply their fibres exces- sively in light sandy soils. 132. FiBRo-TUBERous ROOTS (oT fasciculate). Inaxial roots are so called when some of the fibres are thick and fleshy, as in the asphodel, crow-foot, pseony. Orchis, Dahlia. When the fibre is enlarged in cer- tain parts only, It IS NODULOUS, and when the enlargements occur at regular intervals, it is moniliform (necklacc-like). When it bears little tubers hero and there, as in squirrel-corn (Dicentra Canadensis), it is TUBERCULAR. ' 133 Deposits of starch, or farinaceous matter, in all these cases, constitute the thickening substance of the root, stored up for the future use of the plant. 134 Adventitious roots arc such as originate in some part of the ascending axis,—stem or branches, whether above or below the around Ihey are so called because their origin is indeterminate, both fn place and time. Examples are seen in the ground-ivy, twin-flower, and other creeping plants. Several special forms should be noticed • as. Please note
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