. Class-book of botany : being outlines of the structure, physiology, and classification of plants ; with a flora of the United States and Canada . Botany; Botany; Botany. THE ROOT, OR DESCENDING AXIS. 21 128. The conical boot tapers its whole length, from the coUus) downwards (carrot). 129. The napiform root, (turnip,) swells out in its upper part so that its diameter equals or exceeds its length, as in Erigenia, Panax trifolium (25, 25). 84 30 81 3S 83. Figs. 30, PiEOny—ftbro-tuberous roots. 81, Ginseng—fusiform root. 32, Pelargonium trlst*— monlllform root. 33, Spirea filipendula—nodulose r
. Class-book of botany : being outlines of the structure, physiology, and classification of plants ; with a flora of the United States and Canada . Botany; Botany; Botany. THE ROOT, OR DESCENDING AXIS. 21 128. The conical boot tapers its whole length, from the coUus) downwards (carrot). 129. The napiform root, (turnip,) swells out in its upper part so that its diameter equals or exceeds its length, as in Erigenia, Panax trifolium (25, 25). 84 30 81 3S 83. Figs. 30, PiEOny—ftbro-tuberous roots. 81, Ginseng—fusiform root. 32, Pelargonium trlst*— monlllform root. 33, Spirea filipendula—nodulose root. 34, A creeping stem, with adventi- tious roots. 130. The forms of inaxial roots arc fihrous, fibro-tuberous, tu- bercular, coraline, nodulous, moniliform. 131. The fibrous root consists of numerous thread-lite divisions sent ofl" 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 (or fasciculatc). 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 (necklace-like). When it bears little tubers here and there, as in squirrel-corn (Diclytra 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 are such as originate in some part of the ascending axis,—stem or branches, whether above or below the ground. They are so called because their origin is indeterminate, both in place and time. Examples are seen in the ground-ivy, twin-flower, and other creeping plants. Several special forms should be noticed; Please note that these images are extracted from scann
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Keywords: ., bookcentury1800, bookdecade1860, bookpublisher, booksubjectbotany
