. 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. 40 THE STEM, OR ASCENDING AXIS. 189. The corm is an under-ground, solid, fleshy stem, witli con- densed internodes, never extending, but remaining of a rounded form covered with thin scales. It is distinguished from roots by its leaf-bud, •which is either borne at the summit, as in the crocus, or at the side, as in the colchicum and putty-root (Aplectrum). 190. HoTV THE COEM GROWS. The corm usuully accomplishes its part in ve
. 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. 40 THE STEM, OR ASCENDING AXIS. 189. The corm is an under-ground, solid, fleshy stem, witli con- densed internodes, never extending, but remaining of a rounded form covered with thin scales. It is distinguished from roots by its leaf-bud, •which is either borne at the summit, as in the crocus, or at the side, as in the colchicum and putty-root (Aplectrum). 190. HoTV THE COEM GROWS. The corm usuully accomplishes its part in vegeta- tion in one or two seasons, and then gradually yields up its substance and life for the nourishment of the new progeny fonned from the axils of its upper scales in case of the Crocus and Gladiolus, or the single new corm from the axil of a lateral scale, as in 5T, Corms of putty-root (Apleotiutn) ; a, of laat year, 6, of the j)rcscnt year. 58, Scale bulb of white lily. 59, Scale bulb of Oxalis violacea. 191. The Bulb partakes largely of the nature of the bud. It con- sists of a short, dilated axis, bearing an oval mass of thick, fleshy scales closely packed above, a circle of adventitious roots around its base, and a flowering stem from the terminal, or a lateral bud. 192. How MULTIPLIED. Bulbs are renewed or multiplied annually at the ap- proach of winter by the development of bulbs from the axils of the scales, which increase at the expense of the old, and ulti- mately become detached. Bulbs which flow- er from the terminal bud are necessarily either annual or biennial: those flowering from an axillary bud may be perennial, as the termi- nal bud may in this case continue to develop new scales indefinitely. 193. Bulbs are said to be tunicated when they consist of concentric layers, each entire and enclosing all within- it, co. Bulb of Liiium superbnm, with haWt as in the onion. But the more com- "^ " rhizome; a, fUll-grown bulb sending . j^ . ., 7
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