. Elementary botany [microform]. Botany; Botanique. Figs. 44-47.—Cross-sections of stems showlns; annual thickening rings of wood. Fig. 44 is Olio year old. l''i,t;. 45 is two years old. Fi^. 46 is three years old. Fig. 47 is five years old, and shows the hark peeling off. i denotes wood formed in the first year ; 2, the wood formed in the second year; and so on. by the lighter-coloured splint<vood. Still looking at the section of the trunk, we note that there are a number of ring-like markings ranged round the centre. We find that in a two-year- old stem there are two rings, in a t
. Elementary botany [microform]. Botany; Botanique. Figs. 44-47.—Cross-sections of stems showlns; annual thickening rings of wood. Fig. 44 is Olio year old. l''i,t;. 45 is two years old. Fi^. 46 is three years old. Fig. 47 is five years old, and shows the hark peeling off. i denotes wood formed in the first year ; 2, the wood formed in the second year; and so on. by the lighter-coloured splint<vood. Still looking at the section of the trunk, we note that there are a number of ring-like markings ranged round the centre. We find that in a two-year- old stem there are two rings, in a three-year-old stem three rings; in fact, that the number of rings corresponds with the number of years of growth of that portion of the stem. For this reason the rings are termed antmal rings. Each ring denotes one year's growth in the thickness of the stem. There are also numberless radial lines which are the medullary rays. The knots met with on cutting across timber are the remains of portions of branches, which have been buried in the wood as the stem thickened. 1 SUBTERRANEAN SHOOTS. A stem may protrude into the air and be sub-aerial; or live under water and be siibmergcd; or lie buried in the soil and be siihtcrra7iean. In the case of many plants only a part of the shoot is raised. 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 Groom, Percy, 1865-1931; Penhallow, D. P. (David Pearce), 1854-1910. A manual of the more common herbaceous plants of Quebec and Ontario; Gray, Asa, 1810-1888. Elements of botany. Toronto : Copp, Clark
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