Nature and development of plants . Fig. 277. Fig. 278. Fig. 277. Leaf of Solomons seal with closed venation, entire margins,and sessile upon the stem, i. c, without 278. Cross-section of stem of rush: v, vascular bundles; st, stereome. the seed by the elongation of the basal portion of the cotyledon,while the cotyledon remains in contact with the endosperm as afood-absorbing organ, being often highly modified to performthis work. An examination of a few of the more importantorders will give a better idea of the characteristics and variationsof the monocotyledons. 130. Pandanales,
Nature and development of plants . Fig. 277. Fig. 278. Fig. 277. Leaf of Solomons seal with closed venation, entire margins,and sessile upon the stem, i. c, without 278. Cross-section of stem of rush: v, vascular bundles; st, stereome. the seed by the elongation of the basal portion of the cotyledon,while the cotyledon remains in contact with the endosperm as afood-absorbing organ, being often highly modified to performthis work. An examination of a few of the more importantorders will give a better idea of the characteristics and variationsof the monocotyledons. 130. Pandanales, the Cat-tail Order.—The cat-tail, Typha,may be taken as an illustration of this order (Fig. 280). Theseplants live in wet and marshy places and present several varia-tions that adapt them to such conditions The main stem is arhizome that branches through the mud and sends up each springleafv stems. The rhizome grows on from year to year, and DEVELOPMENT OF PLANTS 369 owing to the decay of the older portions, the branches becomei
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