. The classification of flowering plants. Plants. ELATINACEAE 205 formula Sn, Pn, An + n, Gii, n being 2, 3, 4 or 5. vSometimes the inner whorl of stamens is absent. The sepals are free or united at the base, the petals and stamens are free; sepals, petals and stamens persist till the fruit is ripe. The pistil is syncarpous; the number of chambers in the ovary and of the short free styles indicate the number of carpels present. The numerous ana- tropous ovules are arranged in two or more rows on a central column. Self-pollination has been observed in many cases, and in Elatine cleistogamy is k
. The classification of flowering plants. Plants. ELATINACEAE 205 formula Sn, Pn, An + n, Gii, n being 2, 3, 4 or 5. vSometimes the inner whorl of stamens is absent. The sepals are free or united at the base, the petals and stamens are free; sepals, petals and stamens persist till the fruit is ripe. The pistil is syncarpous; the number of chambers in the ovary and of the short free styles indicate the number of carpels present. The numerous ana- tropous ovules are arranged in two or more rows on a central column. Self-pollination has been observed in many cases, and in Elatine cleistogamy is known to occur. The fruit is a capsule. Fig. 99. A. Elatine Hydropiper, portion of plant. B. E. Alsinastrum, flower in leaf-axil, x 10. C. Flower of same seen from front, x 10. D. Floral diagram of E. hexandra. E. Fruit of E. Hydropiper in vertical section, x 12. s, stipules. (A, E after Seubert; D after Eichler.) with septifragal dehiscence. The seeds are straight or curved, with a hard or membranous, smooth or rugose coat enclosing a straight or bent embryo, which consists of a large radicle and hypocotyl and two small cotyledons. Endosperm is absent. The family is represented in our flora by two species of Elatine, both rare. E. hexandra is found on margins of ponds and lakes in the south of Scotland and in England (not in the eastern counties), and in north and west Ireland. It occurs also in Western and Central Europe and in the Azores. E. Hydropiper, another European plant, is very rare and in England and Ireland is recorded onl}^ from muddy ponds in a few 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 Rendle, A. B. (Alfred Barton), 1865-1938. Cambridge, University press
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectplants, bookyear1904
