. The classification of flowering plants. Plants. 120 FLOWERIXG PLANTS (of which sometimes 011I3' one is developed) and five carpels. Sagiiia shews a similar structm-e but the parts of the flower are often in fours (fig. 56, H). In Sagina apetala the petals are minute or absent. Cerastium has notched petals and in C. semideoaiidruin the inner whorl of stamens is usualh^ sup- pressed. In SteUaria (figs. 06, I, 57) the flower is usually 5-, rarely 4-merous, but the carpels are reduced to three. Con- siderable variation occurs in one and the same species. The common Chickweed {SteUaria media, fig
. The classification of flowering plants. Plants. 120 FLOWERIXG PLANTS (of which sometimes 011I3' one is developed) and five carpels. Sagiiia shews a similar structm-e but the parts of the flower are often in fours (fig. 56, H). In Sagina apetala the petals are minute or absent. Cerastium has notched petals and in C. semideoaiidruin the inner whorl of stamens is usualh^ sup- pressed. In SteUaria (figs. 06, I, 57) the flower is usually 5-, rarely 4-merous, but the carpels are reduced to three. Con- siderable variation occurs in one and the same species. The common Chickweed {SteUaria media, fig. 57) is a most variable. Fig. 57. SteUaria media. A. Branch with flowers. B. Flower, x 4. C. Capsule open, x4: five of the six teeth are seen. D. Seed cut lengthwise, x20; c, cotyledons; e, perisperm; r, radicle. (From Flor. Jam.) plant. The flower may have the formula S5, P5, A5 ^ 5, G3, or the antepetalous stamens ma^^ be absent (S5, P5, A5, G3) and also some (rarely all) of the antesepalous stamens, a common formula being So, P5. A3. G3. The petals, which are more or less deeply divided, are shorter than the sepals and sometimes altogether absent. In these genera the stamens are often shghtly perigynous. The many-ovuled one-celled ovarj^ becomes a capsular man3^-seeded fruit opening hy teeth which are generally tT\ice the number of the carpels (fig. 57, C). Other genera are Holosteum, Minuartia (Alsine),Arenaria and others; these differ in the number of the styles (three or four), the entire or notched form of the petals, and the number of valves in. 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
