. The classification of flowering plants. Plants. 286 FLOWERING PLANTS slightly grooved with a terminal undivided style. There are sometimes several ovules arranged in two rows (figs. 139, 140) in each carpel, but usually there are only two, which are collateral or superposed (fig. 141, D). The ovule has a ventral raphe and an upwardly pointing micropyle, but where two are superposed the micropyle of the upper is often directed. Fig. 139. A. Flower of Ruta graveoleyis in vertical section, xo; d, disc. B-F. Dictammis albus. B. Flower. C. Vertical section shewing ovary and gyno- phore, X 5. D. F
. The classification of flowering plants. Plants. 286 FLOWERING PLANTS slightly grooved with a terminal undivided style. There are sometimes several ovules arranged in two rows (figs. 139, 140) in each carpel, but usually there are only two, which are collateral or superposed (fig. 141, D). The ovule has a ventral raphe and an upwardly pointing micropyle, but where two are superposed the micropyle of the upper is often directed. Fig. 139. A. Flower of Ruta graveoleyis in vertical section, xo; d, disc. B-F. Dictammis albus. B. Flower. C. Vertical section shewing ovary and gyno- phore, X 5. D. Fruit dehiscing. E. Chamber of fruit in section. F. Seed, x 4. (After Engler.) downwards. Sometimes only one ovule is present. The genus Feronia affords a striking exception in having a syn- carpous ovary with many parietal placentas on which numerous ovules are arranged in many rows. The flowers of most Rutaceae are well-arranged for pollina- tion by insect-agency; the coloured corolla rendering them conspicuous and the disc secreting a supply of easily accessible nectar. Cross-pollination is often favoured by the marked. 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
