. The classification of flowering plants. Plants. ACANTHACEAE 545 genera; they are found generally in the epidermal cells of the leaf and stem and their form is characteristic of single genera or tribes. The most frequent type of inflorescence is the cymose, namely dichasial passing into monochasial in the higher branching; it is often in the form of short axillary clusters. Spicate and racemose inflorescences are also frequent. Bracts and bracteoles are generally well developed and often brightly coloured, adding to the attractiveness of the Fig. 253. Acanthus mollis. A. Flowe
. The classification of flowering plants. Plants. ACANTHACEAE 545 genera; they are found generally in the epidermal cells of the leaf and stem and their form is characteristic of single genera or tribes. The most frequent type of inflorescence is the cymose, namely dichasial passing into monochasial in the higher branching; it is often in the form of short axillary clusters. Spicate and racemose inflorescences are also frequent. Bracts and bracteoles are generally well developed and often brightly coloured, adding to the attractiveness of the Fig. 253. Acanthus mollis. A. Flower, side view, x |; &, bract; s, posterior sepal; I, lateral sepal; c, corolla. B. Flower opened out, three petals form the lower lip, the upper lip is absent. C. One pair of stamens. D. A pollen-grain, X 450. E. Ovary in longitudinal section, x 2^. F. Capsule shewing the two valves; j, the jaculator. G. Seed in longitudinal section. H, Seed in trans- verse section. (After Lindau, except F.) In the Mendoncioideae and Thunbergioideae the bracteoles are large, forming an involucre round the tube of the flower. The structiu-e of the flower is very miiform. In Thiinbergia the calyx is often reduced to a narrow seam, its protective function being transferred to the large bracteoles. The corolla has a longer or shorter often slender tube which passes above into an almost equally five-lobed limb, as in Thiinbergia, the large genus Ruellia and many other genera, or the limb is more or less deeply two-Upped. The upper Up is generally R. 11. 35. 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
