. The classification of flowering plants. Plants. RAN UNCULACE AE from a Nigella-hke flower. The stamens and carpels are spirally arranged and shew no trace of the median symmetry which is determined by the structure of the calyx and corolla. The calyx is arranged in the quincuncial whorl, so frequent in Dicotyledons, that is the second-developed sepal is median and j^osterior; in Delphinium this is spurred. There are originally, as in Nigella,. Fig. 67. A. Flower of Actaea spicata. B. Flower of Coptis trifolia. C. Flower of Myosurus minimus in vertical section. D. Flower of Aconitum Napellus
. The classification of flowering plants. Plants. RAN UNCULACE AE from a Nigella-hke flower. The stamens and carpels are spirally arranged and shew no trace of the median symmetry which is determined by the structure of the calyx and corolla. The calyx is arranged in the quincuncial whorl, so frequent in Dicotyledons, that is the second-developed sepal is median and j^osterior; in Delphinium this is spurred. There are originally, as in Nigella,. Fig. 67. A. Flower of Actaea spicata. B. Flower of Coptis trifolia. C. Flower of Myosurus minimus in vertical section. D. Flower of Aconitum Napellus in vertical section. E. Floral diagram of Delphinium. F. Fruit of Aconitum. G. Seed of same in vertical section, e, embryo; h, honey-leaf; n, endosperm. A, B, C, F and G variously enlarged. (A, B, C after Baillon; D after Warming.) eight honey-leaves, a pair opposite each of the three older sepals and one opposite each of the two younger sepals. Of these the four in the lower part of the flower are either suppressed or form slender functionless structures; the median lateral form attractive petal-like structures which have lost the nectar-secreting function but are closely associated in the insect-attracting function Aiith. 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
