. Notes on the life history of British flowering plants. Botany; Plant ecology. ORCHIDACE^ 401 long. Some foreign species have more than one kind of flower. The above diagram (Fig. 328) illustrates the structure of an orchid flower. The seeds are numerous, and very minute. In some species the ovules are undeveloped or very rudimentary when the plant is in flower. According to Hildebrand/ in Dendrobium the formation of the ovules has not yet commenced, even the placentae are not fully developed, and it is not till four m-onths after the deposition of the pollen that the formation of the embryo
. Notes on the life history of British flowering plants. Botany; Plant ecology. ORCHIDACE^ 401 long. Some foreign species have more than one kind of flower. The above diagram (Fig. 328) illustrates the structure of an orchid flower. The seeds are numerous, and very minute. In some species the ovules are undeveloped or very rudimentary when the plant is in flower. According to Hildebrand/ in Dendrobium the formation of the ovules has not yet commenced, even the placentae are not fully developed, and it is not till four m-onths after the deposition of the pollen that the formation of the embryo begins. Orchis Of this genus we have ten species, of which Orchis masGula (Early Purple Orchis, Fig. 329) is perhaps the commonest, and I have therefore taken it as the type. It occurs in Southern and Central Europe as far as South Scandinavia. It is sometimes, but not always, scented. The leaves are spotted and broad. The flowers vary from pinkish purple to flesh-colour, sometimes pale or even white. They form a loose spike 3 to 6 inches long. Fig. 330 represents the side view of a flower from which all the petals and sepals have been re- moved, except the lip (/), half of which has been cut away, as well as the upper portion of the near side of the nectary (n). The pollen forms two masses (Figs. 331, a, and 332), each attached to a tapering stalk, which gives the whole an elongated pear-like form, and is attached to a round sticky disk (Fig. 332, d), which lies loosely in a cup-shaped envelope, the rostellum (r). This envelope is at first continuous, but the slightest touch ' "On the Impregnation in Orchids," Ann, of Nat. Sist. xii. (1863). 2 D. Fig, 329.—Orchis 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 Lubbock, John, Sir, 1834-1913. London, New York, Macmillan and Co. , Ltd.
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