Page:Darwin - The various contrivances by which orchids are fertilized by insects (1877).djvu/318

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*Mormodes ignea, structure of flower, 208–219; viscid secretion, 249; use of labellum, 276, 283


 * luxata, 219


 * Morren, on Vanilla aromatica, 91


 * Moths with attached pollinia, 21, 30, 31; intellect of, 37


 * Movements of pollinia, 271


 * Müller, Fritz, on Epidendreæ, 148; pollinium of Ornithocephalus, 159, 160; Sphinx moth, 163; contracted stigma, 171, 172; ovules of Epidendreæ and Vandeæ, 173; Catasetum mentosum, 206; bracteæ of the Oncidium secreting nectar, 266; labellum gnawed by insects 271; number of seeds in capsule of Maxillaria, 278; number of Orchideæ in South Brazil, 279; the orchideous tribes failing to be fertilised, 280; prepotency of pollen, 289


 * , Hermann, on fertilisation of Orchis mascula, 13; bees visiting the flowers of Orchis latifolia, 16; Nigritella angustifolia, 27; fertilisation of Orchids, 29; insects puncturing laburnum flowers, 41; Gymnadenia odoratissima, 68; Habenaria bifolia and chlorantha, 74; Epipactis rubiginosa, microphylla, and viridiflora, 102; Neottia nidus-avis, 125; Cypripedium calceolus, 231; secretion of nectar, 267


 * Musk Orchis, structure of flower, 59


 * Myanthus barbatus, 192, 199, 203; quite sterile, 205


 * Nectar, secretion of, by British Ophreæ, 37, 39; in foreign Orchids, 229; from bracteæ, 229


 * Nectary cut off to test the intellect of moths, 37; length of, in Angræcum sesquipedale, 265


 * Neotinia intacta, 27, 291


 * Neotteæ, 93; vessels of, 241


 * Neottia nidus-avis, 125; pollen-tubes, 258; partially self-fertile, 290


 * Nevill, Lady Dorothy, obligations to, 129


 * Nicotiana, stigma of, 249


 * Nigritella angustifolia, 27


 * Notylia, contracted stigma, 171


 * Odontoglossum, 156


 * Oliver, Prof., obligations to, 129


 * Oncidium, pollinia, 153, 156, 158; vessels of, 239; viscidity, 251; bracteæ secreting nectar, 266


 * unguiculatum, development of caudicles, 252


 * Ophreæ, 6; vessels of, 241


 * Ophrys apifera, structure of flower, 52; fertility of, 54–58; pollen, 259; self-fertilisation, 279, 291


 * arachnites, 51


 * aranifera, 50; imperfect fertilisation, 280


 * muscifera, transplanted, 32; structure, 45; fertility, 49; self-sterile, imperfectly fertilised by insects, 280


 * scolopax, 52, 292


 * Orchideæ, modifications in, 246


 * Orchis fusca, 15; imperfect fertilisation, 35; secretion of nectar, 37


 * hircina, 25; nectary, 39; movement of pollinia, 273


 * latifolia, 15; imperfect fertilisation, 35; secretion of nectar, 37; two distinct discs, 255


 * maculata, 15, 34; transplanted, 32; imperfect fertilisation, 35: secretion of nectar, 37, 39; two distinct discs, 255; rostellum, 255; number of seeds, 277, 278;


 * Orchis mascula, structure of flower, 6; movement of pollinia, 273; number of pollen-grains, 278


 * militaris, sterility of, 36; secretion of nectar, 37


 * morio, 15, 128; fertility of, in cold season, 33; secretion of nectar, 37, 39; number of pollen-grains, 278


 * pyramidalis, structure of flower, 16; movements of pollinia, 21, 272, 273; fertility in different stations, 84; secretion of nectar, 37, 39; monstrous flowers, 38; single disc, 254; rostellum, 256; pollen-grains, 260, 261; contrivances for its fertilisation, 264


 * ustulata, 25


 * Organs, gradation of, 247