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

298

mormodes.

INDEX.

organs.

298

• 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