Page:Darwin - The various contrivances by which orchids are fertilized by insects (1877).djvu/319

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*Ornithocephalus, 160
 * Ovaria of Orchids, 284
 * Oxenden, Mr. G. C, obligations to, 25; on Epipactis purpurata, 102


 * Parfitt, Mr., on attached pollinia, 31
 * Parker, Mr. R., obligations to, 129
 * Pedicel of pollinium, 253; elasticity of, 283
 * Percy, Dr., analysis of labellum of Warrea, 270
 * Peristylus viridis, secretion of nectar, 43, 63; rostellum, 255
 * Petals, uses of, 274
 * Phaius, 146
 * grandifolius, 280
 * Phalanopsis, viscidity of stigma, 153; movement of pollinia, 159; labellum, 276
 * amabilis, 159
 * grandiflora, 159; projection of labellum, 269
 * Platanthera, 75
 * chlorantha, 69
 * dilatata, 77
 * flava, 76, 77
 * hookeri, 75
 * hyperborea, 76; self-fertile, 291
 * Pleurothallis ligulata, 135
 * prolifera, 135
 * Pogonia ophioglossoides, 86
 * Pollen-masses, rudimentary in Monochanthus, 201; gradation of, 257, 288
 * Pollen-tubes emitted from anther, 258
 * Pollinia, movements of, in Orchis mascula, 12–15; in O. pyramidalis, 21; of the Vandeæ, 154; of Catasetum, ejection of, 184; attachment to rostellum, 251; gradation, 257; movements, 271
 * Pterostylis, nectary of, 232
 * longiflora, 87, 89
 * trullifolia, 86, 88; imperfect fertilisation in New Zealand, 280


 * Rodgers, Mr., obligations to, 129; on Myanthus and Monochanthus, 196; secretion of nectar in Orchids, 265; in Vanilla, 266
 * Rodriguezia secunda, 159
 * suaveolens, movement of pollinia, 156, 159
 * Rohrbach, Dr., on Epipogium gmelini, 103
 * Rostellum, a single organ in the Ophreæ, 45; of the Vandeæ, 150; aborted, 242; gradation of, 247; of Apostasia, 248; diversity of structure, 250; crest of, in the Ophreæ, 255; in Catasetum, 256
 * Rucker, Mr., obligations to, 129, 180, 192, 208


 * Saccolabium, viscidity of stigma, 153, 156
 * Saint-Hilaire, A. de, on pollen of Orchids, 259
 * Sarcanthus, labellum of, 276
 * parishii, 142
 * teretifolius, pollinia of, 154, 156; viscidity, 268
 * Scheinsaftblumen, 37
 * Schomburgk, Sir R., on Catasetum, 196
 * Scott, Mr., on flowers of Acropera, 168, 172; of Gongora, 169; nectar-receptacle, 269; number of seeds in capsule of Acropera, 278; prepotency of pollen, 289
 * Scudder, Mr., on Pogonia ophioglossoides, 86
 * Secretion of nectar, 36, 229, 265
 * Seeds, production and number of, 276, 277
 * Selenipedium palmifolium, 232
 * Self-fertilisation, summary on, 293
 * Sepals, uses of, 274
 * Serapias cordigera, 27
 * Sexes of Orchids, 196
 * Smith, Sir James, on position of flowers in Malaxis, 129
 * , Mr. G. E., on bees visiting the Bee Ophrys, 55
 * Sobralia macrantha, 91
 * Sophronitis, 146
 * Spider Ophrys, 50
 * Spiranthes australis, 114; labellum, 275; self-fertile, 291
 * autumnalis, structure of flower, 106–114; vessels of, 239
 * cernua, 111
 * gracilis, 111
 * Sprengel, C. K., on fertilisation of Orchis militaris, 36; secretion of nectar by Orchis, 36; on Epi-