Page:Darwin - The various contrivances by which orchids are fertilized by insects (1877).djvu/320

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* pactis latifolia, 101; Listera, 115, 123; colours attracting insects, 275; value of his work, 275
 * Stamens in Orchids, 242
 * Stanhopea, pollinia of, 155; labellum, 276
 * devoniensis, 171
 * oculata, 171
 * Stelis, use of the sepals, 274
 * racemiflora, 135
 * Sterility of English Orchids, 35
 * Stigma, viscidity of, in the Vandeæ, 152; utriculi, 197; gradation, 248; structure, 249
 * Stipa, movements of, 273
 * Structure, diversity of, 282, 285
 * Structure, importance of trifling details, 286, 287


 * Thelymitra, self-fertile, 291
 * carnea, 127; self-fertile, 280
 * longiflora, 127
 * Thomson, R. B., on Goodyera repens, 105
 * Tilley, H. A., on Vanilla aromatica, 91
 * Trevelyan, Sir C., on Bombus with attached pollen-masses from Cattleya, 145
 * Treviranus on the secretion of nectar, 41; on Bee Ophrys, 56
 * Trimen, R., obligations to, 40; on Bonatea speciosa, 76, 77; Disa grandiflora, 77, 78
 * Turnbull, Mr., obligations to, 129
 * Tway-blade, 115


 * Uropedium, 240
 * Utriculli of stigma, 197, 218


 * Vandeæ, 156
 * , structure of, 149; pollinia, 253, 258
 * Vanilla aromatica, 90
 * Vanillideæ, 90; few seed capsules produced, 281
 * Veitch, Mr. J., obligations to, 129, 180, 220
 * Vessels, spiral, of Orchids, 235
 * Viscidity of disc in British Ophreæ, 35; in Catasetum, 190
 * of rostellum and stigma, 248, 249


 * Waetcher on fertilisation of the Orchids, 2
 * Walker, Mr. F., obligations to, 100
 * Wallis, Mr., obligations to, 129
 * Warrea, 155; analysis of labellum, 270
 * Weale, J. Mansell, on Habenaria, 76; Bonatea, 77; Disa and Disperis, 78; Disa macrantha, 290
 * Weddell, Dr., on hybrids of Aceras, 26
 * Wright, Mr. C, on the movement of pollinia, 156


 * Zygopetalum mackai, 155