- Tabernæmontana, [296]
- coronaria, [504]
- Tacsonia pinnatistipula, [294]
- Tamus communis, [21]
- Taraxacum, [164] (see Leontodon)
- Taxodium, [114]
- distichum, [444]
- Taxus baccata, [11], [21], [90]
- Tetragonia, [113]
- Tetragoniaceæ, [149]
- Teucrium campanulatum, [226], [233], [238]
- Thalictrum, [205], [500]
- Thea, [295], [502]
- Thelymitra, [224]
- Thesium, [121], [123], [138], [150]
- Thlaspi arvense, [250], [271]
- Thuja occidentalis, [319]
- orientalis, [21]
- Thymus Serpyllum, [325], [405], [406]
- Thysselinum, [137], [365]
- Tigridia, [360], [361], [365]
- Tilia asplenifolia, [66], [459]
- Tiliaceæ, [137], [362]
- Tithonia, [26]
- Tofieldia, [296]
- calyculata, [300]
- Torenia scabra, [406]
- Torilis, [82], [149]
- Tradescantia, [245], [296], [360], [365], [367], [404]
- Tragopogon, [19], [20], [73], [114], [431]
- Trapa natans, [202], [364]
- Trichostomum rigidulum, [49]
- Trifolium, [106], [113], [121], [137], [139], [149], [295], [360], [364]
- Trifolium hybridum, [262], [399], [406], [407]
- Trillium grandiflorum, [507], [510]
- Trinia vulgaris, [405]
- Triphasia aurantiaca, [369]
- Triticum, [86], [115], [350], [391]
- Triumfetta, [137], [252], [259], [260], [262], [265], [271], [280]
- Trollius europæus, [66], [295], [500]
- Tropæolaceæ, [149], [501]
- Tropæolum, [149], [398], [283]
- Tulipa, [35], [45], [67], [75], [84], [85], [138], [262], [300], [302], [348], [359], [360], [361], [365], [367], [388], [390], [421]
- Turritis, [271]
- glabra, [252]
- Typha, [189]
U.
- Ulex, [295], [360]
- Ulmus americana, [66]
- Umbelliferæ, [37], [71], [73], [80], [107], [113], [121], [127], [131], [132], [137], [139], [140], [143], [149], [150], [162], [244], [257], [261], [339], [358], [395], [405], [406], [407], [437], [439]
- Uredo candida, [279]
- Urticaceæ, [114]
- Urtica dioica, [62], [66], [194]
- Usteria, [283]
V.
- Vaccinium, [68]
- Valantia cruciata, [44]
- Valerianaceæ, [114]
- Valeriana, [114], [165], [419]
- Valisneria spiralis, [319], [433]
- Verbascum, [73], [116], [137], [225], [253], [430]
- Verbena, [67], [68], [506]
- Veronica, [60], [150], [296], [334], [360], [361], [365], [375], [505]
- Viburnum, [44], [296], [417]
- Opulus, [473]
- Vicia, [30], [365], [369], [472]
- Faba, [434]
- Vinca, [137], [296]
- Viola, [23], [137], [225], [229], [289], [295], [297], [405]
- Violaceæ, [137], [334], [403], [406], [500]
- Viscum album, [56], [369], [509]
- Vitaceæ, [137]
- Vitex incisa, [238]
- Vitis, [417]
W.
- Wedelia perfoliata, [442]
- Weigela rosea, [358]
- Welwitschia, [162], adnot
- Wildenovia, [115], [167], [168]
- Wistaria, [364]
- sinensis, [226]
X.
Y.