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Rh, 34; hardly exists in the interior, 339

Subgeneric or sectional names of natural groups proposed to form an essential part of the name, inserted between brackets, 274-5

Swan River, general view of the Botany of, 305; number of species collected there by Mr. Charles Fraser, 307; principal families contained in the collection, 307-8; observations on the geographical distribution of some of the more interesting families or species, 309

Tamarind of the banks of the Congo, probably of Asiatic origin, 156

Tapura referred to Chailleteæ, 126

Tasmannia, its remarkable stigma, 559

Taxus, origin of the berry in, 43

Terebintaceæ of Jussieu, made up of several orders and genera, 111

Terra Australis, general remarks on the botany of, 361; nature of the different parts visited by Mr. Brown and Mr. Ferdinand Bauer, 4—6; number of species of plants found in, by Mr. Brown, by Sir Joseph Banks, by Mr. David Nelson, by Mr. Menzies, by Colonel Paterson, by Mr. David Burton, by Mr. George Caley, &c., 6; estimated number of species in the flora of [in 1814], 7 [in 1849], 338; proportion of some of the larger orders in the vegetation of, 62; a large proportion of the genera and species of phænogamous plants peculiar to, 63; comparison of its vegetation with that of other parts of the world, South Africa, 63; South America, 64; New Zealand, 65; Europe, 65; list of species common to Terra Australis and Europe, 65, 68; the portion of the coast extending from Swan River on the W. Coast, to Middle Island on the S. Coast, contains the greatest proportion of genera peculiar to New Holland, 309, 338; vegetation of the extratropical interior, 338; number of plants collected in the various expeditions to the interior, 339

Testa, how formed and distinguished, 449, 450; sometimes completely obliterated, 450; forms the greater part of the substance of the seed in certain Liliaceæ, 450; its singular development in the ripe fruits of Banksia and Dryandra, ibid.

Thoa, generically the same as Gnetum, 153

Thonningia sanguinea, related to, if really distinct from, Balanophora, 414 note.

Tiliaceæ, observations on the order and on the species found in the vicinity of the Congo, 108

Tillandsia usneoides, peculiarities of its vascular system, 413 note.

Tobacco of the banks of the Congo, probably brought from America, 155; arguments in favour of its American origin, 158

Tradescantia Virginica, cell-nucleus in its various tissues, 513-14; structure of the hairs of its filaments, 513-14; striæ on, 513 note; nucleus in, ibid. note; circulation in, ibid.; development of its pollen, 514 note; circulation in its pollen tubes, 530 note.

Transportation of plants to distant localities, purposely, 167; accidentally, 167; by natural causes, 168; favoured by the degree of development and protection of the embryo, 168

Tremandreæ, character of the order, and observations on its distribution in Terra Australis, 15

Treviranus, L. C, his account of the structure of the pollen masses, and of the mode of impregnation of Asclepiadeæ, 520-1

Tribulus, subdivision of the genus, 318

Triplosporite, some account of, 583—591; history of the specimen described, 583; description of the specimen, 585-8; its axis, bracteæ, sporangia, and sporules, 586-7; its analogy with Ferns and Lycopodiaceæ, 587; its microscopical structure, 587; its affinities, 688; its probable generic identity with Lepidostrobus; account of a fossil specimen closely resembling it, 590