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Rh Reseda, the capsules of the genus open at top at a very early period, 363

Resedaceæ, observations on the order, its structure, and affinities, 281—285; species found in Central Africa, 281; comparison with Capparideæ and Cruciferæ, 282; Mr. Lindley's hypothesis regarding, controverted, 283; structure of petals in, 281, 283-4; development of flower-bud of Reseda odorata, 284

Restiaceæ, observations on the order and on its distribution in Terra Australis, 53; hardly exists in the interior, 339

Resupination of corolla in Westringia controverted, 39; seed in Cremolobus and Menonvillea, 264; of ovules in Euonymus and Abelia, 448-9

Rhamneæ, character of the order, and observations on its distribution in Terra Australis, 26

Rhizantheæ, objections to the union of Rafflesiaceæ and Balanophoreæ in the same class, 412—415; Mr. Griffith's memoir on the plants referred to, 423

Rhizophoreæ, character of the order and observations on its distribution in Terra Australis, 20; on the species found in the vicinity of the Congo, and on the characters of the order, 119

Richard, M. Achille, his idea of the structure of an Orchideous flower, 501, 561

Ritchie, Mr., plants collected by him near Tripoli, &c., 260

Ross, James, plants collected by him in Melville Island, 185

Ross, Captain John, plants collected by the officers of his voyage on the coasts of Baffin's Bay, &c., 175

Roupellia grata, a species of cream fruit used by the natives of the west coast of Africa, 153

Rubiaceæ, forms with Apocineæ, Asclepiadeæ and certain genera referred to Gentianeæ, a great natural class, 36; observations on the order and on its distribution in Terra Australis, 36; on the division of the order, and on the species found in the vicinity of the Congo, 130-2; proportions of the order and of its principal divisions in various countries, 130—1; new genera of, found in the vicinitv of the Congo, ibid.; species found in Central Africa, 295

Ryania referred to Passifloreæ, 121; its affinity to Smeathmannia, 387 note

Sabine, Captain Edward, plants collected by him in Melville Island, 185, 227

Safu of the banks of the Congo, a valuable fruit of the order Amyrideæ, 160

Salisburia, analogy of male and female organs in, 460

Salix oleifolia, monstrosities in, illustrating the origin of ovula, 563

Salt, Henry, new and rare plants collected by, in Abyssinia, 91; relation of plants collected by him to the vegetation of the west coast of Africa, 162

Samolus Valerandi, perhaps the most widely diffused of Phænogamous plants, 297; geographical distribution of the genus, ibid.

Santalaceæ, observations on the order and on its distribution in Terra Australis, 42; its affinity to Olacinaæ, 137

Sapindaceæ, observations on the order and on the species found in the vicinity of the Congo, 107

Sapoteæ, only one species in the collection from Central Africa, 295; the woody shell of the nuts really formed of the testa, 296

Sapria, a genus of Rafflesiaceæ, 423; its characters, 426

Sargassuni bacciferum, regarded by Meyen as specifically identical with Sargassum natans, or vulgare, 580

Sargassum natans found lixed by a discoid base, or root, 580

Saururus, explanation of the structure of its seeds, 452

Savignya, on the structure and characters of the genus, and its affinities in the order Cruciferæ 262, 265

Schleiden, M., his theory of impregnation, 574; his observation of the