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Rh Hooker, Dr. Joseph Dalton, his discovery of sporules in Lepidostrobus, 588; his essay on Lepidostrobus, 589, 590

Horsfield, Dr. Samuel, drawings and specimens of Rafflesia Arnoldi, brought to England by, 373; account of a figure of a second species of Rafflesia observed by him in Java, 388-9

Hove, Mr., plants collected by him in the vicinity of Cape Coast, 152

Hoya carnosa, dehiscence of its pollen mass, 527; rupture of the mass and production of pollen tubes, 529, 530; circulation in its pollen-tubes, 530 note

Hydnora compared with Rafflesia, 388, 396-7, 401—410; structure of its ovarium, 404; ovula, 407; seeds and embryo, 409, 410; its characters, 427

Hydnora Africana, description of, 416–19; H. Americana, characters of, H. triceps, characters of, ibid.

Hydnoreæ, a tribe of Rafflesiaceæ, 411; its characters, 427

Hydroleæ, foundation of the order and its affinities, 135

Hydropeltideæ, a section of Nymphæaceæ, arrangement of ovula in, 556

Hymenanthera, a genus intermediate between Violeæ and Polygaleæ, 125

Hypælyptum, a corruption of the name Hypælytrum, 144

Hypælytrum, observations on the structure of the genus, 144-5

Hypoxideæ, characters of the order and observations on its distribution in Terra Australis, 51

Hypoxis fascicularis, a species of Colchicum of the section Monocaryum, 298—300

Impregnation, difficulties regarding the point of, in the ovulum, 453; mode of, in Orchideæ, 506—510; artificial impregnation in, 538; in Asclepiadeæ, 528-9

Insects, frequency and necessity of their aid in the impregnation of Orchideæ and Asclepiadeæ, 531; a single insect capable of impregnating many flowers, 538; insect-forms of flowers in Ophrys intended to deter and not to attract insects, 538

Irideæ, the double stigmata of several, 559; their relation to the cells of the ovarium in 559, 560

Jack, William, letter to Mr. Brown on the gigantic flower, afterwards called Rafflesia, 394

Junceæ, observations on the order, and on its distribution in Terra Australis, 52, 439; observations on Kingia, Dasypogon, Calectasia, and Xerotes, as referrible to the order, 439

King, Philip Parker, plants collected during his voyages round the coasts of New Holland, 338

Kingia, a plant of very similiar habit to Xanthorrhœa, 51, 435

Kingia, characters and description of the genus, 433—439; observations on its ovulum, 439, 447

Koniga, characters of the genus, with observations on its affinities and on the structure of its septum, 266, 268

Labiatæ form with Verbenaceæ, a natural class, 38, 135

Labiatæ, observations on the order, and on its distribution in Terra Australis, 38; on the species found in the vicinity of the Congo, 135; in Central Africa, 297

Lardizubaleæ, arrangement of ovula in the carpels of, 379 note, 555

Lasianthera, too imperfectly known lo determine its place, 151

Laurinæ, with the exception of Cassytha, supposed to be unknown on the continent of Africa, 150

Leea and Aquilicia, only different names for the same genus, 151; nearly related, if not absolutely belonging, to Viniferæ, ibid.

Legnotis, its characters and affinity, 119

Leguminosæ, a natural class divisible into at least three orders, 22; number of species published, and of species found in Terra Australis, 22; of species found in the vicinity