594 



INDEX, 



in certain species of Viscum, 380-1 ; 

 deviations in the regular mode of 

 bursting, as in Dillenia and Sola- 

 nuin, in several Ericinse, in Tetra- 

 tliecn, Hamamelideae, Berberidese, 

 several Laurinse, and certain species 

 of Khizophora, 381; structure 

 altered or disguised, as in Myris- 

 tica, Cauella, and several Aroidese, 

 in Cissampelos, Conospermum, and 

 Synapbea, ibid. ; various views of 

 the structure in Rafflesia, 881-3; 

 not obviously reconcileable to any 

 hypothesis of a common type, 405 

 7iote. 



Anthers of Cycadese, 459-60. 



Authocleista, a genus related to Apo- 

 cinese, observations on, and its 

 affinities, 133 



Apex of the nucleus regarded as the 

 point of impregnation of the ovu- 

 lum, 453 ; has no organic connec- 

 tion with the parietes of the ova- 

 rium, 454 



Aphyteia, compared with Rafflesia, 

 structure of antherae in, 388, 396-7, 

 401, 461 {see Hydnora) 



Apocinese, observations on the order, 

 and on its distribution in Terra 

 Australis, 37 ; further observations 

 on the order, and on new genera 

 belonging to it, found in the vicinity 

 of the Congo, 133 ; no species in 

 the collection from Central Africa, 

 295 



Apodanthese, a tribe allied to Raffle- 

 siaceee, 411 note,^^^; its charac- 

 ters, 429 



Apodanthes, its characters, 430 



Apostasia, position of lateral stamina 

 in, 499 ; composition of stigma in, 

 503; placentae of the trilocular 

 ovarium opposite to the three outer 

 divisions of perianthium in, 560-1 



Aquilarinae, regarded either as a dis- 

 tinct familv, or as a section of 

 Chailletea3,"l26 



Arachis hypogeea, of the banks of 

 the Congo, doubtful whether in- 

 digenous or introduced, 159 ; its 

 remarkable geographical distribu- 

 tion, 159-60 ^ 



Araucaria, origin of the ovulum in, 

 458 ; analogy of male and female 

 organs in, 461 



Areola or nucleus of the cell in Or- 

 chideas, 511 — 14; in other Mono- 

 cotyledonous and Dicotyledonous 

 plants, 513 



Arillus,^ of rare occurrence, how dis- 

 tinguished, 449 



Arnold, Dr. Joseph, his account of the 

 discovery and description of the 

 gigantic flower, afterwards named 

 Rafflesia, 370—373 



Aroideae, peculiar structure of the 

 embryo in the seeds of certain, 

 365 



Artocarpeae, characters of the order, 

 and observation on the species 

 found in the vicinity of the Congo, 

 138 



Asarinae, compared with Rafflesia, 

 384-5, 389, 392 



Asclepiadeae, observations on the order, 

 and on its distribution in Terra 

 Australis, 37 ; on the species found 

 in the vicinity of the Congo, 134; 

 in Central Africa, 295 ; observa- 

 tions on the organs and mode of 

 fecundation in, 487 — 543; sup- 

 plementary observations on, 545 

 — 551 ; on the structure of the 

 pollen mass in, 522 — 525 ; the 

 pollen grains, 524; removal of 

 the pollen masses from their usual 

 place, 524; how placed in the 

 fissures formed by the alae of the 

 antherae, 525 ; their tubes, how 

 produced, 525 ; direction of the 

 cords to the apex of the style, 

 525-6 ; and as far as the commence- 

 ment of the placenta, 526; dehis- 

 cence of pollen mass uniformly on 

 the more rounded edge, 527; ap- 

 plication of pollen mass of one 

 species to the stigma of another, 

 528 : pollen tube traced to its 

 attachment at a definite point on 

 the surface of the ovula, 549 



Asclepias, structure of the pollen 

 mass in various species of, 523 



4sclepias phytolaccoides, pollen tubes 

 traced to a definite point of 

 attachment on the surface of its 

 ovula, 549 ; description of the 

 ovulum in, 549-50; changes of the 

 ovulum in, after the insertion of the 

 pollen tube, 550-1 



Asphodelens, observations on the order 



