602 



INDEX. 



of the Congo, 1]0; proportion of, 

 to Phsenogamous plants, 110; spe- 

 cies found in Central Africa, 288 ; 

 characters distinguishing Legumi- 

 nosaB from Rosacese and Polygaleai, 

 291-2 ; relation of pistillum to caljx 

 and axis of spike, 292—294 



Lemna, ovulum of, in what respect 

 differing from the usual structure, 

 448 



Leontice thalictroides, its supposed 

 fruit a naked seed, which had burst 

 its pericarpium in a very early 

 stage, 361 



Lepidodendron, affinity of Triplo- 

 sporite to, 588 



Lepidostrobus, its analogy with Triplo- 

 sporite, 583, and probable generic 

 identity with, 589-90 



Leptostomum, character of the genus, 

 and observations on its structure 

 and atfinities, 352 — 355 



Liliace^, peculiarity in the winged 

 seeds of certain, 449 



Liliaceous plants, bulb-like seeds of 

 certain, their structure and economy, 

 361-2 



Lime of the banks of the Congo, 

 probably of Asiatic origin, 156 



Lindley,Dr. John, his hypothesis of the 

 structure of Reseda, 283-4; his 

 idea of impregnation in Orchidese, 

 495 ; and of the structure of the 

 ovarium in Orchidese and Oroban- 

 chese, 557—562 



Lobelia, divisible perhaps into several 

 genera, 33 



Lobeliaceae, proposed as a separate 

 order, 33 



Lockhart, David, plants collected by 

 him on the banks of the Congo, 99, 

 173 



Loganieee, an order or section inter- 

 mediate to Rubiacese and Apocineae; 

 observations on the order and on 

 its distribution in Terra Australis, 

 37; further observations on the 

 order and on the genera composing 

 it, 132; its only combining cha- 

 racter, perhaps not more than of 

 generic importance, 132 



Lolium perenue, supposed molecular 

 motion in the grains of pollen, pos- 

 sibly a circulation of the granules, 

 530 note 



Lomentacese, observations on the 



order and on its natural distribution 



in Terra Australis, 23 

 Loranthus and Viscum form a distinct 



family, 129 

 Lunaria Libyca, constitutes with Alys- 



sum maritimum a genus to be called 



Koniga, 265 

 Lycopodiacese, affinity of Triplosporite 



to, 588 



Mairua rigida, characters and descrip- 

 tion, with observations on its struc- 

 ture and affinities, 280-1 and tiote 



Magnoliacese, form a natural class, 

 with Dilleniacese, 13 ; not found in 

 Africa, 151 



Maize, brought from America to the 

 banks of the Congo, 155 



Malpighiacege, observations on the 

 order, and on the species found in 

 the vicinity of the Congo, 105 



Manioc brouglit from America to the 

 banks of the Congo, 155 



Malvaceae, a natural class, including 

 Malvacese, Juss. ; Sterculiacea?, 

 Yent. ; Chlenacese, Du Petit Th. ; 

 Tiliaceee, Juss. ; and Buttneriacese, 

 R. Br., 11 ; HermanniaceEe added, 

 109 ; observations on the class, 

 1 09 ; species found in Central Africa, 

 288 



Malvaceae, observations on the order, 

 and on its distribution in Terra 

 Australis, 11 ; on the species found 

 in the vicinity of the Congo, 109 



Mangroves, enlargement of the em- 

 bryo, and its consequences, in various 

 species of true and spurious, 363-4 



Marantese, structure of flower in, 49 



Melanthacese, observations on the 

 order and on the species in the col- 

 lection from Central Africa, 298 



Melastomacege, observations on the 

 order, and on the species found in 

 the vicinity of the Congo, 117 ; 

 partial coiiesion of ovarium in several 

 genera of the order, and peculiar 

 function of the tubular interstices 

 for the lodgment of the inflected 

 antherae, 117; limits, structure, 

 and generic division of the order, 

 118 ; Memecylon and Petaioma 

 both belong to it, 118 



Melville Island, list of plants collected 



