Dr. Arnott on the Genus Rhizophora. 361 



but one or two additional, specimens of all of which I have 

 since received from him. I shall therefore here endeavour to 

 give a synopsis of the genera and species of the whole group. 



I. Rhizophora, Lam., Kunth, Blume, TV. §■ A. 



Calyx 4-fidus ; lacinise tubo 2 — 3-plo longiores. Petala 4 lanceolata 

 acuminata apice nuda. Stamina 8 — 11, quorum 4 petalis opposita : 

 filamenta brevissima : anthera? magnse, subsessiles, basi affixa?, conni- 

 vcntes, oblongo-lineares, acuminata?, brcviter cuspidatse. Ovarium se- 

 miadhserens, biloculare, 4-ovulatum, parte libera ovata carnosa solida, 

 sensim in stylum conicum brevem acuminata. Fructus subovatus, basi 

 calycis laciniis recurvis coronatus, tubo longior. 



Pedunculi 2 — 3-Jidi vel dichotomi ; calyx bractea cupulata svjfultus. 

 Flores magni: alabastra ovoidea, Icevia. 



§ 1. Stamina 8. Petala concava, coriacea, stamen unicum antepositum 

 foventia, versus margines induplicatos villosa. Pedunculi ex axillis 

 foliorum hornotinorum orti, petiolis sublongiores, 2 — 3-fidi vel dicho- 

 tomi : flores plus minusve pedicellati. 



1. R. Mangle (Linn.) ; foliis obovato-oblongis, obtusis. — ot, pedunculis 

 2 — 3-floris, floribus sublonge pedicellatis, calycis laciniis triangulari-ob- 

 longis. — R. Mangle, Linn. Sp. P. G34 (ex parte); DC. Prod. III. p. 

 32 ; Vclloz. Fl. Flum. v. t. 1. — /3? pedunculis dichotomis. — R, racemosa, 

 Meyer prim. Esseq. p. 185. DC. I. c. 



Hob. in America, et ? Africa? oris occidentalibus. 



I refer to the African locality with great doubt, not having 

 myself seen any specimens from that country. Brown, in his 

 appendix to Capt. Tuckey's narrative of the expedition to the 

 river Congo, at p. 43 7, says: "Of Rhizophorece, as I have 

 formerly proposed to limit it, namely to Rhizophora, Brugui- 

 eria, and Carallia, the collection contains only one plant, 

 which is a species of Rhizophora, the mangrove of the lower 

 part of the river, and probably of the whole line of coast, but 

 very different both from that of America, and from those ei- 

 ther of India or of other equinoctial countries that have been 

 described." From which we learn two things, that Dr. Brown 

 considers that there is only one American species ; and se- 

 condly, that the west African one is perfectly distinct from 

 it. On the other hand, Guillemin and Perottet say of the 

 African plant (FL Senegamb. i. p. 291): "C'est bien la meme 

 espece que celle qui croit si abondamment aux Antilles, au 

 Mexique, a la Louisiane, et au Bresil." It is to be regretted 

 that neither of these botanists have given a complete descrip- 



