the infallible indication of this position, the direction of the inner membrane and nucleus of the ovulum corresponds with that of its testa. But this character, in general very uniform in natural families, and which, equally existing in Cistineas, so well defines the limits of that order, as I have long since remarked *, would seem to be of less importance in Zygophyllese. M. Adrien de Jussieu, who, in his memoir already cited, admits its exist-, ence in I'agonia, and in both our species of Zygophyllum, considers it as an exception to the general structure of the latter genus, in the definition of which he retains the character of “ radicula hilo proxima.” I believe, however, that m all the species of Zygophyllum, except Fabago, which possesses, also, other distinguishing characters, this opposition of the radicle to the external liilum will be found; for in addition to the two species contained in the herbarium, in both of which it is very manifest, I have observed it in Z. coccineum, and in all the species of South Africa that I have had au opportunity of examining. In some of these species, indeed, it is much less obvious, partly from the greater breadth of the funiculus, and also from its being closely applied, or even slightly adhering, to the testa of the seed. But hence it is possible to reconcile the structure of these species with that of Fabago itself, in which the raphe seems to me to be external: and if this be really the ease, Fabago differs from those Zygophylla of South Africa alluded to, merely in the more intimate union of the funiculus with the surface of the testa. Whether this observation might be extended to the other genera of the order, I have not yet attempted to ascertain. B a l a n it e s .¿Eg y p t ia c a , though not belonging to Zygophyllese, may be here mentioned. The specimen is from Bornou, but like all the other plants of that country, has no particular place of growth indicated, nor is there any observation respecting it. For a very full and interesting history of this plant, I may refer to M. Delile’s Flore d’Egypte {p. 77. tab. 28). Of C ist in ea s, three species were observed between Tripoli and Mourzuk., The G eiiania cez e of the collection consist of four species of Erodium, all of which were found on the same journey. Of M a e v a c e .e , considered as a class, there are twelve species in the herbarium. Only two of these are particularly deserving of notice. The first, Adansonia digitata, found in Soudan, where the tree is called Kouka, is described by Captain Clapperton ; the second, Melhania Denhainii, a new and * In Hooker's Flora Scotica, p. 284. remarkable species of thé genus, differing from 'all7 the others in having its bracteæ regularly verticillatèd, and, at the sànié time, longer and much broader than the divisions of the calÿx. A single speciés "of Vrtrs is in thèhollèction,' ftomBornoij. N e u r a d a PitosTBXTA, generally referred to itosacefe, was found in Wady Ghrurbi. Ta:\jARiscrxKÆ. A species of Tamarix, apparently not different from T. gallica, is the Attil, common in Fezzan, where, according to Dr. Ouduev, it is the only shady trde. " L o r a n t i ieæ . A species of Loraiithus, parasitical oh the Acacia nilotiea, was observed very commonly from Fezzan to Bornou. L e g e m LVOS.E. Of th i s class th e h e rb a r ium c o n ta in s th i r ty - th r e e sp ecies, am o n g w h ic h th è r e a r e h a r d ly m o re th a n tw o u n d e s c r ib e d , and tlie s e b e lo u o -in " to a w e ll-e s ta b lish e d g e n u s . Of the order or tribè M im o s eæ only three species occur, namely, Acacia nilotiea, Mimosa Habbas, and I n g a Wgfohosii.oraspecies very nearly related to it. Of this last named plant, I judge merely from ripe fruits adhering to the singular club-shaped réceptacle, or axis of the spike. The specimens were collected in Soudan, and belong to a tree of considerable importance to the inhabitants of that country, by whom it is called Dotira. According to Captain Clapperton, “ The seeds are roasted as we roast coffee, then bruised, and allowed to ferment in water ; when they begin to beeoriie putrid, they are well washed and pouuded ; the powder made into cakes, somewhat in the fashion of our chocolate ; they form an excellent sauce for all kinds of food. The farinaceous matter surrounding the Seeds is made into a pleasant drink, and they also make it into a sweetmeat.” The Doura of Captain Clapperton is probably not specifically different from the Nitta mentioned by Park, in his First Journey ; nor from Inga biglobosa of the Flore d’Oware of M. de Beauvois, according to whom it is the Nety of Senegal ; and he also well remarks, that Inga biglobosa, described by Jacquin as a native of Martinico, has probably been introduced into that island by the Negroes, as he himself fbund it to have been in St. Domingo. Inga Senegalensis of M. De Candolle (Prod/-. 2. p. 442) may also belong to the same species. It is possible, however, that some of the plants here mentioned, though very nearly related to each other, and having all the same remarkable club- shaped spike, may be specifically distinct ; for it appears from specimens colh h
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