296 OBSEHYATIONS ON PLANETS 



Banlvsian herbarium, I have httle doubt that they both 

 belong to one and the same species. Whether this plant 

 is really a Bassia, is not equally certain ; and the seed at 

 least agrees better with Yitellaria paradoxa of the younger 

 Gaertner {Carjwh tab. 205) than with that of Bassia figm^ed 

 by his father {ch Fruct. et Sevi. PL tab. 104). 



That the w^oody shell in the nuts of all Sapotese is really 

 formed of the testa or outer membrane of the seed, as I 

 have elsewhere stated^ and not of a portion of the substance 

 of the pericarpiam, according to the late M. Richard and 

 the younger Gaertner, is proved, not only by the aperture or 

 micropyle being still visible on its surface, as M. Turpin 

 has already shown in one case [Ann. du Mus. cV Hist. Nat. 

 7, tab. 11,/. 3) ; but also by the course and termination 

 of the raphe, as exhibited in the younger Gsertner's 

 figures of Calvaria and Sideroxylum [Carjjol, tabb. 200, 

 201, et 202), and by the origin and ramification of the 

 internal vessels. 



240] SciioPHULARiN^. Only six species of this family 

 occur, none of which are unpublished. 



Orobanche compacta of Viviani was observed between 

 Fezzan and Bornou. 



Of CoNVOLVULACEJi: there are five species, four of which 

 belong to Bornoa ; the fifth is an aquatic Ipomoea, found 

 creeping on the borders of a small lake near Tintuma. 

 Possibly this plant may be Ipomoea aquatica of Forskal, 

 and consequently Convolvulus repens of Vahl {s?/mb. \, p. 

 17). It is not, however, the plant so called by Linnaeus, 

 which proves, as I have elsewdiere stated {Proclr. Ft. Nov. 

 Holl. 1, 2^' 483) to be Calystegia sepium ; nor does it 

 belong to either of his synonymes. Our plant differs 

 also from YahPs description of his Convolvulus repens, 

 in having constantly single-flowered peduncleS; and leaves 

 whose posterior lobes are rather acute than obtuse, and are 

 quite entire. It is probably, therefore, distinct ; and I have 

 named it Ipomoea Clappertoni.^ 



^ Prod. Flor. Kov. IIoll. I, p. o2S. 



- Ipomcea Clappertoni, glaberrima repens, folils sagittatis: lobis posticis 

 acutiusculis integerrimis, pedunculis unifloris. 



