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 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 Only six species of this family occur, none of which are unpublished.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.

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