Scrophularinæ. Only six species of this family occur, none of which are unpublished.
Orobanche compacta of Viviani was observed between Fezzan and Bornou.
Of Convolvulaceæ there are five species, four of which belong to Bornou; the fifth is an aquatic Ipomœa, found creeping on the borders of a small lake near Tintuma. Possibly this plant may be Ipomœa aquatica of Forskal, and consequently Convolvulus repens of Vahl, (symb. 1, p. 17.) It is not, however, the plant so called by Linnæus, which proves, as I have elsewhere stated, (Prodr. Fl. Nov. Holl. 1, p. 483.) to be Calystegia sepium; nor does it belong to either of his synonymes. Our plant differs also from Vahl’s 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 Ipomœa Clappertoni[117].
Among the few Labiatæ, there is a species of Lavandula, possibly distinct from but very nearly related to L. multifida. It was found on the mountains of Tarhona.
Of Boragineæ, the herbarium includes eleven species, the greater part of which were collected near Tripoli, and all of them belong to well established genera.
Primulaceæ. Of this family two species of Anagallis occur in the collection, and of these A. cærulea was observed both near Tripoli and in Bornou.
Samolus Valerandi was also found near Tripoli, in Wady Sardalis in Fezzan, and in Bornou.
Of Dicotyledonous, or even of all phænogamous plants, S. valerandi is perhaps the most widely diffused. It is a very general plant in Europe, has been found in several parts of North Africa, in Dr. Oudney’s herbarium it is from Bornou, I have myself observed it at the Cape of Good Hope and in New South Wales, and it is also indigenous to North America.
The geographical distribution of the genus Samolus is equally remarkable. At present eight species are known, of which S. Valerandi is the only one indigenous to Europe, or which, indeed, has been found in the northern hemisphere, except the nearly related S. ebracteatus of Cuba. All the other species belong to the southern hemisphere, where S. Valerandi has also a very extensive range.
Of Plumbagineæ, there are three species of Statice Taxanthema; for the latter name may be preserved as belonging to a section, though hardly as that of a genus, so far at least as depends on inflorescence, which in both subdivisions of Statice is essentially similar; that of Statice Armeria being only more condensed. Of the three species in the herbarium, one appears to be unpublished.