ON CENTRAL-AFRICAN PLANTS. 23 
The affinity of this genus is with Gonioma, Е. Mey., from which it differs by the 
different shape of the corolla with longer lobes, and by the presence of adnate teeth 
or gibbosities within the throat, by definite ovules and seeds, and by the opposite or sub- 
opposite not verticillate leaves. 
18. DIPLORHYNCHUs pPsILopus, Welw. MS. in Herb. n. 5982. (Plate V. figs. 1-9.) 
D. ramis іп sicco brunneo-rubescentibus teretibus, ramulis foliosis, foliis oppositis 
vel rarius ultimis subsparsis suboblique ovalibus apice obtuse acuminatis retusisve 
basi plus minusve cuneatis petiolatis tenuiter coriaceis nitidis eleganter reticulatis 
1-2 pollices longis $-1 poll. latis, costa venisque leviter pellucidis, petiolo 3—1-poll. 
angustissime alato ssepe (in sicco) unilateraliter verso, cymis laxe ramosis semi- 
globosis 2-23 poll. diam., pedunculo i-$-pollicari, pedicellis minute puberulis ap- 
proximatis i-poll., braeteolis parvis, alabastris eylindraceis }-poll., floribus }-poll., 
calyce minute puberulo, corolla extus glabra, ovulis in quoque carpello 2 super- 
positis. 
Habitat in regione alto-plana ; nomen vernaculum “ Mussala Canjanga.” 
The description given above is taken from our specimens. According to a note made 
by Major Serpa Pinto the fruit is edible; but this statement does not appear to be 
probable, at least in the case of Welwitsch’s specimens; the latter appear to belong to 
the same species, though in those plants the habit is more robust, the leaves range up to 
3 inches in length by 13 inch in width, the petioles to 1 inch in length, the inflores- 
cence is less lax, and often of smaller diameter, the pedicels are more conspicuously 
puberulous and some of them are shorter, and the unopened flowers range up to 3 inch 
in length; the follicles open nearly flat, are broadly oval, retuse at the apex, 2-seeded, 
and measure li inch long by 14 inch wide; the pericarp is hard, and very thickly 
leathery, warted outside, smooth and chestnut-coloured inside ; the seeds measure 1 inch 
long by 2 inch wide. "The following is a copy of Welwitsch's manuscript notes appended 
to his number 5982 :—* Arbor parva, nunc frutex scandens, nune arbuscula stans uno 
alterove ramo scandente ; folia sempervirentia coriacea lucida ; flores albi fragrantissimi ; 
planta lactescens. Habitat (distr. Huilla) in editioribus collinis prope Nene una cum 
Combretaceis, Octobr. 1859, c. fl. et fr." 
Of the genus the other species obtained by Welwitsch in Angola is called by the 
Portuguese colonists ** Jasmineira " or * Jasmin de Cazengo." 
The principal figure in Plate V. represents the natural size of a flowering branch of 
Major Serpa Pinto's plant; the detached flower and flower-bud are enlarged to about 
four diameters; the other dissections are more considerably enlarged. 
Serpa Pinto, nos. 12 and 13. 
CONVOLVULACEZ. 
19. ІромтА ANGUSTIFOLIA, Jacq. Collect. ii. 367 (1788), et Ic. Pl. Rar. ii. t. 317 (1786- 
1793); non Choisy. Ipomea filicaulis, Blume, Bijdr. Fl. Ned. Ind. p. 721 (1825); 
Choisy in DC. Prodr. ix. p. 353, n. 31 (1845), cum syn.; Benth. in Hook. Niger Fl. 
p. 466 (1849). 
