84 XC. CONVOLVULACEE (BAKER AND RENDLE). | Prevostea. 
Lower Guinea. Lower Congo: Mayombe, Cabra, 88, 92. 
I have not seen this species, but from the description it is evidently very closely 
allied to P. Heudelotii, scarcely differing, except in the somewhat larger sepals, 
unless we accept the measurement given for the bracts.—A. B. R. 
Imperfecily known species. 
6. P. Poggei, Dammer ex Hallier f. in Mém. Soc. Bot. Belg. xxxvii. 
pl. 1. 88 (name only). 
South Central. Congo Free State: Lunda; Mukenge, Pogge, 1172, 1090. 
12. DIPTEROPELTIS, Hallier f. in Jahrb. Hamb, Wiss. Anstalt. xvi. 
Beiheft. 3, 4, cum tab., and in Engl. Jahrb. xxviii. 28. 
Sepals 5, free, imbricate, unequal, the two outer ovate, longer and 
broader than the three inner, very accrescent, and finally orbicular- 
reniform, looking like a wing to the capsule. Corolla much larger than 
the calyx, campanulate, deeply 5-fid. Stamens inserted low down in 
the corolla ; filaments filiform; anthers oblong. Disc small, cupular. 
Ovary conical, 1-celled, 2-ovuled; style deeply bifid ; stigmas linear- 
oblong. Capsule small, ovoid-conical, splitting from the base into 
linear scales.—A climbing shrub with elliptic-obovate, weakly acuminate 
leaves, with entire to emarginate base. Flowers small in terminal or 
axillary narrow panicles, bearing remote, solitary or paired cincinnous 
cymes ; bracts and bracteoles minute, linear. 
Endemic, monotypic, 
1. D. poranoides, Hallier f., ll. cc. 5, 29. A climbing shrub. 
Leaves elliptic-obovate, 24-4 in. long by half as broad, generally more 
or less acuminate, weakly mucronate, base rounded to emarginate, 
glabrescent on the upper surface, sparsely shortly hairy beneath, 
especially on the veins; lateral veins 6-7 on each side of the midrib, 
joining in intramarginal arches. Panicles axillary, long-peduncled, 
above a foot long, laxly many-flowered ; bracts minute, linear. Outer 
sepals 1} lin. long and broad, reaching 14 in. long by 14 broad in the 
fruit. Corolla small, white; lobes 4 lin. long by 3 lin. broad, 
ferrugineo-tomentose outside. Capsule 3 lin. long. 
Upper Guinea. Cameroons: Lolodorf, 2000-2500 ft., Staudt, 287; Zenker, 
1383 ! Bipinde, Zenker, 1781! 
13. PORANA, Burm.; Benth. et Hook. f, Gen. Pl. ii. 876. 
Sepals subequal, oblong, very accrescent, finally rigid and spreading. 
Corolla campanulate or funnel-shaped; limb plicate, subentire or 
shortly lobed. Stamens included or slightly exserted ; filaments linear 
or filiform. Pollen unarmed, ellipsoid with 3 longitudinal folds. Disc 
annular or absent. Ovary 2-celled, 2- or 4-ovuled ; style long or short, 
