PLATE 86.--Fig. 1, bract; Fig. 2, bud; Fig. 3, mature flower; Fig. 4, upper part of perianth laid open; Fig. 5, stamen; Fig. 6, pistil; Fig. 7, cross-section of leaf. N.B.--In the coloured drawing the leaves are half natural size, but the inflorescence is natural size. F.P.S.A., 1923. [Illustration: _87._ S Gower del.] PLATE 87. CERATOTHECA TRILOBA. _Bechuanaland_, _Cape Province_, _Natal_, _Transvaal_. PEDALLACEAE. Tribe SESAMEAE. CERATOTHECA, _Endl._; _Benth. et Hook. f. Gen. Plant._ vol. ii. p. 1059. =Ceratotheca triloba=, _E. Mey. ex Bernh. in Linnaea_, vol. xvi. 29; _Fl. Cap._ vol. iv. sect. ii. p. 462. The genus _Ceratotheca_, of which there are five species known, is confined to Africa, but the species figured in the accompanying plate is the only one recorded in South Africa. The genus is closely related to _Sesamum_, only differing by the capsule having two divergent horns or spines at the apex instead of being acute or beaked as in the latter genus. The species was first described in 1842 under the name _Sporledera triloba_, but, as pointed out in the _Botanical Magazine_ under Tab. 6974, there is no justification for establishing a genus to include this species separate from _Ceratotheca_. The oldest record from South Africa appears to be specimens collected by Drège between the Umtata and St. John’s River, but since then it has been found by numerous collectors. When fresh, the leaves have a very objectionable odour. The plant is very common during January on the hills at Wonderboom, near Pretoria. Our specimen was collected by Dr. R. Reitz. Specimens are preserved in the National Herbarium, Pretoria (No. 1605).