Richards 15558 had been determined as the W African submontane species S. staudtii (Engl.) Mildbr. to which it shows much resemblance but I have seen no fruits of S. staudtii. S. masukuense is much the older name. The problem of the relationship of S. masukuense and its small-leaved sometimes dwarf subsp. pachyphyllum F. White to S. micklethwaitii Verdc. and its small-leaved subspecies is one I have not attempted to clear up in this flora. The obvious solution is to combine them and have all as subsp. of S. masukuense. Really the only difference is the spectrum of leaf-shape – in S. masukuense the leaves are narrower with distinctly acuminate apices whereas in S. micklethwaitii they are broader, more rounded, with rounded apices. The type of subsp. pachyphyllum had originally been determined as S. sclerophyllum Brenan (now in synonomy of S. micklethwaitii subsp. micklethwaitii ); it is curiously variable in habit from a small shrub 0.9 m tall to a tree 12–20 m tall. Without much more field work I have hesitated to sink the two taxa, particularly as other montane taxa are probably involved. F. White (F.Z. 4: 197 (1978)) commented on the problem and gave reasons for considering subsp. pachyphyllum distinct from S. sclerophyllum. Drummond & Hemsley 1985 (Morogoro District, S Ngurus, Ruhamba Peak, 2 Apr. 1953, in Allanblackia, Podocarpus, Ocotea forest) could equally be placed in either S. micklethwaitii or S. masukuense. D.G.B. Leakey in F.D. 3330 (Kenya, Laikipia), a tree to 15 m with young shoots markedly quadrangular, leaves oblong, 11.5 x 5 cm, distinctly acuminate at apex, rounded at base, drying brown, petiole 7 mm and young fruits elongate had been named S. masukuense by Amshoff – it is probably a hybrid of S. guineense with S. cordatum .