Fig. 8.

Trends in the evolution of stamen types in African representatives of Salvia s.s. (Clade I). Proceeding from the ancestral stamen type A, the hypothetical stamen evolution is illustrated. Stamen of S. whitehousei modified after Whitehouse (1949), S. interrupta modified after Rosúa and Blanca (1986), schemata of all other stamens modified after Hedge (1974); filament (medium grey); connective (light grey); theca (dark grey); stamen types (in circles; ± A = reduced type A); and clades (I-A to I-D) represented by the species are given above the branches; scale bar = 5 mm.