Morphology of S. terminale Forssk. across continental Africa. All coordinates are decimal degrees. A Bud length/width ratio plotted against longitude B Length of lowermost inflorescence branch against longitude. Red points represent plants with fused (connate anthers), green points plants with free anthers; black points represent plants with no open flowers whose bud and anther characters were not measured. For details of character choice see Materials and Methods and discussion of S. terminale.