Xysmalobium involucratum boat-shaped corolla lobes

The dull yellow green bulges of the Xysmalobium involucratum corona lobes coincide with the gaps between the flexed back, white corolla lobes, positioned below them. The corona lobes reach about halfway up the staminal column. The corolla lobes are positioned well out of the way of pollination activities to occur at or near the white flower tops. These corolla lobes have short, sunken central dips in their concave upper surfaces that show as slight keels on the outside. 

The five stamens fused to the styles in the gynostegium form the centre of the flower tops. The anthers are erect, rhomboid in shape with small, elliptic to egg-shaped anther appendages inflexed over the tip of the style. The wings of the anther appendages are broadly triangular, prominent and notched in the middle. A style tip is five-angled (Pooley, 1998; iNaturalist; iSpot; JSTOR; https://pza.sanbi.org).