I. B. Pole Evans, The flowering plants of South Africa… (1924)
“ The flowers are protandrous and the anthers all converge to a point. The base of the anther is provided with a pouch and the filament with a ciliated hood, and these two structures form a cage for the pollen. The stigma lies within this cage, and the style may possibly elongate eventually, and thus push the pollen above the anthers, as in the Compositae. The plant flowered freely in Pretoria, but failed to fruit, and from this it may be assumed that self-pollination does not take place. ”
