Leobordea divaricata yellow and brown flowers

The yellow flowers of Leobordea divaricata may sometimes have some brown colouring or turn brown as they age. In picture the brown and yellow flowers appear as if they belong to different plants.

Like many plants in the Fabaceae family L. divaricata also has a symbiotic relationship with soil bacteria, forming root nodules that fix atmospheric nitrogen for the plant's use, indirectly also benefiting nearby plants. Much nitrogen is present in the atmosphere as nitrogen gas. These plants convert the nitrogen into usable form as plant nutrition. Specialised bacteria that play a role here invade the roots. Root nodules are formed from where the organisms absorb the nitrogen from air present in the soil. It is fixed into ammonium ions passed on to the root cells for serving as nutrients in forms like nitrates and nitrites. Fabaceae plants contribute in replacing fertilisers in gardening and farming (Capon, 2005; Van Wyk and Malan, 1997; iNaturalist; https://tropical.theferns.info).