Even in the absence of pollinating agents, seed-setting is assured in:

Commelina produces two types of flowers: chasmogamous (open) and cleistogamous (closed). Cleistogamous flowers never open, and anthers and stigma lie close to each other. When anthers dehisce in the flower buds, pollen grains come in contact with the stigma, ensuring self-pollination and seed-setting even without external pollinators.