Greek a — without, rachos — branches.
Mostly annual herbs with spreading stems. Leaves alternate, odd-pinnate; stipules united to the bases of the petioles. Flowers in axillary spikes, yellow. Stamens united into a tube. Fruit with a netted surface, remaining closed and ripening underground; seeds 1-3.
Grown both commercially and ornamentally as a novelty in warm regions.
22 species from S America.
Leaflets 4; pods constricted and developing underground.
Source: (2002). Fabaceae. In: . Horticultural Flora of South-eastern Australia. Volume 3. Flowering plants. Dicotyledons. Part 2. The identification of garden and cultivated plants. University of New South Wales Press.