Annual shrubs, 25–40 cm high and 30–40 cm wide, or climbing in other vegetation and up to 2 m high. Leaves with 1 pair of leaflets; petiole flattened, 3–8 (–12) mm long, similar width to leaflets; leaflets succulent, narrowly oblong, 4.5–12 (–25) mm long, 0.9–1.5 (–2) mm wide, continuous with petiole, acute. Pedicel 2.5–3.5 (–7) mm long in flower, erect. Sepals 4, 3–4.5 mm long, often purple. Petals 4, obovate, usually distinctly clawed, 3.3–5 (–6.2) mm long, longer than sepals, yellow drying white. Stamens 8; filaments 2.2–2.5 (–3.7) mm long, gradually dilated to base, not winged, without appendages. Disc 4-lobed; lobes free, semicircular, succulent, papillose on margin. Ovary 4-angled, 4-celled, glabrous; stigma usually distinctly 4-lobed, rarely entire. Fruit pendent, 4-winged, 4-celled, not breaking into single winged fruitlets, ±circular to transversely elliptic, 11–15 mm long, 7.5–22 mm broad, rounded or truncate with shallowly emarginate apex; wings with widely spaced reticulate venation; pedicel 3.5–7 (–9.5) mm long in fruit; fruiting style 0.6–1 (–1.8) mm long. Seeds 0 or 1 per cell (1 (2) per fruit), mostly immature, c. 5 mm long, pale brown with hygroscopic hairs all over.
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