Roepera compressa

Erect or ascending annual herb to c. 25 cm high. Leaves mostly 15–45 mm long, glaucous; leaflets continuous with petiole, ovate to suborbicular, uppermost oblong, mostly 8–25 mm long, 2–15 mm wide, appressed to each other by their upper surfaces, apex acute to rounded. Sepals 4, ovate-lanceolate, 1.5–3 mm long, deflexed in fruit; petals 4, obovate, 3–6 mm long, apex rounded, yellow; stamens 8, filaments winged in lower part. Fruiting pedicels 4–8 mm long; fruit a 4-angled loculicidal capsule, obovoid, 7–10 mm long, drooping, rounded at apex with a short point; seeds 2–4 per cell. Flowers mostly Apr.–Nov.