Annual herb, erect, to 61 cm high. Stem scapiform or rarely scapose; foliose part hispidulous; bracteate part glabrescent or glabrous. Leaves with upper two pairs usually whorled, elliptic or ovate, 10–25 mm long, 3–9 mm wide, hispidulous. Flowers in widely spreading terminal and axillary compound umbellate clusters; pedicels to 45 mm long. Calyx campanulate, glabrous, subglaucous; tube 0.6–1 mm long; lobes 0.5–1 mm long. Corolla white; tube 1.5–3.5 mm long; lobes 0.5–1 mm long. Stamens 1–3 mm long; anthers strongly apiculate; dehiscence extrorse. Capsule ellipsoidal, 2–3 mm long, subglaucous; fruiting style 0.5–1 mm long.
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