Sepals unequal, ovate, 3·5–5 mm. × 2–5 mm., glabrous accrescent; inner ones wider, with hyaline membranous edge; outer ones verrucose-echinate.
Flowers axillary, solitary or geminate; bracts lanceolate, 2·5 mm. long, glabrous; pedicels 0·8–4 cm., long, slender, glabrous.
Stems several, erect or decumbent, from a woody rootstock, rooting at the nodes, slender, glabrous.
Seeds trigonous, black, densely griseo-pubescent.
Corolla funnel-shaped, yellow, 8 mm. long.
Capsule globose, glabrous.
Annual herb.