Herbs to 30 cm tall, perennial. Stems trailing or scrambling to decumbent, sometimes elongate, scabrous or pubescent. Leaves usually 4 per pseudo-whorl of 2 unequal pairs; petiole ca. 2 mm, puberulent; leaf blade elliptic to obovate-lanceolate, 2.5-5 × 1-2 cm, puberulent, secondary veins 3-5 on each side of midvein, base cuneate, margin undulate or dentate, apex acute. Flowers axillary and solitary or in clusters of few-flowered spikes; bracts paired, broadly spatulate to obovate-oblong, 4-13 × 2-6 mm, unequal with inner pairs larger than outer ones, strongly 3-veined, margin bristly ciliate. Calyx puberulent, unequally lobed; posterior and anterior lobes oblong, 1.2-1.8 × 0.4-0.6 cm, 3-veined, apex of anterior lobe often 2-cleft; lateral lobes linear-lanceolate, 9-12 × 2-3 mm, margin ciliate. Corolla whitish, often with pink or purple; lip obovate, 1.6-1.7 × ca. 0.8 cm, spreading; lobes ovate-oblong. Staminal filaments ca. 5 mm. Style ca. 1.2 cm. Capsule ellipsoid, ca. 8 mm, glabrous. Seeds ca. 3 × 2 mm. Fl. Dec. 2n = 16, 22, 24, 26, 28, 30.
A wiry herb. It grows each year from seeds. It lies along the ground. Stems form roots at the nodes. The leaves are in 2 unequal pairs almost forming a ring. The leaves are narrowly oval and 3-5 cm long by 1-2 cm wide. The flowers are in clusters in the axils of leaves. They are white with pink or purple. The fruit is a capsule. It contains 2 seeds.
Prostrate to erect perennial herb. Leaves entire or rarely toothed, scabrid, pubescent or subglabrous. Bracts sometimes with black venation. Calyx wholly included in spike or upper segment shortly exserted. Flowers white.
White flowers 1/2 in. long in short finely-spiny spikes
Suffrutescent herb, usually procumbent,
Coarsely pubescent on the young parts
Whorled leaves