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Erect annual herb 7–35(–60) cm tall, stem 1–2(–5) mm diameter at base, generally with 3–4 subequal ascending branches from the lower half; branches densely invested in a mixture of non-glandular simple crinkled and glandular simple hairs, sometimes scattered with longer simple hairs. Leaf-blade narrowly elliptic or lanceolate, 1.7–2.6(–3.6)≈0.6–1(–1.8) cm, apex acute, margin with 6–7(–14) teeth on each margin, base rounded, 3–4 nerves on each side of the midrib, upper surface with thinly scattered simple glandular and non-glandular hairs, lower surface with sessile glandular hairs and thinly scattered stellate hairs, sometimes admixed with appressed simple hairs; petiole 0.5–0.8(–1.1) cm long, indumentum as stem; stipules subulate to lanceolate, 1.2–1.5(–3.5)≈0.3(–1) mm. Inflorescence with flowers single in the upper axils; peduncle (8–)10–20 mm long, ebracteate, densely glandular-hairy; pedicel thicker than and inconspicuously articulated with the peduncle, 1–2 mm long. Flowers pendulous, red, mauve, pink or, rarely, orange, 6–8 mm wide. Calyx campanulate, 5–7≈5–8 mm, lobed for 1/3, lobes widely triangular, 2–3≈1–2 mm, apex acuminate, 0.5–1 mm long, densely glandular-hairy. Petals oblanceolate to obovate, 7–8≈3–5 mm, margin involute in the lower half, glabrous. Stamens with filaments oblanceolate, 3–4≈1.2–1.3 mm, with simple hairs on the distal margin; anthers blue, 3.7–5≈0.5–1 mm. Ovary truncate-ovoid, slightly awned, 1.2–2≈0.7–1.4 mm, stipe 0.5–2 mm long; styles 3.5 mm long, puberulous. Fruit capsule truncate-ovoid, awned, 4–6(–7)≈6–7(–8) mm; awns widely triangular, subpatent, shortly glandular-hairy; seeds subreniform, 1–1.3≈0.8–1≈1 mm, widest at chalazal end, rugose, minutely papillate, dark brown.