Erect annual 15–60 cm. tall; stems simple or moderately branched, particularly in the lower half, slender, pale green or reddish, finely pubescent to glabrous.. Leaves spirally arranged, though the lowermost usually opposite; petiole 1–6.5 cm. long, with several scattered stipitate glands on either side, each 1–1.5 mm. long; lamina ovate to ovate-lanceolate, 2–9.8 cm. long, 1.4–5.8 cm. broad, cuneate from a broad base, the apex subobtuse or somewhat acuminate, finely pubescent above and beneath, especially on the midrib and lateral veins beneath; lateral veins 5–6 pairs, rather oblique; margin shallowly crenate or crenate-serrate.. Flowers in axillary fascicles of 2–4, sometimes solitary, epedunculate, white or pale pink, the lower sepal with transverse pink or purplish markings.. Bracts linear, 1–2 mm. long, inconspicuous.. Pedicels 8–14 mm. long, slender, slightly pubescent or glabrous.. Lateral sepals linear-lanceolate, 1.5–2 mm. long, glabrous.. Lower sepal shallowly navicular 5–6.5 mm. long, 2–3 mm. deep, abruptly constricted into a short, 1–1.5 mm. long, straight spur which is somewhat constricted near the tip, finely pubescent or glabrous.. Dorsal petal cucullate, 4.5–5.5 mm. long, 2.5–3.5 mm. broad (unflattened), glabrous.. Lateral united petals 8–10 mm. long; upper petal of each pair ovate-triangular, 2–3 mm. long, 0.75–1.25 mm. broad; lower petal suborbicular or transversely semi-ovate, 5–6 mm. long, 4–5 mm. broad.. Fruit narrowly fusiform, 7–10 mm. long, finely pubescent.. Fig. 3/52, p. 6.
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