Glabrous perennial 15–60 cm. tall, forming patches by means of rather thin underground rhizomes; stems erect, usually simple, rooting at the lower nodes.. Leaves spirally arranged, dark green above, pale green beneath; petiole 1.8–4.9 cm. long, often with several ± 1 mm. long fimbriae at the top; lamina elliptical to elliptic-oblong or ovate-elliptic, 3.8–15 cm. long, 1.8–4.9 cm. broad, the base ± cuneate, occasionally subrounded, the apex acuminate, often apiculate; lateral veins 7–10 pairs; margin crenate-dentate, the teeth often rather coarse, 5–12 mm. apart.. Flowers solitary or paired, epedunculate, rose or rose-purple with a whitish spur and whitish pollen.. Bracts subulate, 2–3 mm. long, inconspicuous.. Pedicels 3–6.4 cm. long, slender.. Lateral sepals ovate-lanceolate, 4–7 mm. long, 3–4.5 mm. broad, acute.. Lower sepal obliquely and narrowly navicular, 12–15 mm. long, 5–7 mm. deep, abruptly constricted into a 3.2–4.6 cm. long curved filiform spur.. Dorsal petal suborbicular, 1.2–1.7 cm. long, 1.4–2.1 cm. broad, slightly emarginate at the apex, dorsally with a narrow crest.. Lateral united petals 21–26 mm. long; upper petal of each pair oblong-obovate, generally rather asymmetrical, or kidney-shaped, 1.2–2.5 cm. long, 1–1.4 cm. broad; lower petal of each pair broadly oval or obovate, 1.8–2.1 cm. long, 1–1.3 cm. broad, distally with a slight emargination along the inner margin.. Ovary glabrous.. Fruit unknown.. Fig. 3/21, p. 6.
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