Upright or rather straggling moderately branched perennial 40–80 cm. tall at the most; stems glabrous, rarely sparsely pubescent on the youngest parts.. Leaves spirally arranged, sessile or with a glabrous to slightly pubescent petiole (1–)3–7 mm. long; lamina narrowly-oblong, oblong-lanceolate, elliptic, ovate or oblanceolate, 2.5–10(–12.5) cm. long, 1–4 cm. broad, the apex ± acute, rarely shortly acuminate, the base cuneate, usually glabrous but sometimes sparsely pubescent above or beneath; lateral veins 6–10(–12) pairs, especially prominent beneath; margin crenulate-denticulate.. Flowers in fascicles of 2–5, sometimes solitary, usually borne on a very reduced, 1–4 mm. long, peduncle, white or pink.. Bracts narrowly ovate, linear-lanceolate or subulate, 2–4 mm. long.. Pedicels 2–5.5 cm. long, slender, glabrous or slightly pubescent, ascending or horizontal in flower but becoming pendent in fruit.. Lateral sepals ovate to ovate-triangular, 6–10 mm. long, 2.5–5 mm. broad, acute or shortly apiculate, usually glabrous, occasionally sparsely pubescent.. Lower sepal shallowly to deeply navicular, 12–20 mm. long, 5–11 mm. deep, abruptly constricted into a short, 4–9(–10) mm. long, straight, curved or more rarely incurved spur, usually slightly swollen at the tip, glabrous or ± pubescent.. Dorsal petal 9–15(–17) mm. long, 6–11(–13) mm. broad (unflattened!), cucullate, dorsally with a broad crest terminating in a short appendage.. Lateral united petals 18–31 mm. long, with a small (± 2 mm.) rounded auricle along the inner margin where the two petals unite; upper petal ± 3/4 the size of the lower, oblong or semi-elliptic, 9–14 mm. long, 4–7 mm. broad; lower petal broadly and transversely oblong, elliptic or ovate, 10–18 mm. long, (6–)8–11 mm. broad, with a slight emargination along the inner margin.. Ovary glabrous.. Fruit broadly fusiform, 12–18 mm. long, 6–8 mm. broad, glabrous.. Fig. 3/48a–b, p. 6.
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