Disperis nemorosa Rendle

Herb, 8–28 cm. tall, arising from 1–2 round or oblong tubers 1–2.5 cm. long, 0.8–1 cm. wide, spreading by tuber-bearing underground stems.. Leaves 2–4, opposite, sessile or shortly petiolate, sheathing at the base, ovate, 2.5–6.5 cm. long, 1.8–4 cm. wide, acute or acuminate, cuneate to truncate above the sheath.. Racemes 1–4-flowered; flowers white or white and mauve; bracts leaf-like, ovate to ovate-lanceolate, 0.6–2 cm. long, 0.4–1 cm. wide, acuminate.. Intermediate sepal joined with petals to form a very slender spur, 0.9–1.5 cm. long, white or sometimes with pinkish or mauve marks, often green at the apex; lateral sepals irregularly oblong, oblique, 7–8 mm. long, 4–5.5 mm. wide, obtuse, ± free, white, bearing sacs 1–1.5 mm. long.. Petals rounded, broadly rounded at the free apex, auriculate at the base.. Lip light mauve or green suffused with purple, with a slender flattened claw 0.9–1.1 cm. long, ending in a sharply reflexed linear limb 1.5–2 mm. long and bearing at this point a long appendage 0.9–1.2 cm. long directed back to the open end of the spur; appendage linear-oblanceolate, broadened and shortly bifid apically, bearing a pair of spreading oblong obtuse lobes 1 mm. long just before the extreme apex.. Fig. 41.