Perennial, geophytic herb, 700-300 mm high; stems 70-270 mm high, unbranched. Leaves opposite and decussate; blade 30-70 x 10-20 mm, lanceolate to ovate-triangular; petioles 3-5 mm long. Inflorescences 3-5 per stem, 5-9-flowered; peduncles 10-50 mm long; pedicels 5 mm long. Flowers: corolla lobes 7-9 x 3-4 mm, flat, yellow-green; corona 3-4 mm long, much exceeding gynostegium, yellow-green; each lobe narrowly elliptic to broadly sagittate in dorsal view, acute at apex, erect, ventral side with median longitudinal groove. Flowering time Sept.-Nov., Feb. Fruit?