Japan Flora: Glabrous, tufted, erect perennial, 7-30 cm. high, with stout elongate rhizomes; stems few, simple, striate, densely many-leaved; leaves verticellate in 4’s, thick and lustrous, linear-lanceolate to linear-oblong, 1-2 cm. long, 2-3 mm. wide, obtuse, short- sheathed at base, deep green, whitish beneath; flowers solitary, terminal, sessile, 3.5-4 cm. long, blue-purple; calyx about 1 cm. long, subtruncate at apex, the lobes 6-8, lanceolate, obtuse, shorter than the tube; corolla-lobes 6-8, the plaits bifid, linear; capsules short-stipitate，included; seeds angled, about 3.5 mm. long including the filiform tail at one end. Aug. Alpine;

Kyushu (Yakushima); rare.