Japan Flora: Erect, glabrous perennial; stems erect, sometimes branched, 40-100 cm. long; leaves rather firm, elliptic, ovate-oblong, or oblong, 4-8 cm.  long, 2-4 cm. wide, rounded to subacute, mucronate, subauriculate and clasping at base, sessile, glaucous above, duller beneath;  nflorescence as long as the leaves, pedunculate, sparsely branched, densely flowered, the pedicels rather short, 3-7 mm. long; calyx-segments narrowly ovate, sometimes ciliolate; corolla yellowish, the lobes narrowly ovate, about 3 mm. long; corona-lobes subrounded, short; follicles nar­rowly lanceolate, about 5 cm. long, 6-7 mm. wide. July-Aug.

Shikoku, Kyushu. Korea, Manchuria, Mongolia, and China.

F. castaneum (Makino) Ohwi.  Flowers purplish brown.