Japan Flora: Stems 20-50 cm. long, nearly glabrous; lower leaves oblong-lanceolate, acute, the upper elliptic to oblong, clasping, abruptly acute, 5-20 cm. long, 2-6 cm. wide, glabrous; flowers axillary and terminal, one or 2, yellow, nearly spotless, 2.5-35 cm. long, the pedicels slightly shorter to longer than the flowers, the tepals narrowly obovate or obovate-oblong, about 1 cm. wide, the inner segments slightly narrower. Sept-Oct.