Nearly glabrous green annual; stem creeping and branching below ascending above,15-50cm Long; leaves soft but rather thick, ovate-lanceolate, abruptly acute at apes,subabruptly narrowed below to a membranous sheath with long-pubescent mouth, 5-7cm long, 1-2.5cm wide, glabrous; spathe broadly cordate, rounded or with a shortcusp at apex, nearly 2cm long, glabrous or loosely pubescent sutside; flowers blue,about 2mm across, the 2 lateral petals large and orbicular clawed at base, the centralone small and rsrally white. -June -Sept. (Korea)