Annual herb, 0.11-0.60 m high. Flowers small, mostly in subsessile or sessile pairs at nodes. Corolla tube 2.7-)3.3-5.8(-6.0) mm long, dilated part a quarter to a third the length of narrow part; narrow part glabrous; dilated part and back of corolla lobes scabrid. Flowers with lobes white, off-white, grey, yellowish green, bluish white or brownish, tube darker.