Descriptions : HerbSmall herb, with 4-angled stems, adventitious roots; leaves opposite, simple, petiolate, ovate or narrowly ovate; base tapering, slightly to distinctly asymmetric; margins serrate; inflorescence a terminal, dichasial cyme, flowers solitary and axillary to bracts; basal bracts narrowly ovate, ovate, or transversely ovate, margins serrate-crenate; upper bracts narrowly obovate (or inflorescence of solitary, axillary flowers if "bracts" are considered leaves); flower with pedicel to a length >2½ cm; calyx of 5 connate sepals, with 5 acute lobes; each sepal keeled dorsally; calyx with appressed hairs; corolla bilabiate, with glandular hairs outside; tube mostly maroon, inside base yellow; upper lobes 2, purple, outside in bud; lower lobes 3, purple with some white; stamens 4, in 2 pairs, adnate to inside of corolla tube; upper pair (posterior) with anthers connivent apically, each anther with 2 locules diverging 180°
; lower pair (anterior) with anthers connivent, each anther with 2 locules diverging 180°
; each lower filament with filiform appendage (to length of >2 mm); ovary glabrous; style filiform glabrous; stigma bilamellate.
