Its single or few simple, upright, round, reddish shoots are somewhat two-to-six-sided and arise from a woody base.

[clarification needed] The leaf blade may be broad, elliptical, elongate or oval in shape, with a green to deep, ruby-red (in full sun) hue.

The leaf margin is roughly notched, with a wavy edging, sometimes with one or several bluntly jagged lobes.

[1] A winter-bloomer, K. sexangularis' inflorescence consists of flat-topped panicles up to 30 cm (11.8") in length.

The pale pink, square-cylindrical to almost pyramidal corolla tube is enlarged in the lower half and 8 to 13 millimeters long.