Succulent perennial herb, ± 40 mm tall (occasionally up to 100 mm). Stems 4-or 5-angled, strongly toothed along angles. Corolla lobes narrowly triangular, at least 1.5 times as long as broad. Inner corona lobes much exceeding anthers, irregularly enlarged at apex, tuberculate (bristly). Flowers buff to yellowish outside, inside marked with maroon or brown-red spots and lines.