Wahlenbergia Schrader ex Roth

Tutin, T. G., Heywood, V. H., Burges, N. A., Moore, D. M., Valentine, D. H., Walters, S. M. & Webb, D. A., 1976, Flora Europaea. Volume 4. Plantaginaceae to Compositae (and Rubiaceae), Cambridge University Press : 98-99

11. Wahlenbergia Schrader ex Roth 2

Flowers solitary or in lax panicles. Calyx 3- to 5-fid. Corolla 3- to 5-lobed, campanulate or infundibuliform. Stamens 3-5; filaments somewhat dilated at base; anthers free. Ovary (2-)3- to 5-locular. Style included, hairy, especially above; stigmas (2-)3-5, short. Capsule dehiscing by (2-)3-5 apical valves.

Slender, procumbent perennial; flowers solitary, axillary 1. hederacea Erect annual; flowers in a lax panicle 2. nutabunda