Trachelium L.

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 : 94

6. Trachelium L. 1

(incl. Diosphaera Buser )

Flowers in corymbs, rarely solitary and axillary. Calyx 5-fid.

Corolla tubular, with 5 lobes. Stamens 5; filaments glabrous;

anthers free. Style long-exserted, thickened towards the apex;

stigmas 2-3. Capsule dehiscing by 2-3 pores near the base. 1 Stems less than 5 cm; flowers 1-5 in the axils of the upper leaves 3. asperuloides

1 Stems more than 5 cm; flowers in corymbs

2 Stems leafless for some distance below the inflorescence; leaves mostly petiolate 1. caeruleum

2 Stems leafy up to the inflorescence; leaves mostly sessile 2. jacquinii