Chamomilla S. F. Gray

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 : 167

61. Chamomilla S. F. Gray 1

Annuals. Leaves alternate, irregularly 2- to 3-pinnatisect, with numerous linear segments. Capitula small to medium, pedunculate or subsessile. Involucral bracts in two or more rows, with a scarious margin. Receptacle conical, hollow; scales absent. Ligulate florets, when present, female, white; inner florets hermaphrodite, tubular, 4- or 5-lobed. Achenes mucilaginous when wet, slightly compressed, obliquely truncate above; dorsal face convex; ventral face with 3-5 narrow, whitish, longitudinal ribs; pappus absent, or a small corona or auricle.

1 Ligules usually present; tubular florets 5-lobed

2 Stems (2-)10-60 cm; capitula 10-25 mm in diameter (including ligules); plant glabrous 1. recutita

2 Stems 8-15 cm; capitula 7-10 mm in diameter (including ligules); plant±hairy 2. tzvelevii

1 Ligules absent; florets 4-lobed

3 Florets greenish; involucral bracts with a colourless or pale margin; mature achenes at least 1-2 mm 3. suaveolens

3 Florets yellow; involucral bracts with a brown margin; mature achenes not more than 0-9 mm (excluding auricle, if present) 4. aurea