Pterocephalus Adanson

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 : 68

7. Pterocephalus Adanson 1

Annual or perennial herbs or shrubs with usually hairy stems. Capitula hemispherical; the outer florets sometimes radiate. Receptacular scales hairy or absent. Involucel sulcate, with terminal seta, minute teeth or a short corona. Calyx short, stipitate, with 5-24 plumose setae. Corolla 5-fid.

Literature: B. L. Burtt, Notes Roy. Bot. Gard. Edinb. 22: 279-283 (1957).

1 Stems procumbent

2 Leaves entire 5. spathulatus

2 Leaves lyrate, crenate or dentate 6. perennis

1 Stems erect

3 Leaves 1 - to 2-pinnatisect, with linear lobes

4 Annual; fruiting involucel with a long, flattened, curved seta up to 15 mm 3. diandrus

4 Perennial; fruiting involucel without a seta 4. intermedius

3 Leaves lyrate or pinnatisect, with ovate-lanceolate or lanceolate, crenate-dentate terminal lobes

5 Involucel with a narrow, scarious corona and an internal collar surrounding neck of ovary 2. brevis

5 Involucel with a toothed margin, the corona and internal collar absent 1. papposus