Tordylium L.

Tutin, T. G., Heywood, V. H., Burges, N. A., Moore, D. M., Valentine, D. H., Walters, S. M. & Webb, D. A., 1981, Flora Europaea. Volume 2. Rosaceae to Umbelliferae, Cambridge University Press : 367

94. Tordylium L. 1

Leaves simple, pinnatisect or pinnate. Sepals prominent, often unequal. Petals whitish or purplish, cuneate or clawed, outer larger and often 2-lobed; apex inflexed. Fruit orbicular or ovateelliptical, strongly compressed dorsally; margin strongly thickened, usually corrugated or lobed; dorsal ridges inconspicuous; vittae usually solitary. 1 Rays 20-40 5. byzantinum

1 Rays not more than 15

2 Fruit setose; thickened margin smooth 1. maximum

2 Fruit with soft hairs; thickened margin corrugated

3 Stem stout, sparsely hairy; outer flowers with 1 large, ±equally 2-lobed petal; fruit 5-8 mm 4. apulum

3 Stem slender, tomentose; outer flowers with 2 large, unequally 2-lobed petals; fruit 2-5 mm

4 Stems 20-50 cm, softly hairy; fruit 2-3 mm, with vesicular hairs 2. officinale

4 Stems up to c. 15 cm, setose; fruit 3-5-5 mm, with soft flexuous hairs 3. pestalozzae