Achillea impatiens, L.

20. A. impatiens L. View in CoL , Sp. Pl. 898 (1753).

Stems 45-100 cm, erect, branched and puberulent above, glabrous below. Leaves up to 8 cm, lanceolate and acute in outline, pinnatifid, the lobes serrulate; middle cauline 2-pinnatifid, the primary lobes usually each with a single distally directed tooth near the base; lower usually 2-pinnatifid, upper 1-pinnatifid. Corymbs with (1—)3—10 capitula; peduncles 10-30 mm. Involucre 6-8 mm in diameter; bracts c. 4 mm, lanceolate, subobtuse, with an indistinct brownish margin. Ligules 4-5 mm, obovate, white. Damp grassland. C. Romania. Rm. (Siberia.)

European plants probably represent a different subspecies from the typical, less robust plants from Siberia.

Plants from the W. Alps ( A. alpina auct. plur.,?an L., Ptarmica serrata DC. ) which are like 20 but with the lower leaves 1-pinnatifid and the lobes more or less serrate, are hybrids, such as 17 x 20 or 17 x 15, which escape from cultivation.