Cephalaria leucantha (L.) Schrad. ex Roem. & Schult.  

An erect or spreading, hairless or almost hairless, branching perennial, to 1m tall. Leaves up to 15 cm long; pinnatifid or pinnatisect, with 2 to 7 pairs of lobes; lobes linear-lanceolate or spathulate, entire or toothed; terminal lobe larger than the rest. Inflorescence a globular cluster of white or pale yellowish flowers, 2 to 3 mm across. Corolla 1 to 1.5 mm long, with 4 more or less equal lobes; anthers white. Calyx hairy, small, cup-shaped, with a membranous ciliate-toothed fringe round the top; 6 mm in fruit. Involucral bracts in several overlapping rows; ovate, with a narrow papery margin. Receptacular scales oblong-spathulate, concave, 7 to 9 mm long.