131339 GREATER KNAPWEED Centaurea scabiosa (Asteraceae) Height to 1m. Elegant perennial. Stems are stiff, downy, grooved and swollen beneath the base of the plant. Grows in dry grassland, mainly on calcareous soils. FLOWERS are borne in heads, 3-5cm across, with reddish purple disc florets (the outer ones are elongated, spreading and ray-like) and a swollen base coated with brown bracts; heads are solitary (Jun-Sep). FRUITS are hairless achenes. LEAVES are oblong and deeply pinnate. STATUS-Locally common in S and E England; scarce or absent elsewhere.