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PURPLE TOOTHWORT Lathraea clandestina (Orobanchaceae) Subterranean. Distinctive perennial. Entirely parasitic on the roots of trees such as poplars, willows and alders and grows in damp woodland. The main visible signs of the plant above ground are the flowers; sometimes these form large patches. FLOWERS are 4-5cm long, the corolla purple and held erect (Mar-May). FRUITS are capsules. LEAVES are scale-like and borne close to the ground. STATUS-Introduced and naturalised locally.