Thyme Broomrape
Orobanche alba
An annual, or possibly perennial, root parasite of Thymus polytrichus. Its principal habitat is base-rich rocky coastal slopes, but it also occurs inland on stabilised scree below limestone outcrops in N. England. Generally lowland, but reaching c. 490 m at Nappa Scar, Wensleydale (N.W. Yorks.).