Orobanche purpurea, Jacq.

Tutin, T. G., Heywood, V. H., Burges, N. A., Moore, D. M., Valentine, D. H., Walters, S. M. & Webb, D. A., 1972, Flora Europaea. Volume 3. Diapensiacea to Myoporaceae, Cambridge: Cambridge University Press : 289

9. O. purpurea Jacq. , Enum. Stirp. Vindob. 108, 252 (1762)

( Phelypaea caerulea (Vili.) C. A. Meyer ).

Stems 15-60 x 0- 3-0- 8 cm, slightly swollen at base, usually simple; whole plant minutely glandular-puberulent, often with a greyish tinge. Leaves 7-20 mm, narrowly lanceolate, usually sparse above. Inflorescence 5-20 cm, rather dense; bracts 8-15 mm, lanceolate; bracteoles linear, shorter than calyx; lower flowers usually subsessile, rarely with pedicels up to 15 mm. Calyx 8-15 mm; teeth lanceolate, about equalling the tube. Corolla 18—25(—30) mm, erecto-patent, or inflected and more or less patent distally, narrowly campanulate, white below, bluish-violet distally with deep violet veins; lobes of lower lip ovate-elliptical, rounded to apiculate. Filaments glabrous or subglabrous, inserted c. 7 mm above base of corolla; anthers glabrous or subglabrous. Stigma white or pale blue. Capsule 8-9 mm. 2n = 24. On Achillea spp. and other Compositae . Europe, northwards to C. England, S.E. Sweden and S. C. Russia. Au Be?B1 Br Bu Co?Cr Cz Da Ga Ge Gr He Ho Hs Hu It Ju?Lu Po Rm Rs (C, W, K, E) Su Tu. O. uralensis G. Beck , Biblioth. Bot. (Stuttgart) 19: 132 (1890), from E. Russia, differs only in having slightly longer hairs throughout and the corolla without deep violet veins. It grows on Artemisia spp. Sect, Orobanche (Sect. Osproleon Walk.). Stems simple. Flowers sessile, without bracteoles. Calyx split above and below almost or completely to the base, and thus divided into 2 lateral segments, which may be entire or equally or unequally bifid. Corolla variously shaped, usually tinged with yellow, brown or red; upper lip 2-lobed to entire.