Orobanche densiflora, Salzm. ex Reuter

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 : 290-291

20. O. densiflora Salzm. ex Reuter in DC., Prodr. 11:19 (1847).

Stems 15-40 x O-6-O-8 cm, more or less strongly swollen at base, glandular-pubescent but more or less glabrescent below, reddish. Leaves 20-30 mm, oblong-lanceolate, acute. Spike 5-10 x 3-35 cm, dense, glandular-pubescent to more or less villous; bracts 15- 20 mm, lanceolate, acuminate. Calyx 7-12 mm; segments free or shortly connate at base, unequally bifid. Corolla 10-18 mm, glandular-puberulent to subglabrous, yellowish, erecto-patent to patent, tubular, slightly curved; upper lip emarginate to 2-lobed; lobes of lower lip subequal, not ciliate. Filaments sparsely hairy below, more or less glabrous above, inserted 1-5-4 mm above base of corolla, with wide, more or less deflate base; anthers glabrous. Stigma yellow. Capsule 8-9 mm. On Leguminosae ; perhaps also on Compositae . W.C. Portugal, S.W. Spain. Hs Lu?Sa?Si. (21-27). O. minor group. Stems 10-70(-100) x 0-3-1 cm, variably swollen at base, glandular-pubescent to villous, yellowish, more or less tinged with purple, red or brown. Leaves 10-25 mm. Spike 3-30 x 2-4 cm, usually lax below, more or less dense above, glandular-pubescent; bracts 7-22 mm, lanceolate, acuminate. Calyx 7-16 mm; segments free. Corolla 10-23 mm, erecto-patent to more or less patent, tubular or narrowly campanulate, curved or nearly straight; lower lip not ciliate. Filaments hairy below (sometimes only sparsely), subglabrous above, inserted 1-5-6 mm above base of corolla; anthers glabrous. Capsule 8-10 mm. 1 Stigma yellow

2Stamens inserted (4-)5-6 mm above base of corolla; on Euphorbia esula 23. esulae

2 Stamens inserted 2-4-5 mm above base of corolla

3 Corolla pale yellow throughout 27. minor

3 Corolla tinged with red, violet or brown

4 Leaves ovate; corolla yellow tinged with red 22. canescens

4 Leaves linear-lanceolate to -oblong; corolla white or

cream, usually tinged with violet, pink or brown

21. amethystea

1 Stigmaredorpurple

5 Corolla tinged with pink, red or brown

6 Calyx-segments3- to 4- veined,notfiliformdistally 21. amethystea

6 Calyx-segments 1 -veined, filiform distally 24. calendulae

5 Corolla tinged with purple or violet

7 Bracts 7-15 mm; stamens inserted 2-3 mm above base of

corolla 27. minor

7 Bracts10- 22 mm; stamensinserted3-5 mm abovebaseof

corolla

8 Corollarather sharply inflected near the base, the upper lip

deeply bifid 21. amethystea

8 Corolla not inflected near the base, the upper lip emarginate

or slightly bifid

9 Corolla 12-15(-20) mm, glandular-pubescent on tube, glabrous distally 25. grisebachii

9 Corolla 14-22 mm, subglabrous or glandular-puberulent (rarely glandular-pubescent) throughout 26. loricata