Erigeron borealis

Tutin, T. G., Heywood, V. H., Burges, N. A., Moore, D. M., Valentine, D. H., Walters, S. M. & Webb, D. A., 1976, Flora Europaea. Volume 4. Plantaginaceae to Compositae (and Rubiaceae), Cambridge University Press : 119

11. E. borealis (Vierh.) Simmons , Lunds Univ. Ärsskr. nov. ser., 9 (19): 127 (1913).

Like 9 but sometimes up to 30 cm; the oldest basal leaves glabrous, the younger very sparsely hairy; flowering stems less robust, erect or slightly flexuous; capitula usually solitary but sometimes 2 or 3, rarely more; involucral bracts usually more densely hairy. 2n= 18. Meadows and stony ground, mainly in the mountains', calcicele. N. Europe southwards to C. Scotland. Br Fe Is No Rs (N) Su.

Somewhat intermediate between 7 and 9, and often scarcely distinguishable from 9, it might perhaps best be treated as a subspecies.