ABSTRACT
Annual plant 25. D. thymiflorum. 20. Bracts smooth-edged or with one or 2 denticles at base or on sides only
in lower flowers 21. + Bracts in upper half incised into awned acuminate, (3) 4-11 (15) lobes
and teeth 24. 21. Leaf blades green or greyish green on both surfaces, glabrous or with
diffuse simple hairs 22. + Leaf blades green on upper surface, whitish grey beneath due to
compact fine tomentum 11. D.jacutense. 22. Flowers yellowish white. Bracts longer than calyx 23. + Flowers light-dark blue or blue-violet. Bracts shorter than calyx
24. D. stellerianum. 23. All leaves in inflorescence smooth-edged, cauline and radical leaves
elongated-oblong to ovate, smooth-edged or unevenly crenate-dentate, broadest in midportion of blade, gradually narrowing toward base. Bracts oblong or ovate, with or without cusp at tip, smooth-edged or with one denticle 5. D. fragile.
+ Lower leaves in inflorescence more or less crenate-dentate, cauline and radical leaves broad-to oblong-ovate, crenate-dentate, very rarely smooth-edged, broadest in lower half of blade, with broad-cuneate, truncated or faintly cordate base. Bracts cunéate, with 2 or 3 sharp teeth
