2n = 72

Habit of radicate group, stems branching from the base, somewhat fleshy and brittle, the upper 2/3 of the plant forming a many-flowered much-branched multiple panicle. Leaves dark green, sessile, rather fleshy, oblong to obovate-spathulate to oblanceolate to lanceolate to linear, margins obscurely dentate to sharply serrate, more or less undulate, up to 40 × 15 mm. Flowers erect on slender pedicels 5—10 cm long, pale blue-violet, paler outside (HCC hyacinth blue 40/2 inside, 40/3 outside), sometimes white. Corolla 18—30 mm diam., 10— 15 mm long, subrotate, broad-petalled, tube saucershaped, 1 × 5 to 1.5 × 6 mm, lobes curving up before spreading, broadly oblanceolate, acute, separate at base, touching or overlapping at widest point, 8 × 5 to 14 × 6 mm. Style thickened and blue at top. Calyx lobes glabrous, 2 × 1 to 4 × 1.5 mm, triangular, erect or spreading. Capsules glabrous, 5 × 3 to 6 × 4 mm, obconic with protruding valves. Seeds 0.5 mm long. FL Oct-Apr, FT Nov-Apr.

W. rupestris similis, differt corolla pallide caesio-violacea, subrotata, 18—25 mm diametro, tubo 1.5 × 5-6 mm, lobis oblanccolatis, 8 × 5 to 14 × 6 mm, usque ad basem scparatis. Caulibus et foliis carnosis.