C. tomentosum  

Plants perennial, mat-forming, rhizomatous. Stems: flowering stems ascending, branched, 15-40 cm; nonflowering stems prostrate proximally, rooting readily, pu-bescence dense, white-tomentose, eglandular; small axillary tufts of leaves often present. Leaves not marcescent, sessile; blade linear to linear-lanceolate or linear-oblong, 10-60 × 2-8 mm, apex ± obtuse, pubescence dense, whitish-tomentose, eglandular on both surfaces. Inflorescences lax, 3-13-flowered cymes; bracts lanceolate, margins scarious, pubescent. Pedicels ascending, straight, 10-40 mm, 2-7 times as long as sepals, white-tomentose. Flowers 12-20 mm diam.; sepals narrowly lanceolate-elliptic, 5-7 mm, margins narrow, often scarious, apex acute, white-tomentose; petals obtriangular, 10-18 mm, 2-2.5 times as long as sepals, apex 2-fid; stamens 10; styles 5. Capsules cylindric, slightly curved, 10-15 mm, 1.5-2 times as long as sepals; teeth 10, erect, margins convolute. Seeds brown, ca. 1.5 mm, round tubercles on margins, faces shallowly rugose; testa not inflated. 2n = 72.