Herbs, perennial, laxly cespitose, mat-forming, glabrous. Stems ascending, branched, (stolonif-erous), not bearing rosettes. Leaves alternate, (densely imbricate on nonflowering shoots), usually in 6 rows (fewer on flowering shoots), ascending, sessile; blade bright green, not glaucous, linear, subterete to terete, 3-6 × 0.8-2 mm, base spurred, not scarious, apex obtuse. Flowering shoots erect, simple or branched, 6-15 cm; leaf blades linear, base spurred; offsets not formed. Inflorescences moderately lax cymes, 5-25-flowered, (1-)2-3(-4)-branched; branches spreading, sometimes forked; bracts similar to leaves, smaller. Pedicels to 0.5 mm. Flowers 5(-6)-merous; sepals erect, distinct, yellowish green, linear-elliptic, unequal, 0.8-1 × 0.4-0.5 mm, apex obtuse; petals spreading, distinct, bright yellow, lanceolate, not carinate, 3-4 mm, apex acute or acuminate; filaments yellow; anthers yellow; nectar scales yellow, square. Carpels divergent in fruit, distinct, dark brown. 2n = 74, 111, 148, 185.
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Much like no. 12 [Sedum acre L.]; lvs linear, subterete, blunt, 3–6 mm, alternate, crowded to form 5 or 6 ranks; infl of ca 3 divergent, sympodial cymes; pet 3–5 mm; 2n=74. Native of Europe, escaped from cult. in N.H. and Vt. June, July.
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