Tiny yellow flowers surrounded by rosette of green-yellow bracts. No petals, 4 triangular sepals. Leaves short-stalked, rounded, slightly hairy. Growing in opposite pairs along creeping stems. Erect flower stems. Loosely tufted plant. Forms dense flat mats. Height: To 15 cm.
Damp or wet woodland, by streams, springs and in mountain flushes. Frequent except in central Ireland.