Photographs: Ballyvourney, Co. Cork

Two-spined Pirri-pirri-bur / Two-spined Acaena Acaena ovalifolia Spíochnó Family: Rosaceae Flowering: Early summer. Evergreen perennial. Introduced. Round heads of petal-less flowers followed by burrs with 2 barbed spines. Bright-green leaves with (usually) 9 leaflets, narrow oblong-oval. Stems woody at base, hairy. Prostrate, rooting, mat-forming. An occasional garden escape found in woodland and on paths. Can be invasive. Identified by Paul Green, BSBI Similar: Bronze Pirri-pirri-bur, Acaena anserinifolia

Two-spined Pirri-pirri-bur, Acaena ovalifolia, Spíochnó