Acaena anserinifolia, bidibid, hutiwai,  or piripiri is endemic to the North, South, Stewart, and Chatham Islands. Naturalised on the Auckland and Campbell Islands.  It is found in, and abundant from lowland to lower subalpine forest margins and in shrublands. Often grows with Acaena novae-zelandiae but can be recognised by the distinctive tuft of brush-like hairs surmounting the leaf teeth apices. Undersides of leaves are distinctly silvery due to dense covering of appressed silky hairs. White flowers from October to January then spiny seed heads from December to April. It makes a great groundcover as it is a very dense, fast-growing plant. Good for suppressing weeds and preventing surface soil erosion and is excellent for growing over retaining walls. It is quick growing and hardy.