Acaena microphylla, scarlet biddy biddy, bidibid,  or piripiri is endemic to the North Island. It is found in grasslands, river-beds and herbfields up to 750m asl, in lowland to low alpine regions of the Volcanic Plateau and the Ruahine Ranges.  A prostrate and wide-spreading plant with slender to rather stout, creeping and rooting stems, it makes it an excellent groundcover or rockery plant, and also great for erosion control on banks and for retaining walls. It is one of the smaller species of Acaena, and has a very neat tidy habit, and its grayish  or bronzy green foliage is attractive all year. It has white flowers from October  to December, then scarlet-red seed heads that make an attractive display from December to February.