Acaena Plant with Image

Name	Acaena
Family	Rosaceae
Species	100
Acaena is a genus of about 100 species of perennial herbs and subshrubs in the Rosaceae, native mainly to the Southern Hemisphere, notably New Zealand, Australia and South America, but with a few species extending into the Northern Hemisphere, north to Hawaiʻi (A. exigua) and California (A. pinnatifida). The fruit is also a dense ball of many seeds; in many (but not all) species the seeds bear a barbed arrowhead point, the seedhead forming a burr which attaches itself to animal fur or feathers for dispersal. Several Acaena species in New Zealand are known by the common name bidibid. These names are the English rendition of the original Māori name of piripiri.