Ko e siolaʻā (Helianthus) ko e fuʻu ʻakau siʻi ia, ʻomi mei ʻAmelika. ʻOku ʻi ai ʻi māmani ngaahi faʻahinga ʻe 67, kā ko e faʻahinga ʻoku faʻafai ʻi Tongá ni ko e H. argophyllus ia, pe H. annuus. ʻOku lahi ʻaupito hono matala, mahalo pē senitimita ʻe 20 tupu.