羽叶花属 （Acomastylis Greene）为植物界之一植物属。该植物于植物分类表上，归于被子植物门（Angiospermae）蔷薇亚纲（Rosidae）蔷薇亚科（Rosoideae），同科者尚有棣棠花属（Kerria DC．）、悬钩子属（Rubus L.）等等。

Geum /ˈdʒiːəm/, commonly called avens, is a genus of about 50 species of rhizomatous perennial herbaceous plants in the rose family, widespread across Europe, Asia, North and South America, Africa, and New Zealand. They are closely related to Potentilla and Fragaria. From a basal rosette of leaves, they produce flowers on wiry stalks, in shades of white, red, yellow, and orange, in midsummer. Geum species are evergreen except where winter temperatures drop below 0 °F (−18 °C). The cultivars "Lady Stratheden" and "Mrs J. Bradshaw" have gained the Royal Horticultural Society's Award of Garden Merit.