Both of these shrubs, belonging to subfamily Rosoideae, are native to eastern Asia but are cultivated in eastern North America. On the left is Kerria japonica , Japanese Kerria. The plant on the left is Rhodotypos scandens, Jetbead; the common name alludes to the large, shiny black achenes. The latter species in unusual for the Rosaceae in that it has opposite leaves and in the flowers there are only 4 sepals and 4 petals.
Photos by K. R. Robertson, the one on the left on the campus of the University of Illinois, the one on the right at the Arnold Arboretum of Harvard University.
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