These tall perennials from China and Japan are sometimes still listed as Bocconia, a name properly belonging to their shrubby tropical relatives. The two species described below resemble each other. Both have creeping rhizomes; tall, erect stems; large, deeply lobed leaves much like those of edible fig (Ficus carica); and small flowers in large, branching clusters. These plants have a tropical look, and their value lies in size and structure rather than flower color. Can be invasive if not controlled; plant among shrubs rather than amid delicate perennials. Resist deer.
M. cordata. PLUME POPPY. To 78 ft. tall, with 3-ft.-wide clumps of grayish green, 10-in. leaves and clouds of tiny white to beige flowers. Considered somewhat less invasive than M. microcarpa.
M. microcarpa. Resembles M. cordata but has pinkish beige flowers. Flowers of 'Kelway's Coral Plume' are more decidedly pink.