The Physocarpus monogynus plant reaches 1.2 meters (4 feet) in height and somewhat more in width.
 The leaves are dull green above and paler below, with 3 to 5 doubly toothed lobes, so they suggest big currant (Ribes) leaves.
 The bark is brownish and shreds, revealing many layers, hence the name "ninebark" (Elmore 1976).

In May or June, mountain ninebark bears "rather lovely" white or rose-colored flowers, with five petals based in a cup-like structure.
 The flowers have one style, the meaning of "monogynus" (literally "one female part").
They turn red-brown and stay on the plant into the winter.
 The seed pods are inflated and covered with white hairs (Elmore 1976).
The seeds are bean-shaped, about 2 mm long, bright shiny yellowish (USDA 2008).
The Physocarpus monogynus plant reaches 1.2 meters (4 feet) in height and somewhat more in width.  The leaves are dull green above and paler below, with 3 to 5 doubly toothed lobes, so they suggest big currant (Ribes) leaves.  The bark is brownish and shreds, revealing many layers, hence the name "ninebark" (Elmore 1976).
In May or June, mountain ninebark bears "rather lovely" white or rose-colored flowers, with five petals based in a cup-like structure.  The flowers have one style, the meaning of "monogynus" (literally "one female part"). They turn red-brown and stay on the plant into the winter.  The seed pods are inflated and covered with white hairs (Elmore 1976). The seeds are bean-shaped, about 2 mm long, bright shiny yellowish (USDA 2008).
Physocarpus monogynus