|Caltha palustris var.
nipponica, a perennial herb height of 30-50cm, inhabits wetlands
or water's edges. Leaves are orbicular, 5-10cm in size, with shallow
serrations on margins. On-stem leaves are small. Stem tops and axils
on upperparts set bright yellow flowers approximately 2cm in
diameter. The flowers lack petals, which make sepals look like
petals. The sepals are 5-6 in number. Many stamens surround pistils.
Bloom time: May-July.