|Forsythia japonica is
a deciduous shrub endemic to limestone areas in the Chugoku Region,
growing to 1-2.5m tall. Leaves are of opposite phyllotaxis, in the
shape of a broad-oval, 7-12cm long, 4-6cm wide, apexes abruptly
tapering to points, bases circular, and margins sharply serrated.
Flowers, dioecious, yellow, 2.5cm across, bloom simultaneously as
the leaves develop. Corollas are cleft in 4, the lobes
narrow-oblong, about 12mm long, 5-6mm wide. Sepals measure 2.5-3mm
in length. Bloom time: April.