philadelphicus is a perennial herb originating in
North America, growing wild broadly in Japan. Stems are
hollow, rising to 0.3-1m in height; the whole is with
vellus hairs. Radical leaves are still alive in
flowering time, and the lower part of on-stem leaves are
long, oblong, or spatulate, with winged petioles. Bases
of on-stem leaves expand sideways in the way of ear
lobes to embrace the stems. Flower heads are 2-2.5cm
across, with many white to light purple ray florets.
Bloom time: May-July.