Phtheirospermum japonicum is
a semi-parasitic annual, 30-60cm tall, with dense, tender glandular
hairs and sticky to the touch. Leaves alternate, 3-5cm long, 2-3.5cm
wide, triangular-ovate, and split pinnately. Axils on the upper
branches produce single, about 2cm long, light red-purple flowers.
Corollas are plump-tubular-lip-shaped; upper lips bend backward, the
tips shallowly cut in two, while the lower lips significantly expand
sideways and cleft shallowly in three. Stamens are four in number,
and two are somewhat longer. Calyxes are bell-shaped and split in
five, with margins serrated and relatively dense glandular hairs.
Bloom time: September-October.