is an annual found on a roadside, riverbank, etc., the 50-70cm stem
erecting straight up without branching, with alternate, relatively
thick, simple leaves on them. The leaves lack a leafstalk, the base
embracing the stem. P. viscosa bears a single 2-3.5cm wide,
lip-shaped, yellow flower at an axil on the upper part of the stem.
Reportedly, this species originates in Europe.