is an annual biennial herb occurring everywhere throughout the
country; the whole feels tender and branches well to grow to 10-30cm
in height. Stems are with hairs lined up in a row on one side.
Leaves are opposite, 1-3cm in length, 0.6-2cm in width, in an ovate
shape; those on the upper parts have no hairs. Flowers, 6-7mm in
diameter, look 10-petaled, as petals cut almost into their bases;
stamens are 4-10 in number, and styles (pistils) three. Bloom time: