Plectranthus monostachyus (P.Beauv.) B.J.Pollard

An annual herb. It is erect and branched. It grows 1 m tall. The stems are 4 angled. They have short hairs. The leaves are simple and opposite. They are 5-9 cm long by 3-6 cm wide. They are wedge shaped at the base and taper to a short tip. The flowers are in groups at the top. It has long flower arrangements of violet flowers. The fruit is made up of 4 nutlets. These are 1 mm across. There are 4 subspecies.

Found in a range of habitats; growing as an annual weed in anthropogenic habitats, but also as a perennial herb or even subshrub in rocky savannah.

The leaves are cooked and eaten as a potherb.

Can be grown by seedlings.