dianthera, an annual height of 20-60cm, occurs on the mountain
fringes or roadsides; stems, the cross-section square, have
downwardly curved short hair on the ridges. Leaves are opposite,
2-4cm in length, oval to broadly oval, somewhat thin, the margins
having coarse serrations. Branch ends produce 3-7cm-long spikes, and
each gives light red-purple or white lip-shape flowers. The upper
lips are cleft in three, and the lower one's tips become hollow.