Plebeian Sage (Salvia plebeia, 荔枝草).
A herbal plant I find scattered around Changsha though more often in places closest to the hills or up on them. The flowers appear in a range of colours: most often shades of blue or purple but sometimes they take a reddish tinge from the opposite side of the rainbow and sometimes they are white. It is used in Traditional Chinese Medicine to clear heat and detoxify the body.
