It is a very common wild vegetable flower. People have been eating bitter vegetables for more than 2000 years, and they are often used as herbs. There are many kinds of bitter herbs, including bitter herbs with purple flowers, that is, bitter herbs with purple flowers.

As shown in the figure:

Extended data:

Alias: purple tea grass, tea grass, bitter grass, bitter velvet, wormwood and so on. Annual herbs or slightly semi-shrubby, plants have bitter taste.

The stems are solitary or few, gray-white, slightly lignified at the base, hairy at the upper part, with a few short branches, thick papery leaves with gray-white pubescence on them, and the base is usually small without jia ye or jia ye;

The upper leaves and bracts are pinnately cleft, the head is elliptic, the corolla is tubular or cup-shaped, there are glandular points outside, the anthers are narrowly linear, the style is nearly equal to or slightly longer than the corolla, and the corolla is purple.

References:

Kucaihua-Baidu Encyclopedia