Anagallis arvensis.

Botanical name: 

Anagallis arvensis Linn. Primulaceae. Pimpernel. Poor Man's Weatherglass. Shepherd's Clock.

Europe and temperate Asia. Pimpernel, according to Fraas, is eaten as greens in the Levant. Johnson says it forms a part of salads in France and Germany. The flowers close at the approach of bad weather, hence the name, poor man's weatherglass.

Sturtevant's Edible Plants of the World, 1919, was edited by U. P. Hedrick.