Common star thistle; star knapweed; cardials stellatus, jacea ramosissima, stellata, rupina, centaurea calcitrapa Lin. Sp. Pi. 1297.

It grows near highways, on commons, and flowers in June. The leaves are bitter; a drachm of the seed, in a glass of wine, is said to expel viscid matter which obstructs the urinary passages: the root is used against the gravel, and the stone in the bladder; and the bark of the root is extolled in the nephritic colic. It should be gathered about the end of September, and, when dried, the dose is a drachm. It scarcely differs, however, in its effect from other bitters, and is now little used. Dale.

Calcitrapa offic. St. Barnaby's thistle; called also cardials stellatus lutea, carduus solstitialis, spina solstitialis, jacea stellata, jacea lutea capite spinosa minori, and leucanthe veterum. Centaurea solstitialis Lin. Sp. Pl 1297.

It is commended as an anticteric, anti-cachectic, and lithontriptic, but is in reality only a weak tonic, perhaps an antacid. Dale.