Different names of blue flower, polygala tenuifolia (pharmacology of Nanning), Hedysarum hedysari and old snake medicine (catalogue of medicinal plants in Guizhou).

The source is the whole plant of calyx of Scrophulariaceae.

Subject source dicotyledonous plant medicine Scrophulariaceae plants have opposite leaves and stipes; Leaf blade ovate, 2 ~ 3 cm long, acute at the apex, broadly cuneate at the keelung, with obtuse serrations at the edge.

Flowers are usually born in axils near the top; Pedicels are stout and longer than leaves.

The fruit is twice as long as the leaves; Calyx is 10 ~ 12 mm long, with 5 wings, and the fruiting time can reach 2 cm. Corolla purple-blue, about 2 cm long, upper lip 2-cleft, lower lip 3-cleft; Stamens 4, anthers inserted in pairs.

Capsule, hidden in persistent calyx. Flowers bloom in summer and autumn.

Born on wet grass.

Distributed in southern China.

Collection in summer and autumn is generally used less.

Nature and taste Nanning Pharmacology: sweet, cool and non-toxic.