Herb
with milky sap; stems pubescent, prostrate, often red; leaves
opposite, simple, broadly ovate, margin toothed; flowers minute,
clustered into cup-like cyathia; cyathia borne in the leaf axils;
cyathial appendages petal-like, 4, white to pink, each with a
minute gland at the base; capsules pubescent, emerging laterally
through the cyathium wall.
