The species are annual herbs. They have slender and diffuse stems which sparsely shortstrigose or subglabrous. Their leavesalternate and are ovate-oblong to spatulate. They have thinpedicels and solitary, axillary flowers. Their calyx is 5-parted, slightly enlarged in fruit, and spreading. Their corolla is rotate-campanulate and the stamens are inserted into its tube; they have five throatappendages and fives lobes of limb spreading. Their ovaries are 4-parted, style are not exserted, and stigmas are subcapitate. They have four nutlets which are narrowly ovoid with glochids.