Spiderling

Annual or perennial herbs, often from a rootstock, erect or loosely spreading. Leaves opposite, often in unequal pairs, sometimes fleshy, entire or shallowly sinuate. Inflorescences terminal and axillary, paniculate, umbellate or cymose. Flowers small, quickly falling off, bisexual. Perianth: lower part constricted above ovary, upper part petal-like, campanulate, slightly 5-lobed, caducous. Stamens 1-4(-6); stamens or styles exserted or included. Fruit fusiform, clavate or turbinate, conspicuously 3-5(-6)-ribbed, glabrous or glandular pubescent, but without glands.