Commemorating J. Clayton (1686–1773) English doctor and botanist.
Annual erect herbs. Leaves in a basal rosette, lanceolate to spoon-shaped or rhomboid, long-stalked. Flower cluster with two leaves below. Sepals persistent. Petals 5, free or shortly united at the base. Stamens 5. Ovary superior, ovoid, ovules 3. Stigmas 3 on a long style. Fruit a 3-valved capsule; seeds 3.
26 species mostly from N America but extending to E Asia.
Source: (1997). Portulacaceae. In: . Horticultural Flora of South-eastern Australia. Volume 2. Flowering plants. Dicotyledons. Part 1. The identification of garden and cultivated plants. University of New South Wales Press.