Plants in the crassulaceae, or stonecrop family are succulents, with fleshy, undivided leaves, often very small, and five-petalled flowers, containing five or ten stamens and five carpels. Most flowers are star-shaped, with unfused petals, but in one UK species (pennywort) the corolla is cylindrical. There are about 16 crassulaceae species in the British Isles, including a few garden escapes.