books.google.co.uk - Robert H. Mohlenbrock provides a definitive account of the pokeweed, four-o'clock, carpetweed, cactus, purslane, goosefoot, pigweed, and pink families in Illinois. Flowering Plants: Pokeweeds, Four-o’clocks, Carpetweeds, Cacti, Purslanes, Goosefoots, Pigweeds, and Pinks is the fifteenth volume of...http://books.google.co.uk/books/about/Flowering_Plants.html?id=UP4FnDJHYpsC&utm_source=gb-gplus-shareFlowering Plants
