This section is from the book "Commercial Gardening Vol2", by John Weathers (the Editor). Also available from Amazon: Commercial Gardening, A Practical & Scientific Treatise For Market Gardeners.
This genus contains several species of hardy or half-hardy annuals, which may be raised like China Asters every year. The best-known kinds are Grahami, 2 ft., with lilac, rose, and yellow flowers; pinnatus, 2 ft., blue, lilac, or purple, with many varieties, including a dwarf "Tom Thumb" strain; retusus, 2 ft, deep rose blotched with yellow (fig. 243). Wisetonensis is a fine bushy free-flowering plant, useful for pot work or for planting out. All kinds are remarkable for having the leaves finely divided and cut.
Fig. 243. - Schizanthus retusus.