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.
A handsome North American hardy herbaceous perennial, known as "Shooting Stars" and "American Cowslips", grows about 1 ft. high, and has tufts of oblong-obovate leaves and umbels of rosy purple or lilac Cyclamen-like flowers on top of an erect stalk. There are several forms, such as Clevelandi, rich violet blue; Hendersoni, bright crimson with a yellow base; integrifolium, rose crimson; Jeffreyanum, purple rose; and patulum, yellow. They are all increased from seeds sown in spring, and by division. The trade is small.