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.
Pretty dwarf foliage plants recognized by their deeply ribbed leaves, often conspicuously spotted with distinct colours and washed with tints of various hues. Some good kinds are argentea, guttata, mar-garitacea, punctatissima, marmorata, superbissima, Van Houttei, etc. They require stove treatment, and are raised from seeds and cuttings.