This section is from the book "Handbook Of Hardy Trees, Shrubs, And Herbaceous Plants", by W. Botting Hemsley. Also available from Amazon: Handbook of hardy trees, shrubs, and herbaceous plants.
Perianth usually composed of 6 segments arranged in 1 or 2 regular whorls, all or some of them coloured, or rarely green. For exceptions see Aroideae and Typhaceae.
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