A monster genus, which depending upon sources, variable definitions and confusion in identification, can contain 1000-2000 species. The majority come from moist or wet habitats, but many are adaptable to sunny, drier locations. Flowers tend to be visually insignificant, but others such as C. elata can be eye-catching. Foliage colour can be a highlight, with greens, blues, yellow, orange, bold variegation and the coppery-browns. Generally semi or wholly evergreen.