Botanical illustration is the art of depicting the form, color, and details of plant species. They are generally meant to be scientifically descriptive about subjects depicted and are often found printed alongside a botanical description in books, magazines, and other media. Some are sold as artworks. Often composed by a botanical illustrator in consultation with a scientific author, their creation requires an understanding of plant morphology and access to specimens and references. Many illustrations are in watercolour, but may also be in oils, ink, or pencil, or a combination of these and other media. The image may be life-size or not, though at times a scale is shown, and may show the life cycle and/or habitat of the plant and its neighbors, the upper and reverse sides of leaves, and details of flowers, bud, seed and root system. The fragility of dried or otherwise preserved specimens, and restrictions or impracticalities of transport, saw illustrations used as valuable visual references for taxonomists. In particular, minute plants or other botanical specimens only visible under a microscope were often identified through illustrations. To that end, botanical illustrations used to be generally accepted as types for attribution of a botanical name to a taxon. However, current guidelines state that on or after 1 January 2007, the type must be a specimen 'except where there are technical difficulties of specimen preservation or if it is impossible to preserve a specimen that would show the features attributed to the taxon by the author of the name.' (Arts 40.4 and 40.5 of the Shenzen Code, 2018). Source: Wikipedia (en)