Canellales, order of flowering plants consisting of 2 families (Winteraceae and Canellaceae), 15 genera, and 136 species. Together with three other orders (Laurales,Magnoliales, andPiperales), Canellalesconstitutes the magnoliids clade, which is an early branch in theangiospermtree.

Distribution and abundance

Winteraceae has 9 genera and 120 species, with a mostly Southern Hemisphere distribution.Takhtajania, a genus with a single species (T. perrieri), occurs in Madagascar and is the most distinctive member of the family.Pseudowintera (3 species) is restricted toNew Zealand.Drimys (about 8 species) occurs in Central and South America, from Mexico to Tierra del Fuego; one species is restricted to theJuan Fernández Islands off the coast of Chile, where it is one of the most common forest trees. Molecular research supports the separation of the Old World members ofDrimys into the genusTasmannia (with about 40 species), which extends from the Philippines to Australia (including Tasmania) and reaches its greatestdiversity inNew Guinea. The circumscription ofZygogynum has led to the recognition of 3 additional genera, includingExospermum (restricted to New Caledonia),Bubbia (from the Moluccas to New Caledonia and Australia, with one species confined toLord Howe Island, where it is abundant), andBelliolum (in New Caledonia and the Solomon Islands).

Canellaceae has 6 genera and 16 species. There is one genus each in tropical Africa (Warburgia) and Madagascar (Cinnamosma), two genera in tropicalSouth America (Capsicodendron andCinnamodendron), and two in the Caribbean (Canella andPleodendron).

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Economic and ecological importance

Most members of Winteraceae have little economic importance.Drimys winteri varietychilensis iscultivated in many parts of the world in gardens and arboretums. A small bushy tree in cultivation, it flowers for most of the year and has attractive white-petaled flowers that are about 2.5 cm (1 inch) in diameter. The species name refers to Capt. John Winter, who obtained specimens in 1578 from theStrait of Magellan onSir Francis Drake’s voyage around the world. The bark was once used by sailors as a tonic and as ascurvy preventative. It still has some use as an astringent and a stimulant.

The leaves of many Winteraceae have a peppery taste, which discourages browsing animals. In parts of New Zealand, where introduced deer have had serious effects on the shrubs and young trees in native forests,Pseudowintera has increased because it is unpalatable to deer.

The family Canellaceae is also of relatively little economic importance. The leaves and bark of the West IndianCanella alba (wild cinnamon), known sometimes by thesynonymC. winterana, have some use as a condiment and for medicinal purposes. It has been used to flavour tobacco and as a fish poison. The timber is known as Bahama whitewood. The trees of this species are cultivated to a limited extent in southern Florida as ornamentals prized for their reddish purple flowers and red berries.

Characteristic morphological features

Winteraceae are evergreen trees and shrubs with alternately arranged leaves and primitively vesselless wood. To restrict transpiration, most species of Winteraceae grow in damp, shady habitats, and their stomata (restricted to the underside of the leaves) are partly obstructed by a somewhat porous, waxy material (cutin) thatresembles a sponge under high magnification. Except inTasmannia, the flowers are bisexual with a small cup of sepals fused to varying degrees and spirally arranged mostly white petals. One member,Belliolum, has leaflike stamens somewhat similar toDegeneria (family Degneriaceae). Except inBelliolum, the stamens have terminal pollen sacs, and, except in a few species ofZygogynum, the distinctive pollen is in tetrads with reticulate sculpturing on the exposed surface. The carpels may be free from each other or fused together, and most fruit of the family is indehiscent and berrylike. Pollination in various members of Winteraceae is carried out by beetles, primitive moths, flies, thrips, and even caterpillars.

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Members of the family Canellaceae have leatheryalternate leaves, commonly with translucent spots. The flowers contain 3 sepals, 4 to 12 petals (either arranged in a spiral or a whorl), and 6 to 40 stamens, which are united into a tube, a characteristic feature for the family. The pollen has only a single aperture. Between two and six carpels are fused to form a single locule in which the ovules are attached to the inner surface of the locule wall (parietal placentation). The fruit is a berry.

Evolution

Winteraceae has afossil record dating to theAptian Stage (125 million to 113 million years ago) in theCretaceous Period (145.5 million to 65.5 million years ago). The minute, relatively undifferentiated embryo, which occupies only a small part of the seed at maturity, and the vesselless wood of Winteraceae species are generally interpreted as a primitive character. The stamens range from a putatively primitive leaflike form (Belliolum) to more-advanced forms having an elongated filament and terminal anther (Tasmannia).Takhtajania perrieri is unusual in the family in apparently having a flower with an ovary consisting of two fused carpels withperipheral ovules.