A samara is a type of fruit in which a flattened "wing" of fibrous, papery tissue develops from the ovary wall. A samara is a simple dry fruit that is bicarpellate (formed from two carpels) and indehiscent (not opening along a seam). The shape of a samara enables the wind to carry the seed away from the parent tree. A particular form of samara is sometimes called a key, where the papery sheath extends far out to one side so that the seed spirals as it falls. Trees with rounded samaras include the elms (genus Ulmus) and the hoptree (Ptelea trifoliata). Trees with the elongated keys include the maples (genus Acer) and the ashes (genus Fraxinus). Samara fruit on a maple, photographed at the botanical garden in Portland, Oregon by Eric Guinther. ... Samara fruit on a maple, photographed at the botanical garden in Portland, Oregon by Eric Guinther. ... Fruit stall in Barcelona, Spain. ... A carpel is the female reproductive organ of a flower; the basic unit of the gynoecium. ... Species See text. ... Species Ptelea trifoliata L. - Hoptree The Hoptree (Ptelea trifoliata, Rutaceae) is a deciduous shrub or small tree 6-8 m tall with a broad crown. ... See also Maple computer algebra system. ... Species Many, see text. ...
A simple fruit is dispersed as a whole (for example, a berry); a rhexocarpic fruit splits open and the seeds are shed from the fruit (for example, a capsule); and a schizocarpic fruit splits into separate fruitlets, which are dispersed (for example, a dill fruit splits into two fruitlets).
An anthocarp is a fruit formed from the ovary and attached floral parts that have undergone marked development after fertilization in order to aid in the dissemination of the seeds.
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