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Sclerocarpus
Sclerocarpus is a genus of flowering plants in the tribe Heliantheae within the family Asteraceae. Bonebract is a common name for plants in this genus.
It includes annuals and procumbent perennials which occur primarily in Mexico and Central America, with one species extending as far north as the state of Texas in the United States and another species widely distributed across the West Indies, South America, Africa, and Asia. The genus is distinguished morphologically by the pales, which are modified to completely and tightly enclose the mature cypsela (achene) and often have a tuberculate surface. Some species of Aldama have a somewhat similar modification of the pales but in those the pale surface is irregularly wrinkled and pitted rather than tuberculate.
Text excerpted from the Wikipedia article Sclerocarpus by its contributors, under CC BY-SA 4.0; the excerpts are shared under the same licence.
