Annual or perennial herbs or small shrubs with woolly branches. Leaves alternate, linear or subterete. Flowers axillary solitary or paired, bisexual. Perianth small, globose, woolly, 5-lobed. Stamens 5. Stigmas 2 or 3. Fruiting perianth depressed, not woody, with 3–5 tepaline processes forming a Y, inverted Y, or star-shaped configuration; processes flattened or subcylindrical, woolly, attached to length of perianth tube; radicular slit prominent. Pericarp membranous. Seed horizontal; radicle centrifugal; perisperm abundant, central.
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