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DescriptionPerennial herbs, often with a distinctive smell of valerian. Inflorescence a thyrse. Flowers bisexual or unisexual. Calyx developing in fruit into a pappus of 5-15 plumose awns. Corolla slightly saccate at base, with 5 lobes. Stamens 3. Fruit a flattened achene with 6 filiform ribs.