Scleranthus

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  S. annuus

  1a. Sepals acute at the apex [Fig. 568], spreading to erect in fruit, separate, with a narrow, white-scarious margin up to 0.1 mm wide [Fig. 568]; floral bracts equaling or exceeding than flowers
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  S. perennis

  1b. Sepals obtuse to rounded at apex, usually introrse in fruit and overlapping, with a broader white-scarious margin 0.3–0.5 mm wide; floral bracts mostly shorter than flowers

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