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Key to Centaurium

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1 Flowers pedicellate, the pedicels (1-) 3-5 (-11) mm long
1 Flowers sessile or nearly so (sometimes appearing stalked but with bracteal leaves immediately below the calyx).
  2 Plants with a persistent rosette; corolla lobes 4.5-8 mm long
  2 Plants lacking a persistent rosette; corolla lobes 2-4.5 mm long
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