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Click the number at the start of a key lead to highlight both that lead and its corresponding lead. Click again to show only the two highlighted leads. Click a third time to return to the full key with the selected leads still highlighted.

Key to Symphyotrichum, Key B: perennial salt-marsh asters
[of subgenus Astropolium] (clone)

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1 Midstem leaves (1.0-) 1.5-2.7 mm wide; involucres 4.1-5.3 mm high; ray flowers 10-16; disc flowers (10-) 13-23; achenes 1.5-2.0 (-2.5) mm long; pappus 3.0-4.4 mm long; [of FL southward]
1 Midstem leaves (1.5-) 3-6 mm wide; involucres 6-9.5 (-11) mm high; ray flowers (12-) 17-25; disc flowers 25-45 (-54); achenes 2.8-4.0 (-4.5) mm long; pappus 5.0-6.1 mm long; [widespread in our area]
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