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Key to Gypsophila

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1 Calyx 9-17 mm long, urnlike in shape (constricted upwards), with 5 prominent winged ridges with a cordlike marginal vein
1 Calyx 1-5 mm long, cuplike in shape (widening upwards), not winged.
..2 Inflorescence dense, subcapitate
..2 Inflorescence diffuse.
....3 Leaves 0.2-2 (-3) mm wide; stems diffusely and repeatedly branched near the base and upward
....3 Leaves (1-) 3-16 mm wide; stems simple, few-branched toward the top, or much-branched
......4 Perennial; plants much-branched 1-4 (-8) mm long
......4 Annual; plants strict or few branched upward; petals 6-15 mm long
........5 Stems glabrous below the inflorescence; [persistent from cultivation]
........5 Stems villous below the inflorescence; [historical waif]
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