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Key to Hymenopappus

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1 Basal leaves 2-pinnate, the ultimate lobes 0.5-6 mm wide; disc corolla tubes 1.5-2.2 mm long.
..2 Perennials; cauline leaves 0-4; heads 1-6 per stem
..2 Biennials; cauline leaves 8-50; heads 15-200 per stem.
....3 Lobes of basal leaves 1-6 mm wide; disc corollas yellowish; pappi 0.5-1.2 mm
....3 Lobes of basal leaves 0.5-1.5 mm wide; disc corollas whitish; pappi 1-2 mm.
......4 Stems about equally leafy throughout, the leaves not much reduced upwards; involucres finely tomentose throughout; corolla through funnelform; [xeric sands of the Carrizo Formation, Coastal Plain]
......4 Stems mostly leafy below, the leaves strongly reduced upwards; involucres variously pubescent to glabrate; [gravels, clays, and sands, mainly inland of the Coastal Plain]
1 Basal leaves simple or 1-2-pinnate, the ultimate lobes (1-) 5-30 mm wide; disc corolla tubes 2-3 mm long.
........5 Lower leaf surface glabrous or nearly so; pappus scales 0.1-0.2 mm long; [saline prairies in se. TX]
........5 Lower leaf surfaces densely velvety white-pubescent; pappus scales 0.1-2.0 mm long; [collectively more widespread].
..........6 Basal leaves simple or 1-pinnate; disc corollas usually purplish (rarely whitish); pappus scales 0.3-2.0 mm long; [sw. AR south to w. LA and e. TX].
............ 7 Cauline leaves (6-) 8016; phyllaries 6-12 mm long; corollas whitish to purplish; pappus scales 0.3-1 (1.5) mm long
............ 7 Cauline leaves 2-8, phyllaries 5-7 mm long; corollas yellowish to reddish; pappus scales 1.5-2.0 mm long
..........6 Basal leaves 1-2-pinnate; disc corollas whitish; pappus scales 0.1-1.0 mm long; [collectively more widespread].
............ ..8 Peduncles not subtended by bracts, or bracts not membranous, 3-5+ × 1-3+ mm; phyllaries whitish to yellowish, 5-9 × 2-4 mm; [NE, KS, OK, TX]
............ ..8 Peduncles usually subtended by ± membranous bracts 5-14 × 3-10 mm; phyllaries whitish, 7-15 × 4-8 mm; [SC, GA, FL, AL, MS, OK, AR, MO, IL, IN]
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