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Key to Orbexilum

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1 Leaves unifoliolate; [subgenus Poikadenia]
1 Leaves with 3-7 leaflets.
..2 Leaves palmately (3-) 5-7 foliolate, the leaflets linear to very narrowly oblanceolate, 2-7 cm long, 0.5-2.0 (-3.5) mm wide, > 10× as long as wide; [subgenus Orbexilum]
..2 Leaves pinnately 3 (-5) foliolate, the leaflets orbicular, ovate, elliptic or lanceolate, > 8 mm wide, 1-8× as long as wide.
....3 Leaflets 1.5-7 cm wide, 1-2.5× as long as wide; [subgenus Orbexilum].
......4 Upper leaf surfaces lacking glands; leaflets 3.7-5.5 cm long; [apparently endemic to Rock Island, Jefferson Co. KY and now considered extinct]
......4 Upper leaf surfaces glandular; leaflets 4-12 cm long.
........5 Leaflets subcordate, 4-7 cm wide, 1-1.5× as long as wide, glandular-punctate above and below, the apex obtuse; calyx stipitate-glandular; petals 8-10 mm long; [apparently endemic to Polk Co. NC, perhaps extinct]
........5 Leaflets rounded at base, 2-4 cm wide, 1.5-2.5× as long as wide, eglandular or sparsely glandular above, the apex acute; calyx lacking stipitate glands; petals 5-7 mm long; [widely scattered from w. VA and w. NC westward]
....3 Leaflets 0.8-2 cm wide, 2.5-7.5× as long as wide; [subgenus Poikadenia].
..........6 Flowers 8-10 mm long; [of s. AL westward]
..........6 Flowers 5-7 mm long; [collectively widespread in our area].
............ 7 Calyx tube, fruits, and bracts of the inflorescence eglandular (rarely slightly glandular-punctate); leaflets eglandular below (rarely slightly punctate); hairs on calyx 0.7-1.0 mm long; upper 2 calyx teeth 1.0-1.5 mm long, lateral teeth 1.5-2.0 mm long, lower calyx tooth 2.0-3.0 mm long; bracts narrowly ovate, 5-8 mm long, 1.0-2.5 mm wide
............ 7 Calyx tube, fruits, and bracts of the inflorescence conspicuously glandular-punctate; leaflets conspicuously glandular-punctate below; hairs on calyx 0.3-0.5 mm long; upper 2 calyx teeth 0.7-1.0 mm long, lateral teeth 1.2-1.5 mm long, lower calyx tooth 1.7-2.0 mm long; bracts broadly ovate, 6-10 mm long, 2- 5 mm wide

Key to Fabaceae, Key E: herbaceous legumes with palmate leaves with 4 or more leaflets [subfamily Faboideae]

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1 Leaflets 4; corolla yellow; [tribe Dalbergieae]
1 Leaflets 5 or more (at least on the largest and best developed leaves); corolla blue, pink, or violet (except yellow in Lupinus luteus).
..2 Leaflets and fruits not glandular-punctate; stamens monadelphous; [tribe Genisteae]
..2 Leaflets and fruits glandular-punctate; stamens diadelphous; [tribe Psoraleeae].
....3 Leaflets linear to very narrowly oblanceolate, 0.5-2.0 (-3.5) mm wide, > 10× as long as wide; [Coastal Plain]
....3 Leaflets broader, > 5 mm wide, 2-4.5× as long as wide; [collectively more widespread]
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