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Key to Pomaria

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1 Shrubs, stems 1.5-6 dm long; fruits oblong-lanceolate (narrowly trapezoidal), the two sides straightish and parallel for most of their lengths; leaflets 3-5 pairs per pinna, moderately to densely tomentose on the upper surface; flowers 12-20 mm long
1 Perennial herbs, stems 0.5-3 (-5) dm long; fruits crescent-shaped, both sides strongly curved; leaflets 5-10 pairs per pinna, nearly glabrous to moderately strigose on the upper surface; flowers 6-10 mm long

Key to Fabaceae, Key F: herbaceous legumes with bipinnate leaves [subfamily Mimosoideae]

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1 Leaves with an odd number of pinnae (lateral pinnae paired, but an additional pinna present in a terminal position on the rachis); [Caesalpinoideae].
  2 Leaflets 0.9-1.6× as long as wide; terminal pinna with about 2× as many leaflet pairs (8-20) as the lateral pinnae (3-7)
  2 Leaflets 1.8-4× as long as wide; terminal pinna with about the same number of leaflet pairs as the lateral pinnae.
    3 Lower surfaces of leaflets eglandular
    3 Lower surfaces of leaflets densely glandular punctate, the glands orange when fresh and drying black
1 Leaves with an even number of pinnae (lateral pinnae paired).
      4 Coarse climbing or sprawling suffruticose herbs, the stems to 6 m long, and usually armed with retrorsely curved prickles; [Caesalpinoidaeae]
      4 Perennial herbs, less coarse; [Mimosoideae]
        5 Stamens > 10; [tribe Acacieae]
        5 Stamens 10 or fewer; [tribe Mimoseae].
          6 Petiole with 1-several glands; stems ascending to erect; flowers greenish-white
          6 Petiole without glands; stems prostrate to weakly arching; flowers pink-purple, yellow, or greenish-yellow.
             7 Flowers pink-purple; legume ribbed, the ribs with prickles
             7 Flowers yellow to greenish-yellow; legume not ribbed or prickly