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Key to Euploca

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1 Shrubs; [s. TX, southwards and westwards].
  2 Decumbent shrub from a thick, woody caudex; leaves 3-5 mm long, ovate-lanceolate, 3-5× as long as wide; flowers white with a yellow throat, the notches between the corolla lobes less than halfway to the flower center
  2 Upright shrub; leaves 10-30 mm long, linear and revolute, 7-12× as long as wide; flowers pale yellow, the notches between the corolla lobes ca. halfway to the flower center
1 Herbs; [widespread (including s. TX)].
    3 Leaves sessile or with a poorly differentiated petiole < 2 mm long; leaf blades 4-10× as long as wide.
      4 Corolla white with a yellow throat, the tube 4-6 mm long, the limb 3-6 mm in diameter; leaves 8-45 mm long, 6-12× as long as wide; annual herb; [WV, s. OH, s. IL, MO, and KS south to s. AL, LA, and s. TX]
      4 Corolla of uniform color, white or yellow, the tube 3-5 mm, the limb 7-10 mm wide; leaves 5-20 mm long, 4-6× as long as wide; perennial herb; [FL].
        5 Plant with erect to ascending stem and branches; corolla white or yellow; [FL]
        5 Plant with prostrate stem and branches; corolla yellow; [s. FL]
    3 Leaves with differentiated petioles 2-15 mm long; leaf blades 1.5-6× as long as wide.
          6 Corolla tube 1.5-3 mm long; corolla limb 2-4 mm in diameter, ascending at a 45 degree angle from the tube; corolla limb deeply cut, the notches extending > halfway to the flower center.
             7 Petioles 2-5 mm long; inflorescences with flowers well-spaced and some of them subtended with a foliose bract very similar in size and shape to the leaves
             7 Petioles 5-10 mm long; inflorescences with flowers tightly packed in 2 ranks, lacking foliose bracts
          6 Corolla tube 4-11 mm long; corolla limb 4-22 mm in diameter, spreading at a 90 degree angle from the tube; corolla limb shallowly to medium cut, the notch essentially absent (the corolla limb a pentagon) to less than halfway to the flower center.
               8 Corolla limb 4-12 mm in diameter, notched moderately deeply, a quarter to half way to the flower center; leaf blades 3-6× as long as wide; ovary and developing fruit 4-lobed, separating into 4 mericarps; style stout, 0.6-0.9 mm long
               8 Corolla limb 12-22 mm in diameter, the notch essentially absent to very shallow (less than a quarter way to the flower center; leaf blades 2-4× as long as wide; ovary and developing fruit 2-lobed, separating into 2 mericarps; style slender, 2.5-4 mm long.
                 9 Corolla limb 8-11 mm long; corolla limb 15-22 mm in diameter; corolla lobes rounded (sometimes apiculate)
                 9 Corolla limb 4-8 mm long; corolla limb 12-17 mm in diameter, the lobes acuminate