1 Stems twining, usually climbing; leaf blades > 2× as long as wide, 5-7 mm wide; follicles 5-8× as long as wide, < 1 cm wide

1 Stems sprawling, not climbing (sometimes scandent on low vegetation); leaf blades 1-1.5× as long as wide, 1.5-3.5 cm wide; follicles 2-4× as long as wide.

  2 Corolla lobes glabrous on their upper (adaxial) surface.

    3 Corolla lobes 1-3 mm long, visibly faintly to strongly reticulate-veined; peduncles (20-) 40-73 mm long; [s. TX]

    3 Corolla lobes 2.5-4 mm long, not visibly reticulate-veined; peduncles 0-30 mm long; [c. and n. TX, OK]

  2 Corolla lobes hairy on their upper (adaxial surface), at least near the base of each lobe

      4 Corolla lobes hirtellous (short-hairy) towards the base, or rarely to nearly the tip; [s. TX]

      4 Corolla lobes pilose to hirsute (long-hairy) from base to nearly the tip; [either FL or c. and n. TX, OK.

        5 Inflorescences 1-2-flowered; corollas rotate-campanulate (the petal lobes spreading more-or-less in a plane), 3-6 mm long, 3-5× as long as the widest point, maroon or dark-brown on the upper surface; [c. and n. TX, OK]

1 Plant a twining herbaceous vine, with stems 1-2 m long at maturity; leaf blades 7-27 cm long; cymes borne on peduncles; flowers (2-) 9-19 (-53) per inflorescence, except M. alabamensis, with (1-) 4-5) (-12) flowers per inflorescence; upper (inner) surface of the petals glabrous; [various habitats, but more mesic, collectively widespread in our area].

  2 Inflorescence with 1-12 flowers, averaging 4-5; corolla light green, reticulated with darker green; corona disc-shaped, smooth or with obscure ridges (lacking 5 pairs of appendages); [mesic slopes of s. GA, Panhandle FL, and s. AL]

  2 Inflorescence with 2-53 flowers, averaging 9-19; corolla white, yellow, rose, or maroon (or greenish and reticulate in M. flavidula); corona cup-shaped, either 5-lobed (each with 4 teeth) (M. floridana), or 10-lobed with 5 short broad lobes alternating with 5 narrower 2-toothed lobes; [collectively widespread].

    3 Corona 5 lobed, each lobe with 4 teeth; corolla lobes ca. 5 mm long; [endemic to FL and sw. GA]

    3 Corona 10-lobed (5 short broad lobes alternating with 5 narrower 2-toothed lobes); corolla lobes 6-15 mm long; [collectively widespread].

      4 Corolla lobes in a horizontal plane or reflexed; flower buds ovoid to broadly conical, < 1.5× as long as wide; corolla lobes 1.5-5× as long as wide.

        5 Corolla dark maroon (rarely maroon-yellow or yellow), not reticulate with darker veins; paired corona appendages always higher than the alternating corona lobes

        5 Corolla green, green-yellow, or yellow (rarely rosy or olive-maroon), reticulate with darker green veins; paired corona appendages about as high as the alternating corona lobes

      4 Corolla lobes ascending; flower buds conical, > 2× as long as wide; corolla lobes 2.4-6.2× as long as wide.

          6 Corolla white (or fading or drying cream); corona 2.2-2.7 mm in diameter, cream or creamy-yellow; [Panhandle FL and sw. GA westward]

          6 Corolla rose or maroon (rarely cream); corona 2.6-4.0 mm in diameter, rose to dark maroon (rarely green, cream, or orange); [primarily Mountains and Piedmont].

             7 Corolla lobes 2.4-3.6 (-4.0)× as long as wide, the widest part above the sinus; corolla dark maroon

             7 Corolla lobes (3.2-) 4.0-6.2× as long as wide, the widest part at the sinus; corolla rose to light maroon (rarely dark maroon, green, or cream)