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Key to Passiflora

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1 Leaves either 2-lobed, or 3-lobed (and with the lobes of at least the larger leaves generally prominently sublobed), or unlobed (a few leaves sometimes with 1 or 2 small sublobes).
  2 Leaves (all on a plant) unlobed; floral bracts (subtending the calyx) ovate, either greatly expanded, to 60 mm long × 35 mm wide, or 1-2 mm long.
    3 Leaf margins coarsely crenate to doubly crenate; perianth bright red, the segments 30-50 mm long; ripe fruits green to yellow or orange, 40-60 mm long; [exotic, of disturbed areas]
    3 Leaf margins entire; perianth greenish-white to white, the segments 4-6 mm long; ripe fruits 5-8 mm long; [native, of rockland hammocks]
  2 Leaves (at least some on a plant; 2- or 3-lobed; floral bracts (subtending the calyx) absent or setaceous to subulate, to 6 mm long.
      4 Leaves regular and symmetrical in shape, with 2 lateral lobes primary (and the lobes never sublobed), the leaves almost always wider than long and "bat-winged"; corolla present (thus the perianth of 5 sepals and 5 petals); [FL peninsula].
        5 Sepals 13-17 mm long; leaf lower surfaces with conspicuous nectaries in 2 lines between the midvein and the lateral vein on either side; fruits 20-30 mm long; foliage glabrous or minutely puberulent
        5 Sepals 9-13 mm long; leaf lower surface lacking nectaries; fruits 5-10 mm long; foliage densely soft-hairy
      4 Leaves variable in shape and size on a plant, sometimes a mixture of unlobed, 3-lobed, and sometimes 2-lobed (if 2-lobed, the leaves asymmetrical); corolla absent (thus the perianth of 5 sepals only); [collectively FL and TX].
          6 Leaves unlobed, or 2- or 3-lobed (if 3-lobed, the lobes entire and not sublobed); side lobes of 2-lobed or 3-lobed leaves ascending, making a < 150 degree angle; [FL and s. TX]
          6 Leaves 3-lobed and the lobes of at least larger leaves sublobed; lateral lobes at an angle of about 180 degrees to one another; [e., c, and s. TX]
1 Leaves palmately 3-7 (-9)-lobed, the lobes relatively similar in size and shape.
             7 Leaf margins entire; ripe fruits blue, purple, or black, 5-15 mm long; perianth segments 3-16 mm long; floral bracts (subtending the calyx) 0-3 mm long, setaceous to subulate.
               8 Corolla absent (thus the perianth of 5 sepals only); fruit 5-13 mm long.
                 9 Leaves unlobed, or 2- or 3-lobed (if 3-lobed, the lobes entire and not sublobed); side lobes of 2-lobed or 3-lobed leaves ascending, making a < 150 degree angle; [FL and s. TX]
                 9 Leaves 3-lobed and the lobes of at least larger leaves sublobed; lateral lobes at an angle of about 180 degrees to one another; [e., c, and s. TX]
               8 Corolla present (thus the perianth of 5 sepals and 5 petals); fruit 8-15 mm long.
                   10 Sepals 10-16 mm long; petals 6-13 mm long; leaf sinuses (1/3-) ½-2/3 from lobe tip to leaf base; flora bracts (subtending the calyx) present (though sometimes deciduous), 1-3 mm long; outer corona filaments knob-tipped; [e. TX westward]
                   10 Sepals 6-10 mm long; petals 3-7 mm long; leaf sinuses ¼-1/2 from lobe tip to leaf base; floral bracts (subtending the calyx) absent; outer corona filaments narrowing to a pointed tip; [widespread]
             7 Leaf margins serrate, at least on the lateral leaf lobes near the petiole junction; ripe fruits green, yellow, yellow-orange, or red, 30-60 mm long; perianth segments 18-40 mm long; floral bracts (subtending the calyx) 3-30 mm long, ovate, sometimes pinnatifid-lobed.
                     11 Ripe fruits bright red; stipules pectinate; floral bracts (subtending the calyx) 20-30 mm long, pinnatifid
                     11 Ripe fruits green, green mottled with paler green, yellow, or yellow-orange; stipules setaceous, lanceolate or subreniform, entire or merely serrate; floral bracts (subtending the calyx) 3-30 mm long, entire or serrate.
                       12 Stipules subreniform, 5-14 mm wide.
                          13 Leaf blades (3-) 5-7 (-9)-lobed, the sinuses > 3/4 of the way from lobe tip to leaf base; [exotic]
                          13 Leaf blades 3-lobed, the sinuses < ½ the way from lobe tip to leaf base; [native, s. FL]
                       12 Stipules either lanceolate, 5-15 mm wide, or setaceous, 0.5-1 mm wide.
                            14 Stipules lanceolate, 5-15 mm wide; perianth bright red, the segments 40-80 mm long; fruit 50-80 mm long
                            14 Stipules setaceous, 0.5-1 mm wide; perianth white, pinkish, lavender, or blue, the segments 18-35 mm long; fruit 30-60 mm long.
                              15 Stipules > 10 mm long; floral bracts > 17 mm long; [exotic]
                              15 Stipules 3-5 mm long; floral bracts (subtending the calyx) 3-8 mm long; [native, widespread]