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Key to Passifloraceae

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1 Corona present, of several series of frills; stamens elevated on an androgynophore; herbaceous vine or woody liana
1 Corona absent; stamens not elevated on an androgynophore; upright herb

Key G2: woody plants with alternate, simple, palmately lobed leaves

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1 Lianas.
  2 Lianas climbing by adventitious roots
  2 Lianas climbing by twining or by tendrils.
    3 Lianas climbing by tendrils.
      4 Tendrils branched, leaf-opposed; leaves mostly 5-7-lobed, the margins also serrate or dentate
      4 Tendrils simple (though paired in Smilax in SMILACACEAE), axillary; leaves 3-lobed, the margins entire, serrulate, or prickly.
        5 Leaves longer than wide, entire or prickly-margined; stems usually obviously armed with prickles; flowers 6-merous, greenish, in umbels borne in leaf axils; tendrils stipular, 2 per leaf axil, adnate to the petiole basally
        5 Leaves wider than long, entire or serrulate; stems not armed; flowers 5-merous, blue-purple or yellow, solitary or in small fascicles in leaf axils; tendrils 1 per leaf axil
1 Trees or shrubs. {add: Vernicia in EUPHORBIACEAE, Firmiana in MALVACEAE, Kalopanax in ARALIACEAE, Ficus in MORACEAE}
             7 Leaves > 3 dm long and wide; tree monopodial, with a single, unbranched stem (rarely with a few branches).
               8 Leaf lobes > 15, not sublobed; venation of each lobe parallel; fruit a drupe, with 1 seed; [Monocots]
               8 Leaf lobes < 13, most of these sublobed; venation of each lobe pinnate; fruit either a many-seeded berry or a single-seeded nutlet; [Eudicots].
                 9 Petiole attachment marginal; leaf lobes mostly sublobed; fruit a large berry, with many seeds
                 9 Petiole attachment peltate; leaf lobes not sublobed; fruit an nutlet, single-seeded
             7 Leaves < 3 dm long and wide; tree branching; [Eudicots].
                   10 Leaves 2-lobed (deeply notched at the apex, each lobe separated by the midvein, asymmetrical; [peninsular FL and s. TX]
                   10 Leaves 3-5 (-7) lobed; [collectively widespread].
                     11 Leaf blades (3-) 5 (-7) lobed, to 15 cm wide and long, each lobe finely serrate-crenate (>3 teeth per cm of margin) and rarely with a small sub-lobe; multiple fruit spherical and spiky, consisting of multiple bird-beak-like loculicidal capsules; buds axillary
                     11 Leaves 3 (-5)-lobed, to 35 cm wide and long, each lobe coarsely toothed or sublobed, the teeth or sublobes (at most 1-2 per cm of margin) attenuate-acuminate; multiple fruit spherical and merely rough on the surface, consisting of multiple achenes with tawny bristles; buds infrapetiolar (completely hidden in the swollen petiole base)
                              15 Leaves 10-30 cm long and wide; fruit a berry; inflorescence of solitary to a few flowers, or a raceme
                              15 Leaves 2-10 cm long and wide; fruit an aggregate of drupelets; inflorescence a cyme

Key P2: herbaceous dicots with alternate, simple, and palmately lobed leaves on the stem

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1 Inflorescence an involucrate head subtended by phyllaries, the heads solitary or many and variously arrayed in secondary inflorescences, the ovary inferior, the corolla connate and tubular at least basally, the calyx absent, the stamens 5, the fruit a cypsela
1 Inflorescence, flower, and fruit structure various, but not with the combination of features as above (sometimes the flowers in a head, e.g. Eryngium in APIACEAE, but then with other features differing, such as stamens 4, or green calyx present, or fruit a schizocarp of mericarps, etc.).
  2 Plant a vine, climbing by tendrils or twining.
      4 Leaf margins entire; flowers bisexual; plants hermaphroditic; petals connate, large and showy
      4 Leaf margins serrate; flowers unisexual; plants dioecious; petals absent
    3 Vine climbing by tendrils.
        5 Ovary superior; petals distinct; flowers bisexual
  2 Plant an herb, sometimes sprawling, reclining (e.g. Cymbalaria in PLANTAGINACEAE, Aconitum in RANUNCULACEAE), but lacking climbing adaptations such as tendrils or twining stems.
             7 Involucre well-developed and obvious
          6 Ovary superior; inflorescence various, not an umbel; fruit various, a capsule, an aggregate of achenes or follicles, a ring of (>2) mericarps.
               8 Perianth uniseriate, the corolla absent (the calyx petaloid and white in Cnidoscolus); flowers unisexual; plants either with stinging hairs or not
               8 Perianth biseriate (uniseriate in Aphanes in ROSACEAE and in Trautvetteria in RANUNCULACEAE); flowers bisexual; plants lacking stinging hairs.
                 9 Pistils many (or 2-3 in Aphanes in ROSACEAE), each with 1 carpel, arranged spirally or in a ring (if in a ring, of 2-5); fruit an aggregate of achenes, follicles, or utricles.
                   10 Perianth bilaterally symmetrical, either hooded or spurred; fruit an aggregate of follicles
                   10 Perianth radially symmetrical, not hooded or spurred; fruit an aggregate of utricles or achenes (plumose achenes in Geum)
                     11 Stamens showy, bright white, dilated towards the tip; pistils ca. 15; fruit an aggregate of utricles
                     11 Stamens not showy, white, or dilated towards the tip; pistils many (> 25); fruit an aggregate of achenes.
                       12 Flowers with a prominent hypanthium; achenes with an elongate, plumose beak
                 9 Pistil 1, with 1-to many carpels (in many MALVACEAE, the carpels loosely united in a ring of more than 5 around the style); fruit a capsule, an achene, a follicle, or a ring of 3 or 5-many 1-seeded mericarps.
                            14 Corolla bilaterally symmetrical, the petals connate (except distinct in Delphinium in RANUNCULACEAE); fruit a capsule, a follicle, or a schizocarp of 3 1-seeded mericarps.
                              15 Corolla not spurred; fruit an elongate (10-20 cm) capsule with 2 curved beaks
                            14 Corolla radially symmetrical, the petals distinct (fused and tubular in Ipomoea); fruit a capsule or a schizocarp consisting of a ring of 5-many 1-seeded mericarps.
                                       19 Stamens many, connate into a stamen tube; carpels 5-many, completely or only loosely fused; fruit a capsule or a schizocarp of 5-many mericarps borne in a ring; calyx often subtended by an epicalyx (an additional calyx-like, green, foliaceous whorl of bracts)
                                       19 Stamens 5 or 10, distinct; carpels 2 or 5, fused; fruit a capsule or a schizocarp of 5 1-seeded mericarps.
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