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..2 Leaves oblong-lanceolate, > 4× as long as wide; leaf apices acuminate |
..2 Leaves suborbicular, 1-1.5× as long as wide; leaf apices broadly rounded |
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....3 Leaves 3-foliolate. |
......4 Terminal leaflet sessile; fruit red, glandular-pubescent; foliage and stems lacking contact poisons |
......4 Terminal leaflet distinctly petiolulate; fruit white or greenish, glabrous or with scattered trichomes; foliage and stems containing contact poisons |
....3 Leaves pinnately compound, with (3-) 5-41 leaflets (at least the larger and better-developed on a plant with 5 or more leaflets). |
........5 Leaf rachis winged (with a flange of leaf tissue, often irregular in width and terminating at each leaflet attachment). |
..........6 Fruits glandular-pubescent; stamens 5; inflorescence a terminal panicle, the central axis upright as a continuation of the stem |
..........6 Fruits glabrous; stamens 10; inflorescence of axillary panicles, the central axis angled from the main stem |
........5 Leaf rachis not winged. |
............ 7 Inflorescence either a terminal panicle (the central axis stiff and upright) or of axillary or terminal clusters of short spikes |
............ 7 Inflorescence of axillary or cauliflorous panicles, the central axis lax and often dangling. |
............ ..8 Leaves all or mostly even-pinnate (sometimes some leaves with an apparently terminal or obliquely subterminal leaflet) |
............ ..8 Leaves odd-pinnate. |
............ ....9 Leaflets 19-41 per leaf, 2-5 cm long, 0.4-1 cm wide, averaging 5× as long as wide; leaflet margins often strongly serrate (to entire); [rare non-native in FL peninsula and s. TX] |
............ ....9 Leaflets 3-25 per leaf, 2.5-20 cm long, 1.5-8 cm wide, averaging 1.2-3× as long as wide; leaflet margins entire or shallowly crenate. |
............ ......10 Leaflet margin with obvious marginal vein; fruits 25-40 mm long; [rare non-native in s. FL] |
............ ......10 Leaflet margin lacking marginal vein (though sometimes thickened and translucent); fruits 4-20 mm long; [collectively widespread]. |
............ ........11 Upper surface of leaflets dull, matte; inflorescences from the trunk (cauliflorous) or axillary; fruits 2-3 mm long; foliage and stems lacking contact poisons; [rare non-native in s. FL] |
............ ........11 Upper surface of leaflets shiny, as if lacquered; inflorescences axillary near the summit of the stem; fruits 4-14 mm long; foliage and stems containing contact poisons. |
............ ..........12 Leaves 3-5 (-7)-foliolate; leaflet base rounded, subcordate, or cordate; leaflets 1.2-1.7× as long as wide; fruits orange or brown; [FL, Martin County southwards] |
............ ..........12 Leaves 7-13 (-15)-foliolate; leaflet base cuneate to rounded; leaflets 2-2.5× as long as wide; fruits white or yellowish; [widespread (though irregular) in our region, in FL south to Highlands County] |