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Key to Zanthoxylum

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1 Leaves even-pinnate, with (4-) 6-8 (-14) leaflets; [of s. FL]
1 Leaves odd-pinnate, with (3-) 5-13 leaflets; [collectively widespread in our area].
..2 Petioles and rachises winged; leaflets 1-5 (-7) cm long; [of peninsular FL and se. and s. TX southwards]
....3 Leaflets 1-3 cm long, rounded and usually retuse at the apex; [of peninsular FL and se. and s. TX southwards]
....3 Leaflets 2.5-5 (-7) sm long, acuminate to obtuse at the apex; [planted horticulturally, and sometimes persistent or weakly spreading]
..2 Petioles and rachises not winged; leaflets 4-10 cm long; [collectively widespread in our area].
......4 Twigs, leaves, and inflorescences stellate-canescent; plants without prickles; [of s. FL]
......4 Twigs, leaves, and inflorescences hirtellous, puberulent, or glabrous; twigs and leaves generally bearing prickles; [collectively widespread in our area].
........5 Leaflets 1-3.5 cm long; [of OK and TX]
........5 Leaflets 3.5-9 cm long; [collectively widespread in our area, including OK and TX].
..........6 Leaves thin in texture, pubescent; flowers and fruits borne in small axillary clusters; [mainly in inland physiographic provinces, but also rare and scattered in the Coastal Plain]
..........6 Leaves coriaceous in texture, glabrous and waxy, the lateral leaflets oblique at the base (asymmetrical across the midvein); flowers and fruits borne in large terminal and subterminal paniculate compound cymes; [mainly Coastal Plain, but extending northwards into inland provinces in n. AL, AR, OK, and TX]
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