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Click the number at the start of a key lead to highlight both that lead and its corresponding lead. Click again to show only the two highlighted leads. Click a third time to return to the full key with the selected leads still highlighted.

Key to Ptelea

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1 Lower leaf surface and petiole densely to moderately pubescent throughout, usually more or less villous.
  2 Leaves with glands usually < 0.1 mm; leaves at maturity variable in size, relatively often large (terminal leaflets 8-12 cm long); sepals and petals usually eglandular or with inconspicuous glands (rarely with large glands); [widespread, especially Coastal Plain]
  2 Leaves with glands usually > 0.1 mm; leaves at maturity usually of moderate size (terminal leaflets 4-8.5 cm, rarely to 11.5 cm); conspicuous glands usually present on petals and sometimes on sepals; [of AR, OK, and TX westwards]
1 Lower leaf surface and petiole glabrous to sparsely pubescent.
    3 Leaves of moderate size, the terminal leaflets (3-) 4-9 (-10) cm, the lateral leaflets 2.3-7.7 cm; petioles 1.5-6.5 cm; terminal leaflets (2-) 2.4-3.2 (-3.9)× as long as wide; leaf glands usually at least partly > 0.1 mm; [of AR, OK, and TX westwards]
    3 Leaves variable in size but often large at maturity, the terminal leaflets 4-15 cm long, the lateral leaflets 3.8-11 cm long; petioles 3-12 cm; terminal leaflets (1.5-) 1.7-2.5 (-3.3)× as long as wide; leaf glands usually < 0.1 mm; [collectively widespread].
      4 Leaves small; terminal leaflets mostly 2.2-3.3× as long as wide, acute to acuminate at the apex; [of n. FL and peninsular FL]
      4 Leaves medium to large; terminal leaflets mostly 1.5-2.5× as long as wide; obtuse to rounded at the apex; [widespread]
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