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.

Click images to enlarge and show more photo credit.

Key to Ptelea

Rutaceae

Ptelea

Copy permalink to share

© Scott Ward
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]