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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 Hedera

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1 Trichomes scale-like, 0.1-0.4 mm, reddish brown or white in color, those on the leaves, petioles, and young stems with rays fused basally for 1/4 to 1/2 their length; juvenile leaves lobed (at least slightly, as in H. algeriensis) or unlobed (H. colchica).
  2 Juvenile leaves lobed, fresh leaves not strong-scented when crushed; center of trichomes < 0.05 mm across
  2 Juvenile leaves orbicular and coriaceous, little or not at all lobed, strong-scented when crushed; center of trichomes > 0.05 mm across
1 Trichomes stellate, 0.5-1.0 mm, white in color, those on the leaves, petioles, and young stems with rays fused basally for < 1/8 their length; juvenile leaves slightly to deeply lobed.
    3 Hairs of young stems, leaves, and petioles whitish, the rays erect (at a right angle to the leaf surface); juvenile leaves usually < 8 cm wide, usually dark green and often also marbled with white, often lobed > ½ the way to the base; [often strongly climbing]
    3 Hairs of young stems, leaves, and petioles yellowish-brown to rusty-brown, the rays not erect (parallel to the leaf surface); juvenile leaves often > 8 cm wide, usually medium green (rarely also marbled with white), usually lobed < ½ the way to the base; [usually not climbing]
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