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 Parthenocissus

Vitaceae

Parthenocissus

Copy permalink to share

(c) Conboy, Andrew - CC-BY
1 Leaves 3-lobed to 3-foliolate, no leaves 5-foliolate; trailing juvenile plants with 3-foliolate leaves towards the base and 1-foliolate leaves towards the tip of the shoot; [introduced ornamental, rarely escaped]
(c) Fleming, Gary P.
1 Leaves (3-) 5-7-foliolate, at least some leaves (on a plant with more than 5 nodes) 5-7-foliolate; trailing juvenile plants with 5-7-foliolate leaves towards the base and 3-foliolate (or rarely one or a few 1-foliolate leaves) towards the tip; [native].
(c) Roberts, Jo - CC-BY
  2 Larger leaves 7-foliolate; leaflets thick and fleshy in texture when fresh, 3-5 cm long; leaflets > 1.8× as long as wide; [of c. TX, barely entering our region on the western edge of e. TX]
(c) Fleming, Gary P.
  2 Larger leaves 5-foliolate; leaflets herbaceous in texture when fresh, 4-12 cm long; leaflets < 1.5× as long as wide; [collectively widespread in our area].
(c) Bradley, Keith
(c) Danielson, Erik
    3 Inflorescence with a well-developed (zigzag) central axis, the dichotomous branches very unequal, the inflorescence therefore paniculiform, with a total of 25-200+ flowers; tendrils with mostly 3-8 branches, most or all branches terminating with adhesive disks (though young shoots may not have the disks yet formed); leaves usually dull above, medium green; leaflets sessile, subsessile, or short-petiolulate (usually < 5 mm long); leaflet margins toothed primarily past the widest point, with few and obscure teeth below that point; berries 4-8 mm in diameter; [widespread in our area]
(c) Nonenmacher, Randy A - CC-BY
(c) Danielson, Erik
    3 Inflorescence without a well-developed central axis, the dichotomous branches relatively equal, the inflorescence therefore corymbiform, as wide or wider than long, with 2-3 main branches, with a total of 10-60 flowers; tendrils with mostly 3-5 branches, usually none terminating in adhesive disks (though sometimes swollen at the tip); leaves usually glossy above, often dark green; leaflets borne on long petiolules, often > 10 mm long; leaflet margins coarsely and jaggedly toothed, the teeth usually prominent in the lower half of each leaflet as well as the upper half; berries 6-12 mm in diameter; [from e. VA, n. WV northward, but also cultivated and spreading from horticultural use]