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Boston-ivy, Japanese ivy, vigne vierge tricuspidée

Habit Lianas, high climbing.
Leaves

usually simple, sometimes palmately compound on older plants;

petiole usually longer than, sometimes ± equaling, blade;

blade lustrous adaxially, ovate to cordate-ovate or cordate-orbiculate, 4.5–17 × 4–16 cm, 3-lobed or leaflets 3, thin, herbaceous, base truncate to slightly cordate, margins crenate to crenate-serrate, apex acute to short-acuminate, surfaces glabrous or abaxial veins puberulent.

Inflorescences

± divergently branching, without distinct central axis.

Flowers

yellowish green.

Berries

globose, 5–8 mm diam. 2n = 40.

Tendrils

5–10-branched, with adhesive discs.

Parthenocissus tricuspidata

Phenology Flowering Jun–Jul; fruiting Sep–Oct.
Habitat Thickets, forest edges, disturbed places.
Elevation 50–500 m. (200–1600 ft.)
Distribution
from FNA
CT; DC; IA; IL; IN; KY; MA; ME; MO; NC; NE; NJ; NY; OH; PA; SC; TN; ON; e Asia [Introduced in North America]
[WildflowerSearch map]
[BONAP county map]
Discussion

Parthenocissus tricuspidata has escaped from cultivation and become locally naturalized throughout much of eastern North America.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Source FNA vol. 12, p. 16.
Parent taxa Vitaceae > Parthenocissus
Sibling taxa
P. heptaphylla, P. quinquefolia, P. vitacea
Synonyms Ampelopsis tricuspidata
Name authority (Siebold & Zuccarini) Planchon: in A. L. P. P. de Candolle and C. de Candolle, Monogr. Phan. 5: 452. (1887)
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