Parthenocissus quinquefolia, (L.) Planchon Parthenocissus inserta, (A. Kerner) Fritsch

1. P. quinquefolia (L.) Planchon View in CoL in A. & C. DC., Monogr. Phan. 5: 448 (1887).

Stems up to 30 m, climbing and trailing. Leaves digitate; leaflets (3—)5(—7), 5-10 cm, obovate-elliptical, coarsely and obtusely serrate, dull and somewhat glaucous beneath. Tendrils mostly with 5-8 branches, each of which develops, on touching a solid support, a terminal, adhesive disc. Flowers in terminal and leaf-opposed, more or less thyrsoid panicles with several lateral branches. Petals c. 3 mm, deflexed, green. Fruit c. 6 mm, globose, with 2-3 seeds. Formerly widely cultivated for ornament; now largely replaced in some countries by 2 and 3, but naturalized locally in C. Europe and Britain. [Au Br Ge He Ho.] (£. part of U.S.A.)

2. P. inserta (A. Kerner) Fritsch View in CoL , Exkursionsfl. Österr. ed. 3, 321, 789 (1922)

( P. inserens Hayek , P. vitacea (Knerr) A. S. Hitchc. , P. quinquefolia auct. eur. med., non (L.) Planchon).

Like 1 but leaflets more acutely serrate and shining green beneath; tendrils longer, with 3-5 branches, clinging by coiling or by swelling of the apex inside a crevice, but without adhesive disc; inflorescences all leaf-opposed, smaller, and with conspicuously dichotomous branching. Widely cultivated for ornament and frequently naturalized. [Au Cz Da Ga Ge Ho Hu It Ju Po Rm.] (S. Canada, N. & W. parts of U.S.A.)

Hybrids between 1 and 2 have been reported, and it is possible that some of the naturalized plants are hybrids.