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Isotrema tomentosum (Sims) H. Huber. Woolly Dutchman's-pipe, Pipevine. Phen: May-Jun. Hab: Bottomland and riparian forests, stream and river banks, disturbed areas. Dist: S. IN, s. MO, and se. OK, south to sw. GA, Panhandle FL, and c. TX. Also cultivated horticulturally and persistent or spreading more widely around eastern North America. FNA also reports that it is escaped in VA.

Origin/Endemic status: Native

Synonymy : = K3, K4, Mi, NE, NY, Zhu et al (2019); = Aristolochia tomentosa Sims – Ar, C, F, Fl2, FNA3, G, GrPl, GW2, Il, K1, Mo2, NcTx, Ok, RAB, S, Tx, WH3; = Isotrema tomentosa – Tn, orthographic variant

Links to other floras: = Aristolochia tomentosa - FNA3

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Wetland Indicator Status:

  • Atlantic and Gulf Coastal Plain: FAC
  • Eastern Mountains and Piedmont: FAC
  • Great Plains: FAC
  • Midwest: FAC
  • Northcentral & Northeast: FAC

Heliophily : 5

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image of plant© Alan Cressler: Isotrema tomentosum, Paint Rock River, Jackson County, Alabama 2 by Alan Cressler source | Original Image ⭷
image of plant© Alan Cressler: Isotrema tomentosum, Paint Rock River, Jackson County, Alabama 1 by Alan Cressler source | Original Image ⭷
image of plant© Nathan Aaron | Original Image ⭷
image of plant© Joey Shaw source | Original Image ⭷
image of plant© Alan Cressler: aristolochia tomentosa, cahaba national wildlife refuge, bibb county, alabama 3 by Alan Cressler source | Original Image ⭷

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Horticultural Information

NCBG trait

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Height: 20-30 ft.

plant sale text: This species has a profusion of hairy, or tomentose, heart-shaped leaves and has potential for use as a screening or shade providing plant when grown on a trellis or arbor. Like Isotrema macrophylla, woolly dutchmans pipe is a host for pipevine swallowtail larvae, making it a prime choice for the butterfly garden. The growth may be kept in check, if desired, by occasional pruning and shaping.

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native range: eastern & central U.S.