| Section 4 » Family Aristolochiaceae |
Show/Hide Synonym
| taxonName | relationship | relatedTaxonName | relatedTaxonRefText | relComments |
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| Isotrema macrophyllum | = | Aristolochia macrophylla | Gleason and Cronquist (1991) | | | Isotrema macrophyllum | = | Aristolochia macrophylla | Flora of North America (1993b, 1997, 2000, 2002a, 2002b, 2003a, 2004b, 2005, 2006a, 2006b, 2006c, 2007a, 2009, 2010) | | | Isotrema macrophyllum | = | Aristolochia macrophylla | Kartesz (1999) | | | Isotrema macrophyllum | = | Aristolochia macrophylla | | | | Isotrema macrophyllum | = | Aristolochia macrophylla | Radford, Ahles, and Bell (1968) | | | Isotrema macrophyllum | = | Aristolochia macrophylla | Small (1933, 1938) | | | Isotrema macrophyllum | = | Aristolochia macrophylla | Wofford (1989) | | | Isotrema macrophyllum | = | Aristolochia durior | Fernald (1950) | | | Isotrema macrophyllum | = | Aristolochia durior | Gleason (1952) | | | Isotrema macrophyllum | = | Isotrema macrophylla | | , orthographic variant | | Isotrema macrophyllum | = | Aristolochia sipho | | | | Source: Weakley's Flora |
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| Author | (Lamarck) C.F. Reed | |
| Distribution | Throughout the Mountains. Apparently no records from the Piedmont, except as escapes. Certainly present in all Mountain counties.
This is a southern Applachian species, found from southern PA to northwestern SC, northern GA, and northeastern AL.
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| Abundance | Fairly common to locally common over the Mountains. In some ranges with much higher pH soils, it can be a very common woody species. Least numerous in the far southwestern counties. | |
| Habitat | This is a classic Rich Cove Forest species, being found primarily on rich wooded slopes. It can be found on higher and drier slopes and ridges, but primarily where mafic rocks, such as amphibolite, underlie the site. |
| Phenology | Blooms in May and June; fruits in August and September. | |
| Identification | This is a very distinctive, high-climbing, deciduous woody vine. It has alternate, very large cordate leaves, with entire margins; length averages about 6 inches across and long. The namesake flowers are on stalks several inches long, being greenish to brown-maroon, and pipe-shaped, often 2 inches long. The flowers are followed by ribbed, cylindrical capsules to 2-3 inches long. Hardly anyone will need flowers or capsules to identify this species, especially as, where it occurs, it can sprawl over other vegetation or climb tens of feet into the higher canopy trees. In some cove forests, it may be the most obvious plant. As the common name of the butterfly implies, this is the main native hostplant for the Pipevine Swallowtail. | |
| Taxonomic Comments | Several recent references have placed this species in another genus, as Isotrema macrophyllum. Older references had the species named as Aristolochia durior and also as A. macrophylla.
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| Other Common Name(s) | Dutchman’s-pipe | |
| State Rank | S4 | |
| Global Rank | G5 | |
| State Status | | |
| US Status | | |
| USACE-agcp | | |
| USACE-emp | | |
