An often difficult to see plant of well-drained wooded slopes, rocky slopes of oak woods, open woods, moist woods, rich woods, and only rarely in clearings. It particularly seems to favor drainage patterns on southwest to southeast facing slopes in oak-hickory forests or chestnut oak forest. Search areas on the slope where leaves collect as water drains down the slope. These areas may have lots of Carex pennsylvanica surrounding the water sink, but little to no Carex pennsylvanica directly within the drainage where the Aristolochia may be concentrated (New York Natural Heritage Program 2004). Mesic forest (FNA 1997). Moist or dry upland woods (Gleason & Cronquist 1991). Rich, often calcareous soils, woodlands and floodplains (Mitchell and Beal 1979). Rich, often calcareous woods (Fernald 1970).

Appalachian oak-hickory forest A hardwood forest that occurs on well-drained sites, usually on ridgetops, upper slopes, or south- and west-facing slopes. The soils are usually loams or sandy loams. This is a broadly defined forest community with several regional and edaphic variants. The dominant trees include red oak, white oak, and/or black oak. Mixed with the oaks, usually at lower densities, are pignut, shagbark, and/or sweet pignut hickory. Chestnut oak forest A hardwood forest that occurs on well-drained sites in glaciated portions of the Appalachians, and on the coastal plain. This forest is similar to the Allegheny oak forest; it is distinguished by fewer canopy dominants and a less diverse shrublayer and groundlayer flora. Dominant trees are typically chestnut oak and red oak. Limestone woodland* A woodland that occurs on shallow soils over limestone bedrock in non-alvar settings, and usually includes numerous rock outcrops. There are usually several codominant trees, although one species may become dominant in any one stand. * probable association but not confirmed

Oak-tulip tree forest* A hardwood forest that occurs on moist, well-drained sites in southeastern New York. The dominant trees include a mixture of five or more of the following: red oak, tulip tree, American beech, black birch, red maple, scarlet oak, black oak, and white oak. * probable association but not confirmed Rich mesophytic forest* A hardwood or mixed forest that resembles the mixed mesophytic forests of the Allegheny Plateau south of New York but is less diverse. It occurs on rich, fine-textured, well-drained soils that are favorable for the dominance of a wide variety of tree species. A canopy with a relatively large number of codominant trees characterizes this forest. Canopy codominants include five or more of the following species: red oak, red maple, white ash, American beech, sugar maple, black cherry, cucumber tree, and black birch. * probable association but not confirmed Successional old field* A meadow dominated by forbs and grasses that occurs on sites that have been cleared and plowed (for farming or development), and then abandoned or only occasionally mowed. * probable association but not confirmed

Sugar Maple (Acer saccharum) Garlic Mustard (Alliaria petiolata) Lyre-leaved Rockcress (Arabidopsis lyrata) Whorled Milkweed (Asclepias quadrifolia) (Aster divaricatus) Bellow-beaked Sedge (Carex albicans var. albicans) Slender Wood Sedge (Carex digitalis) Pennsylvania Sedge (Carex pensylvanica) Pignut Hickory (Carya glabra) Yellow Corydalis (Corydalis flavula)

Pink Corydalis (Corydalis sempervirens) Common Dittany (Cunila origanoides) Licorice Bedstraw (Galium circaezans) Hophornbeam (Ostrya virginiana) White Oak (Quercus alba) Chestnut Oak (Quercus montana) Red Oak (Quercus rubra) Black Oak (Quercus velutina) Rock Crowfoot (Ranunculus micranthus) Bluestem Goldenrod (Solidago caesia)