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Click the number at the start of a key lead to highlight both that lead and its corresponding lead. Click again to show only the two highlighted leads. Click a third time to return to the full key with the selected leads still highlighted.

Key to Asclepias, Key E: milkweeds with milky sap, with petiolate, nonlinear leaves, in fruit (or sterile)

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1 Leaves subopposite
1 Leaves opposite (or apparently whorled in A. quadrifolia).
  2 Follicle pendant; seeds without a coma; [of swamp forests of SC and southward]
  2 Follicle erect; seeds with a coma; [collectively widespread].
    3 Leaf-bearing nodes 3-4, the upper and lower opposite, the middle with a whorl of 4 leaves
    3 Leaf-bearing nodes 3-many, all opposite.
      4 Follicle slightly to strongly muricate
      4 Follicle smooth.
        5 Lower leaf surface glabrous, or pubescent on the midrib only
          6 Leaves 1-3 cm wide; follicles 6-10 cm long
          6 Leaves 3-11 cm wide; follicles 12-14 cm long
        5 Lower leaf surface pubescent.
             7 Leaves lanceolate, 4-10× as long as wide.
               8 Leaves coriaceous, 3-10 cm long, 1.5-4.5 cm wide; [of dry upland situations]
               8 Leaves herbaceous, 6-15 cm long, 2-7 cm wide; [of moist to wetland situations].
                 9 Stems and leaves sparsely pubescent to glabrescent; leaves narrow, the base obtuse to truncate, the apex long-acuminate; plants usually much branched
                 9 Stems and leaves moderately to densely pubescent; leaves broader, the base rounded to subcordate, the apex acute to short-acuminate; plants usually relatively strict
             7 Leaves ovate to elliptic, 1.5-4× as long as wide.
                   10 Stem moderately to densely pubescent; plants 1.5-5 (-7) dm tall; [of xeric pinelands of the Coastal Plain of from NC to s. FL, west to OK, AR, and TX].
                     11 Stem and leaves densely tomentulose; leaves mucronate
                     11 Stem and leaves softly puberulent; leaves apiculate
                   10 Stem glabrous to pubescent in lines only; plants 2-12 dm tall; [collectively of various habitats throughout our area].
                       12 Lower leaf surface densely puberulent; [primarily of moist to wet habitats]
                       12 Lower leaf surface glabrous or slightly pubescent; [of moist or dry habitats].
                          13 Leaves 4-9 cm wide, acuminate at the apex
                          13 Leaves 1-6 cm wide, mostly obtuse at the apex.
                            14 Leaves with subcordate, truncate, or broadly rounded bases; [ne. FL to s. peninsular FL]
                            14 Leaves with cuneate or rounded bases; [widespread in our area, but not ne. FL and peninsular FL]