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Key to Asclepias

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https://fsus.ncbg.unc.edu/main.php?pg=show-key.php&keyid=40361

1 Sap clear; leaves alternate; corolla orange to yellow Key to Asclepias, Key A: milkweeds with clear sap and alternate leaves
1 Sap milky (the milkiness often difficult to show in A. verticillata, which has numerous, whorled, linear leaves); leaves strictly or primarily opposite, subopposite, or whorled; corolla orange, red, white, cream, green, pink, or purple.
2 Leaves linear, > 10× as long as wide Key to Asclepias, Key B: milkweeds with milky sap, with linear leaves opposite, subopposite, or whorled
2 Leaves lanceolate, ovate, or elliptic, 1-5 (-10)× as long as wide.
3 Leaves sessile, subsessile, or with petioles to 3 mm long Key to Asclepias, Key C: milkweeds with milky sap, with sessile, nonlinear leaves
3 Leaves with petioles (3-) 4-20 mm long.
4 Plants in flower Key to Asclepias, Key D: milkweeds with milky sap, with petiolate, nonlinear leaves, in flower
4 Plants in fruit or sterile Key to Asclepias, Key E: milkweeds with milky sap, with petiolate, nonlinear leaves, in fruit (or sterile)

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Key to Asclepias