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Key to Asclepias

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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 lanceolate, ovate, or elliptic, 1-5 (-10)× as long as wide.
    3 Leaves with petioles (3-) 4-20 mm long.
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