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.
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.