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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 Agave

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1 Inflorescence a spike; [subgenus Littaea]
1 Inflorescence a panicle; [subgenus Agave]
  2 Terminal leaf spine decurrent (the tough spine tissue extending down the margins of the leaf).
    3 Leaves entire or with marginal prickles towards the base of the leaf
    3 Leaves with stout marginal spines from base to tip.
      4 Leaves 10-20 dm long, 6-10× as long as wide; capsules 4-8 cm long
      4 Leaves 8-13.5 dm long, 4-6× as long as wide; capsules 3.5.4 cm long
  2 Terminal leaf spine truncate (the tough spine tissue ending abruptly, at essentially a right angle to the axis of the leaf).
        5 Leaves mostly recurved
        5 Leaves straight, erect to ascending
          6 Leaves entire or with few and weak marginal spines; marginal spines < 3 mm long and < 4 mm wide
          6 Leaves with marginal spines all along the margins; marginal spines > 3 mm long and to 8 mm wide
             7 Leaves variegated, or blue-green and glaucous
             7 Leaves bright green, not glaucous
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