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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 Apiaceae

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1 Principal leaves either all simple (though sometimes palmately or pinnately lobed) or those that are basally disposed simple (those on the upper stem sometimes compound)
1 Principal leaves all variously compound (small bracteal leaves on the upper stem sometimes reduced and simple).
  2 Leaves 1-palmately or 1-pinnately compound (all leaflets attached to the summit of the petiole or to the primary inflorescence rachis).
    3 Leaves 1-palmately compound, all of the 3-7 leaflets attached to the summit of the petiole
  2 Leaves 2-5× compound, with 5-200+ leaf divisions, at least some attached to secondary or higher-order inflorescence axes.
      4 Leaves 2-4× pinnately or pinnately-ternately compound, the ultimate segments consisting of relatively few (usually < 25), discreet, typically broad (elliptic, ovate, or lanceolate) leaflets.
      4 Leaves 2-5× pinnately or pinnately-ternately decompound, the ultimate segments either linear and < 1 mm wide (and then either flat or angled in ×-section) or broader than 1 mm wide, but if broader then many (> 25) and often imperfectly separated from one another.
        5 Leaves 2-5× pinnately or pinnately-ternately decompound, the ultimate segments linear and < 1 mm wide (and then either flat or angled in ×-section)
        5 Leaves 2-5× pinnately or pinnately-ternately decompound, the ultimate segments broader than 1 mm wide, but if broader then many (> 25) and often imperfectly separated from one another
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