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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 Ammannia

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1 Midstem inflorescences of a solitary flower; peduncles 7-19 mm long, slender; petals 4-7 mm long; [s. TX southwards and westwards]
1 At least some midstem inflorescences simple or compound cymes of 3-15 flowers; peduncles 0-9 mm, slender to stout; petals 1-3 mm long; petals 0, 1, 4, 5, 6, or 8; [collectively widespread].
  2 Style included (when in fruit), thick, 0.5-1.0 mm long (much shorter than the ovary); calyx lobes obtuse, often with the apices minutely mucronate; petals 0, 1, or 4, pale pink to white, to 1 mm long and 1 mm wide
  2 Style exserted (when in fruit), filiform, 1.5-3.0 mm long (equal to or longer than the ovary); calyx lobes triangular, with acute apices; petals 4 (-5), deep rose-purple or pale lavender, ca. 2-3 mm long and 2-3 mm wide.
    3 Inflorescences sessile, with 1-3 (-5) flowers midstem; petals pale lavender; anthers light yellow; capsules 4-6 mm in diameter
    3 Inflorescences short- or long-pedunculate cymes, with (1-) 3-15 flowers midstem; petals deep rose-purple; anthers deep yellow; capsules (1-) 1.5-5 mm in diameter
      4 Peduncles slender; cymes (3-) 7-15-flowered; capsules (1.0-) 1.5-2.5 (-3.5) mm in diameter
      4 Peduncles stout; cymes (1-) 3-7 (-15)-flowered; capsules 3.5-5) mm in diameter
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