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Key to Amaryllidaceae

Amaryllidaceae

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1 Corona present (a fused tubular or flattened petaloid structure in the center of the flower, above the tepals).
  2 Filaments fused with the corona; corona very membranous in texture, distinctly thinner than the tepals; flowers white; [native, of riverine or tidal shores and marshes]; [tribe Hymenocallideae, subtribe Hymenocallidinae]
  2 Filaments not fused with the corona; corona membranous in texture, but similar to the tepals (in texture, though sometimes of a different color); flowers usually at least partly yellow or orange (sometimes purely white); [exotic, naturalized in primarily upland and disturbed habitats]; [tribe Narcisseae, subtribe Narcissinae]
1 Corona absent.
    3 Flowers red; stamens about 2-2.5× as long as the tepals; [tribe Lycoridae]
    3 Flowers white, yellow, copper, or white-pink; stamens shorter than or about as long as the tepals.
      4 Flowers yellow to copper.
        5 Tepals apiculate at the tip, especially the outer 3 tepals; scape hollow; [tribe Hippeastreae, subtribe Zephyranthinae]
        5 Tepals rounded at the tip; scape solid; [tribe Narcisseae, subtribe Narcissinae]
      4 Flowers white or white-pink.
          6 Tepals 0.4-2.5 cm long, white, with small green or yellow spots; [tribe Galantheae].
             7 Inner 3 tepals distinctly shorter and blunter than the outer 3 tepals, only the inner 3 with a green spot near the tip
             7 Inner 3 tepals and outer 3 tepals of similar size and shape, all 6 white with a green spot near the tip
          6 Tepals 3-16 cm long, white, white-pink, or pink.
               8 Tepals spreading, separate, the perianth rotate; inflorescence a several-flowered umbel terminating the stem; leaves arranged spirally; leaf margins finely toothed; [tribe Amaryllideae, subtribe Crininae]
               8 Tepals ascending, overlapping, the perianth tubular; inflorescence either of a single flower or a several-flowered umbel terminating the stem; leaves either arranged distichously or spirally; leaf margins smooth
                 9 Inflorescence a several-flowered umbel terminating the stem; leaves arranged spirally; [tribe Lycoridae]
                 9 inflorescence of a single flower; leaves arranged distichously; [tribe Hippeastreae, subtribe Zephyranthinae]