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Key to Catopsis

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1 Leaves 8-15 cm long; inflorescence 3-10-flowered, pendent; petals yellow; flowering at night; floral bracts 14-15 mm long
1 Leaves 20-45 cm long; inflorescence 15-50-flowered, erect to pendent; petals white; flowering in the day; floral bracts 4-8 mm long.
  2 Leaves yellowish-green, covered with conspicuous, white, chalky powder toward the base, gradually narrowed towards the acute tip; floral bracts 6-8 mm long; sepals 9-12 mm long
  2 Leaves bright green, lacking chalky powder, abruptly narrowed above the dilated base to a long-attenuate tip; floral bracts 4-5 mm long; sepals 4-6 mm long