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Key to Selenicereus

Cactaceae

Selenicereus

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1 Mature stems with (2-) 3 (-5) ribs; stems 4-7.5 cm in diameter; scales on fruit conspicuous, spreading, to 4 cm long.
1 Mature stems with 4-8 ribs; stems 0.8-5 cm in diameter; scales on fruit inconspicuous
  2 Areoles on ovary and flower tube lacking hairs.
  2 Areoles on ovary and flower tube bearing long, white, hairlike spines
    3 Stem spines 4.5-15 mm long, 6-18 per areole, bristlelike, eventually deciduous