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Key to Selenicereus
https://fsus.ncbg.unc.edu/main.php?pg=show-key.php&keyid=40274
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 | |
3 Stem spines 4.5-15 mm long, 6-18 per areole, bristlelike, eventually deciduous | |