Kaliwatan sa tanom nga asparagos ang Phreatia cylindrostachya.^[1] Una ning gihulagway ni Schltr..^[2] Ang Phreatia cylindrostachya sakop sa kahenera nga Phreatia, ug kabanay nga Orchidaceae.^[1][3]

Kini nga matang hayop na sabwag sa:

• New Guinea (pulo)
• Kapupud-ang Solomon

Ang kaliwatan gibahinbahin ngadto sa matang nga nahiubos:^[1]

• P. c. cylindrostachya
• P. c. grandifolia

1. ↑ ^{1.0 1.1 1.2} Roskov Y., Kunze T., Orrell T., Abucay L., Paglinawan L., Culham A., Bailly N., Kirk P., Bourgoin T., Baillargeon G., Decock W., De Wever A., Didžiulis V. (ed) (2019). "Species 2000 & ITIS Catalogue of Life: 2019 Annual Checklist". Species 2000: Naturalis, Leiden, the Netherlands. ISSN 2405-884X. TaxonID: 43104796. Retrieved 2019-11-11. {{cite web}}: |author= has generic name (help)CS1 maint: multiple names: authors list (link)
2. ↑ Schltr. (1913) , In: Repert. Spec. Nov. Regni Veg. Beih. 1: 944
3. ↑ Govaerts R. (ed). For a full list of reviewers see: http://apps.kew.org/wcsp/compilersReviewers.do (2019). WCSP: World Checklist of Selected Plant Families (version Aug 2017). In: Species 2000 & ITIS Catalogue of Life, 2019 Annual Checklist (Roskov Y., Ower G., Orrell T., Nicolson D., Bailly N., Kirk P.M., Bourgoin T., DeWalt R.E., Decock W., Nieukerken E. van, Zarucchi J., Penev L., eds.). Digital resource at www.catalogueoflife.org/annual-checklist/2019. Species 2000: Naturalis, Leiden, the Netherlands. ISSN 2405-884X.