Two new species of Plagiostachys from Zamboanga Peninsula, Philippines, are described and illustrated. Plagiostachys subsessiliflora Mazo and Plagiostachys longipetiolata Mazo, both have non-mucilaginous inflorescences. A distribution map, proposed conservation assessment, and an updated key to Philippine Plagiostachys species are provided.
Keyword: Alpinieae, IUCN, Plagiostachys escritorii, P. lourdesiae, P. strobilifera, taxonomy, Zamboanga
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