Paphiopedilum vietnamense
An endangered slipper orchid from the limestone hills of northern Vietnam, discovered in 1997 and placed in the Parvisepalum group with P. delenatii and P. malipoense. It grows on limestone at about 350–1,400 m, where summers are warm and wet and winters cool and drier. It needs shade, a free-draining mix with some lime, and a noticeably cooler, drier winter.
Where it grows wild
A lithophyte of the karst limestone hills of northern Vietnam, rooting into humus and moss in rock crevices and pockets of leaf litter under forest or scrub. The limestone habitat is inferred from the Parvisepalum group and the region's karst; the sources opened here do not describe the microhabitat directly.
Wikipedia gives 350–1,400 m. Herbarium records with elevations are from 475 m (Thái Nguyên) and 625–1,400 m (Cao Bằng).
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Profiles are drafts built from measured range and climate and from published sources; each section carries its own confidence in the app. Photo from Wikimedia Commons, used under its CC BY-SA 4.0 licence, unmodified.