Dendrobium amplum
Dendrobium amplum, still widely grown under the name Epigeneium amplum, is a creeping epiphyte or lithophyte from the monsoon forests of the eastern Himalaya to Indochina, with widely spaced single-leaved pseudobulbs and one large, glossy brownish flower per growth. It grows from about 500 to 2,100 m, so it wants intermediate to cool conditions with a clear cooler, drier winter, and it flowers mostly from October to December.
Where it grows wild
Grows on mossy trunks and on mossy limestone rocks in semi-deciduous and evergreen forest, where its long creeping rhizome wanders across bark or rock with pseudobulbs spaced along it. Moss cushions keep the roots moist in the monsoon, while the winter is drier and cooler.
About 500 to 2,100 m. Plants from the upper part of the range (Nepal, Sikkim, northern Yunnan) take distinctly cooler winters than those from lower Thai and Vietnamese sites.
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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 4.0 licence, unmodified.