Marcgravia roraimae
Marcgravia roraimae, described by Gilg and Werdermann, is named for Mount Roraima and belongs to the tepui flora of the Venezuelan Guayana. It is barely recorded, with two georeferenced collections from Amazonas state and no checklist distribution, so its conditions are inferred from tepui-slope forest and the needs of the genus: cool-to-warm, very humid, shaded climbing.
Where it grows wild
Tepui-slope and upland forest of the Guiana Shield, climbing trunks and sandstone in humid shade. Like the rest of the genus it is a root-climbing hemiepiphytic vine with two shoot forms: juvenile climbing shoots press small shingle leaves flat to bark or rock, and only mature free-hanging shoots carry the larger leaves and the pendent umbel with nectar-cup bracts. Growers keep it in the juvenile shingling stage on a damp vertical surface.
The type locality on Roraima implies 1000-2000 m; the only georeferenced records sit near 530 m.
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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.