Asplenium arcanum
A small clump-forming spleenwort from western Mexico (Nayarit and Sinaloa) with one outlying collection from Nicaragua, with fronds 7–20 cm long on dark purple stalks. It grows on moist stream banks and wooded hillsides in a region with a summer rainy season and a long dry season. It is rarely cultivated, and care advice here is drawn mostly from its habitat and general spleenwort practice.
Where it grows wild
Stream banks and wooded hillsides in seasonally dry tropical forest, where the stream keeps the ground and air moist through the dry months. It forms compact clumps from an upright rhizome with fibrous roots.
About 200–700 m in western Mexico; the single Nicaraguan collection is from about 100–140 m in dry forest. The 6 measured records span 120–700 m, median 360 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.