Asplenium ruta-muraria Linnaeus var. lanceolum Christ. Common name: American Wall-rue. Phenology: May-Oct. Habitat: Moist to dry outcrops of calcareous sedimentary or metamorphic rocks, such as limestone, dolostone, or marble, at low to moderate elevations. Distribution: A. ruta-muraria is a circumboreal species of Europe, Asia, and North America; in North America it ranges as var. lanceolum from VT, s. ON and n. MI south to n. NJ, w. NC, nw. GA (Jones & Coile 1988), n. AL, TN, and AR (Peck 2011).

Origin/Endemic status: Native

Taxonomy Comments: Var. ohionis is very likely only a form. The relationship of North American A. ruta-muraria (here distinguished as var. lanceolum), a tetraploid, to the diploid and tetraploid taxa of the A. ruta-muraria complex present in Europe and e. Asia is uncertain. Given the prevalence of allopolyploidy in Asplenium and slight morphologic differences between American and European material, we prefer not to assume its identity to the European plants. In Europe A. ruta-muraria is an abundant plant of masonry, such as the defensive walls of towns and cities; it is very rarely seen on walls in North America, presumably because they are not old enough.

Synonymy ⓘ: = POWO; = Asplenium cryptolepis Fernald; = Asplenium ruta-muraria L. var. cryptolepis (Fernald) Wherry — Can, Il, NS, Va, WV; > Asplenium cryptolepis Fernald var. cryptolepis — F, Sf; > Asplenium cryptolepis Fernald var. ohionis Fernald — F, Sf; < Asplenium ruta-muraria L. — C, FNA2, K4, Mo1, NE, NY, Pa, RAB, S13, Tn, W; > Asplenium ruta-muraria L. var. cryptolepis (Fernald) Wherry — G, POWO; > Asplenium ruta-muraria L. var. lanceolum Christ — POWO; > Asplenium ruta-muraria L. var. ohionis (Fernald) Wherry — G. Basionym: Asplenium ruta-muraria L. var. lanceolum Christ 1903

Links to other floras: < Asplenium ruta-muraria - FNA2

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Heliophily ⓘ: 5