Flora of North America species comparison

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Woodsia obtusa subsp. occidentalis
Photo is of parent taxon

western cliff fern
Stems

short- to long-creeping, individual branches usually 3–5 mm diam.
Blade

finely cut, 2-pinnate-pinnatifid.
Spores

averaging 35–42 µm. 2n = 76.
Proximal

pinnules of lower pinnae usually deeply lobed or pinnatifid.

Woodsia obtusa subsp. occidentalis
Phenology Sporulating summer–fall.
Habitat Cliffs and rocky slopes (rarely terrestrial), found on a variety of substrates but mostly sandstone and granite
Elevation 200–500 m (700–1600 ft)
Distribution
from FNA
AR; KS; MO; OK; TX
[BONAP county map]
Discussion

Woodsia obtusa subsp. occidentalis hybridizes with subsp. obtusa sporadically throughout the region of sympatry; the hybrids are sterile triploids with malformed spores.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 2.
Parent taxa Dryopteridaceae > Woodsia > Woodsia obtusa
Sibling taxa
W. obtusa subsp. obtusa
Name authority Windham: Contr. Univ. Michigan Herb. 19: 56. (1993)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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