Polystichum lemmonii
Lemmon's holly fern, Shasta fern

Distribution: Occurring on both sides of the Cascades in the northern half of Washington, particularly common in the Wenatchee Mountains; southern British Columbia, northern Washington, disjunct in the Wallowa Mts., and in southwestern Oregon and northern California.

Habitat: Open, rocky slopes near timberline in the mountains, chiefly on serpentine.

Origin: Native

Conservation Status: Not of concern


Terrestrial perennials, stem decumbent to ascending, stolons not present.


Leaves monomorphic, erect, 1-3.5 dm; petiole up to 1/4 length of leaf, sparsely scaly; scales pale tan, abruptly decreasing in size distally; blade narrowly lanceolate, 2-pinnate, barely narrowed at base; pinnae ovate, overlapping, folded inward and turned horizontally, 0.5-2 cm; base truncate to oblique, acroscopic pinnules nearest base not enlarged; apex broadly acute; microscales narrowly lanceolate, with scarce projections, sparse, generally confined to costa of upper and lower surfaces; pinnules somewhat stalked, rounded, acroscopic appendage not well developed, margins entire to slightly toothed, apex rounded.


Indusia entire or weakly irregularly toothed; spores dark brown to somewhat black.

Accepted Name:
Polystichum lemmonii Underw.
Publication: Native Ferns ed. 6. 116. 1900. 1900.

Synonyms & Misapplications:
Polystichum mohrioides (Bory) C. Presl, misapplied [HC]
Polystichum mohrioides (Bory) C. Presl var. lemmonii (Underw.) Fernald [Peck]
Additional Resources:

PNW Herbaria: Specimen records of Polystichum lemmonii in the Consortium of Pacific Northwest Herbaria database.

WA Flora Checklist: Polystichum lemmonii checklist entry.

E-Flora BC: Polystichum lemmonii atlas page.

CalPhotos: Polystichum lemmonii photos.

USDA Plants: Polystichum lemmonii information.

32 photographs:
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