Page author: Hattie Palmer
Spinulum annotinum
interrupted clubmoss, stiff clubmoss

Distribution: Alaska to Oregon, east to Montana and south in the Rockies to New Mexico; across Canada and in eastern United States from Maine to Virginia

Habitat: Moist forests, bog edges and rocky areas, lowlands to subalpine

Origin: Native

Growth Duration: Perennial

Conservation Status: Not of concern


Trailing perennial; stems creeping horizontally on substrate or subterranean; upright shoots clustered, mostly unbranched or weakly branched at base, 12-16 mm in diameter, annual bud constrictions abrupt and obvious; lateral branchlets few and same as upright shoots except annual bud constrictions absent; roots emerging from underside of stems.


Leaves spreading to bent backwards, dark green, linear-lanceolate, 5-8 mm long and 0.6-1.2 mm broad, margins finely dentate mostly towards apex, apex sharp-pointed, hair-tip absent.


Strobili solitary and sessile atop upright shoots, 15-30 mm long and 3.5-4.5 mm broad; sporangia reniform; spores reticulate, side at midsection convex.

Accepted Name:
Spinulum annotinum (L.) A. Haines

Synonyms & Misapplications:
Lycopodium annotinum L. [FNA2, HC]
Lycopodium annotinum L. var. pungens (Bach. Pyl.) Desv., invalidly published [Abrams]
Additional Resources:

PNW Herbaria: Specimen records of Spinulum annotinum in the Consortium of Pacific Northwest Herbaria database.

WA Flora Checklist: Spinulum annotinum checklist entry.

OregonFlora: Spinulum annotinum information.

E-Flora BC: Spinulum annotinum atlas page.

CalPhotos: Spinulum annotinum photos.

USDA Plants: Spinulum annotinum information.

26 photographs:
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