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Bransford, W.D. and Dolphia

Epilobium rigidum

Epilobium rigidum Hausskn.

Stiff Willowherb, Siskiyou Rock Fringe

Onagraceae (Evening Primrose Family)

Synonym(s): Epilobium rigidum var. canescens

USDA Symbol: EPRI

USDA Native Status: L48 (N)

A clumped, mat-forming perennial, to 16 in. high, with creeping stems. These stems, with gray-felted, willow-like leaves, are smothered with pale pink or lavener flowers from mid- to late-summer.

This plant thrives in hot summers and wet winters.

From the Image Gallery

1 photo(s) available in the Image Gallery

Plant Characteristics

Duration: Perennial
Habit: Herb
Fruit Type: Capsule
Size Notes: Up to about 16 inches tall.

Bloom Information

Bloom Color: Pink , Purple
Bloom Time: Jul , Aug , Sep

Distribution

USA: CA , OR
Native Distribution: Del Norte, Co., CA to s.w. OR
Native Habitat: Sandy & rocky benches below 3000 ft.

Growing Conditions

Light Requirement: Sun
Soil Description: Sandy, nutrient-poor soils.
Conditions Comments: Requires hot summers and wet winters.

Propagation

Description: Propagate by seed.
Commercially Avail: yes

Web Reference

Webref 30 - Calflora (2018) Calflora
Webref 38 - Flora of North America (2019) Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA.
Webref 23 - Southwest Environmental Information Network (2009) SEINet - Arizona Chapter

Additional resources

USDA: Find Epilobium rigidum in USDA Plants
FNA: Find Epilobium rigidum in the Flora of North America (if available)
Google: Search Google for Epilobium rigidum

Metadata

Record Modified: 2023-02-08
Research By: TWC Staff

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