Native Plants
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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
Plant Characteristics
Duration: PerennialHabit: Herb
Fruit Type: Capsule
Size Notes: Up to about 16 inches tall.
Bloom Information
Bloom Color: Pink , PurpleBloom Time: Jul , Aug , Sep
Distribution
USA: CA , ORNative Distribution: Del Norte, Co., CA to s.w. OR
Native Habitat: Sandy & rocky benches below 3000 ft.
Growing Conditions
Light Requirement: SunSoil 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) CalfloraWebref 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 PlantsFNA: Find Epilobium rigidum in the Flora of North America (if available)
Google: Search Google for Epilobium rigidum
Metadata
Record Modified: 2023-02-08Research By: TWC Staff