[Spikeprimroses and Willowherbs of the Columbia River Gorge of Oregon and Washington]

Denseflower Spike Primrose, Dense-flower Willowherb, Dense Spike-primrose

Epilobium densiflorum

Synonyms: Boisduvalia densiflora, Boisduvalia densiflora var. densiflora, Boisduvalia densiflora var. pallescens, Boisduvalia densiflora var. salina

Inflorescence of Denseflower Spike Primrose, Dense-flower Willowherb, Dense Spike-primrose: Epilobium densiflorum (Synonyms: Boisduvalia densiflora, Boisduvalia densiflora var. densiflora, Boisduvalia densiflora var. pallescens, Boisduvalia densiflora var. salina)

A portion of the elongated inflorescence of denseflower spikeprimrose as seen in a vernal pond above Horsethief Butte to the east of the junction of US 197 and Washington Highway 14 in the eastern Columbia River Gorge....................July 10, 2009.

Denseflower Spike Primrose, Dense-flower Willowherb, Dense Spike-primrose: Epilobium densiflorum (Synonyms: Boisduvalia densiflora, Boisduvalia densiflora var. densiflora, Boisduvalia densiflora var. pallescens, Boisduvalia densiflora var. salina)

A portion of the elongated inflorescence of denseflower spikeprimrose as seen in a vernal pond above Horsethief Butte to the east of the junction of US 197 and Washington Highway 14 in the eastern Columbia River Gorge....................July 10, 2009.

Close-up of the inflorescence of a white-flowered form of Denseflower Spike Primrose, Dense-flower Willowherb, Dense Spike-primrose: Epilobium densiflorum (Synonyms: Boisduvalia densiflora, Boisduvalia densiflora var. densiflora, Boisduvalia densiflora var. pallescens, Boisduvalia densiflora var. salina) - Close-up of the inflorescence of a white-flowered form of Denseflower Spike Primrose, Dense-flower Willowherb, Dense Spike-primrose: Epilobium densiflorum (Synonyms: Boisduvalia densiflora, Boisduvalia densiflora var. densiflora, Boisduvalia densiflora var. pallescens, Boisduvalia densiflora var. salina) - Close-up of a pink-flowered inflorescence of Denseflower Spike Primrose, Dense-flower Willowherb, Dense Spike-primrose: Epilobium densiflorum (Synonyms: Boisduvalia densiflora, Boisduvalia densiflora var. densiflora, Boisduvalia densiflora var. pallescens, Boisduvalia densiflora var. salina)

Close-up of the inflorescence of a pink-flowered form of Denseflower Spike Primrose, Dense-flower Willowherb, Dense Spike-primrose: Epilobium densiflorum (Synonyms: Boisduvalia densiflora, Boisduvalia densiflora var. densiflora, Boisduvalia densiflora var. pallescens, Boisduvalia densiflora var. salina) - Denseflower Spike Primrose, Dense-flower Willowherb, Dense Spike-primrose: Epilobium densiflorum (Synonyms: Boisduvalia densiflora, Boisduvalia densiflora var. densiflora, Boisduvalia densiflora var. pallescens, Boisduvalia densiflora var. salina)

Denseflower spikeprimrose as seen in vernal swales along the Klickitat River approximately west of the old Soda Springs campground, Klickitat State Wildlife Recreation Area................July 21, 2011. The pink-flowered form is generally more common than the white-flowered form pictured here. Note also that the leaves are generally entire. The similar smooth willowherb (Epilobium pygmaeum) has denticulate or mintuely toothed leaves.

Paul Slichter