Penstemon attenuatusDouglas

sulphur penstemon

WFO wfo-0001136958 Accepted WFO 2026-06 8 photographs CC0 / CC BY

Plate 1 figs. a–h · 5 observations

This species has been photographed under an open licence only 5 times, so some figures below are different views of the same plant, taken on the same day, rather than different individuals. They are usually different parts of it: the leaf, the flower, the bark.

Penstemon attenuatus, photographed by Cole Wolf
fig. a Cole Wolf, CC BY 4.0 / 2021-06-13 / obs. 136152891
Penstemon attenuatus, photographed by Nolan Exe
fig. b Nolan Exe, CC BY 4.0 / obs. 86841865
Penstemon attenuatus, photographed by Matt Lavin
fig. c Matt Lavin, CC BY 4.0 / obs. 178034354
Penstemon attenuatus, photographed by Matt Lavin
fig. d Matt Lavin, CC BY 4.0 / obs. 178034340
Penstemon attenuatus, photographed by Cole Wolf
fig. e Cole Wolf, CC BY 4.0 / obs. 136152899
Penstemon attenuatus, photographed by Nolan Exe
fig. f Nolan Exe, CC BY 4.0 / obs. 86841875
Penstemon attenuatus, photographed by Matt Lavin
fig. g Matt Lavin, CC BY 4.0 / obs. 178034357
Penstemon attenuatus, photographed by Patrick Sowers
fig. h Patrick Sowers, CC0 1.0 / obs. 41611319

Every figure is a research-grade observation under CC0, CC BY or CC BY-SA, rehosted with the photographer’s name, the licence and the observation it came from. Photographs under a NonCommercial licence are excluded from this site and are never stored, which costs us a great many pictures and is not negotiable.

Native range 5 botanical countries

Regions where Penstemon attenuatus is native: Idaho, Montana, Oregon, Washington, Wyoming IdahoMontanaOregonWashingtonWyoming
Native distribution of Penstemon attenuatus, after Kew’s World Checklist of Vascular Plants. Introduced, extinct and doubtful records are excluded, so this is where the plant is from, not everywhere it now grows.
RegionTDWG codeContinent
Idaho IDA NORTHERN AMERICA
Montana MNT
Oregon ORE
Washington WAS
Wyoming WYO

Region boundaries approximated from Natural Earth (public domain) and mapped to TDWG World Geographical Scheme for Recording Plant Distributions (WGSRPD) level-3 botanical countries (Brummitt 2001). Indicative, not the official WGSRPD geometry.

Also published as 21 synonyms

A synonym is not an error. It is a record of botanists disagreeing, in print, about where this plant belongs. Each of these was somebody’s considered answer.

  • Penstemon assurgens D.D.Keck
  • Penstemon attenuatus f. multicolor Pennell
  • Penstemon attenuatus subsp. attenuatus
  • Penstemon attenuatus subsp. hyacinthinus Pennell
  • Penstemon attenuatus subsp. militaris (Greene) D.D.Keck
  • Penstemon attenuatus subsp. palustris (Pennell) D.D.Keck
  • Penstemon attenuatus subsp. pseudoprocerus (Rydb.) D.D.Keck
  • Penstemon attenuatus subsp. typicus D.D.Keck
  • Penstemon attenuatus var. glabratus G.N.Jones
  • Penstemon attenuatus var. hyacinthinus (Pennell) M.Peck
  • Penstemon cephalanthus Pennell
  • Penstemon digitalis var. attenuatus (Douglas) Trautv.
  • Penstemon militaris Greene
  • Penstemon nelsoniae D.D.Keck & Thomps.
  • Penstemon owenii A.Nelson
  • Penstemon palustris Pennell
  • Penstemon procerus var. pseudoprocerus (Rydb.) A.Nelson
  • Penstemon propinquus Greene
  • Penstemon pseudohumilis Rydb.
  • Penstemon pseudoprocerus Rydb.
  • Penstemon veronicifolius Greene

Sourcesevery claim on this page

  1. World Flora Online Plant List. accepted name, authority, classification. CC0. Retrieved 2026-07-12.
  2. iNaturalist. photographs and flowering annotations, CC0 / CC BY / CC BY-SA only. per photograph. Retrieved 2026-06-27.
  3. Wikidata. common name (P1843), joined on the World Flora Online identifier (P7715). CC0. Retrieved 2026-07-13.
  4. Kew, World Checklist of Vascular Plants (WCVP v16). native distribution by TDWG level-3 botanical country, and life form. CC BY 3.0. Retrieved 2026-06-04.

We publish what we can source and we say so when we cannot. This page has no care advice and no toxicity claim, because we do not yet have those from a source we can cite.