Agastache pallidiflora(A.Heller) Rydb.

Bill Williams Mountain giant hyssop

WFO wfo-0000904857 Accepted WFO 2026-06 8 photographs CC0 / CC BY / CC BY-SA

Plate 1 figs. a–h · 8 separate observations

Agastache pallidiflora, photographed by Andrew Tree
fig. a Andrew Tree, CC BY 4.0 / 2021-10-12 / obs. 163126884
Agastache pallidiflora, photographed by Andrew Tree
fig. b Andrew Tree, CC BY 4.0 / obs. 162710325
Agastache pallidiflora, photographed by Andrew Tree
fig. c Andrew Tree, CC BY 4.0 / obs. 162319491
Agastache pallidiflora, photographed by Cecelia Alexander
fig. d Cecelia Alexander, CC0 1.0 / obs. 158499079
Agastache pallidiflora, photographed by CK2AZ
fig. e CK2AZ, CC BY 4.0 / obs. 48518740
Agastache pallidiflora, photographed by weaver
fig. f weaver, CC BY-SA 4.0 / obs. 46873985
Agastache pallidiflora, photographed by Robbie Hannawacker
fig. g Robbie Hannawacker, CC0 1.0 / obs. 46131207
Agastache pallidiflora, photographed by CK2AZ
fig. h CK2AZ, CC BY 4.0 / obs. 45256412

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 Agastache pallidiflora is native: Arizona, Colorado, Mexico Northeast, New Mexico, Texas ArizonaColoradoMexico NortheastNew MexicoTexas
Native distribution of Agastache pallidiflora, 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
Arizona ARI NORTHERN AMERICA
Colorado COL
Mexico Northeast MXE
New Mexico NWM
Texas TEX

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 10 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.

  • Agastache breviflora var. havardii (A.Gray) Shinners
  • Agastache greenei (Briq.) Wooton & Standl.
  • Agastache neomexicana (Briq.) Standl.
  • Agastache pallidiflora subsp. havardii (A.Gray) Lint & Epling
  • Agastache pallidiflora subsp. typica Lint & Epling
  • Agastache pallidiflora var. neomexicana (Briq.) R.W.Sanders
  • Brittonastrum greenei Briq.
  • Brittonastrum neomexicanum Briq.
  • Brittonastrum pallidiflorum A.Heller
  • Cedronella breviflora var. harvardii A.Gray

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.