Erioneuron pilosum(Buckley) Nash

hairy woollygrass

WFO wfo-0000869197 Accepted WFO 2026-06 8 photographs CC0 / CC BY

Plate 1 figs. a–h · 8 separate observations

Erioneuron pilosum, photographed by Joel Dunnington MD
fig. a Joel Dunnington MD, CC BY 4.0 / 2022-05-06 / obs. 195977483
Erioneuron pilosum, photographed by Cecelia Alexander
fig. b Cecelia Alexander, CC0 1.0 / obs. 173951397
Erioneuron pilosum, photographed by Sam Kieschnick
fig. c Sam Kieschnick, CC BY 4.0 / obs. 122640957
Erioneuron pilosum, photographed by Eric Knight
fig. d Eric Knight, CC BY 4.0 / obs. 122614999
Erioneuron pilosum, photographed by Eric Knight
fig. e Eric Knight, CC BY 4.0 / obs. 64214867
Erioneuron pilosum, photographed by Craig Martin
fig. f Craig Martin, CC0 1.0 / obs. 103194869
Erioneuron pilosum, photographed by Cleveland Powell
fig. g Cleveland Powell, CC BY 4.0 / obs. 37181637
Erioneuron pilosum, photographed by Cleveland Powell
fig. h Cleveland Powell, CC BY 4.0 / obs. 16899366

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 16 botanical countries

Regions where Erioneuron pilosum is native: Arizona, California, Colorado, Kansas, Mexico Central, Mexico Northeast, Mexico Southwest, Nevada, New Mexico, Oklahoma, Texas, Utah, Argentina Northeast, Argentina Northwest, Argentina South, Bolivia ArizonaCaliforniaColoradoKansasMexico CentralMexico NortheastMexico SouthwestNevadaNew MexicoOklahomaTexasUtahArgentina NortheastArgentina NorthwestArgentina SouthBolivia
Native distribution of Erioneuron pilosum, 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
California CAL
Colorado COL
Kansas KAN
Mexico Central MXC
Mexico Northeast MXE
Mexico Southwest MXS
Nevada NEV
New Mexico NWM
Oklahoma OKL
Texas TEX
Utah UTA
Argentina Northeast AGE SOUTHERN AMERICA
Argentina Northwest AGW
Argentina South AGS
Bolivia BOL

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.

Where it actually grows measured, from 1,258 observations

Condition 5th percentile Median 95th percentile
Coldest month, mean daily low -1.3 °C 5.3 °C 6.6 °C
Warmest month, mean daily high 31.9 °C 33.9 °C 35.0 °C
Annual rainfall 396 mm 869 mm 1,006 mm
Rainfall in the driest quarter 45 mm 151 mm 181 mm

It is found where winters bring light frost. This is not care advice and it is not a forecast. It is a measurement: we sampled the climate at every one of the 1,258 research-grade observations of Erioneuron pilosum that carry a coordinate, and this is the range those places actually span. The 5th and 95th percentiles are used rather than the minimum and maximum, because a single cultivated specimen in a heated conservatory should not widen a tropical plant's range to the Arctic.

This is not a hardiness zone. A USDA zone is the average annual extreme minimum temperature. The figure above is the mean daily minimum of the coldest month, which is a different quantity and is typically far warmer. Reading one as the other would place a plant several zones too warm, so we do not publish a hardiness zone, because we do not have one.

Also published as 37 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.

  • Dasyochloa argentina (Kuntze) Caro
  • Dasyochloa argentina var. argentina
  • Dasyochloa argentina var. aristiglumis Caro
  • Dasyochloa argentina var. parodiana (E.A.Sánchez) Caro
  • Dasyochloa kurtziana (Parodi) Caro
  • Dasyochloa longiglumis (Parodi) Caro
  • Dasyochloa longiglumis var. longiglumis
  • Dasyochloa pygmaea (Parodi) Caro
  • Erioneuron avenaceum var. kurtzianum (Parodi) Anton
  • Erioneuron avenaceum var. longearistatum (Kurtz) Beetle
  • Erioneuron avenaceum var. longiaristatum (Kurtz) Beetle
  • Erioneuron avenaceum var. longiglume (Parodi) Anton
  • Erioneuron avenaceum var. pygmaeum (Parodi) Anton
  • Erioneuron pilosum var. argentinum (Kuntze) Nicora
  • Erioneuron pilosum var. aristiglume (Caro) E.A.Sánchez
  • Erioneuron pilosum var. aristiglumis (Caro) E.A.Sánchez
  • Erioneuron pilosum var. longiaristatum (Kurtz) Anton
  • Erioneuron pilosum var. mendocinum (Parodi) Nicora
  • Erioneuron pilosum var. parodianum E.A.Sánchez
  • Erioneuron pilosum var. pilosum
  • Sieglingia acuminata (Munro ex A.Gray) Kuntze
  • Sieglingia argentina Kuntze
  • Sieglingia pilosa (Buckley) Nash
  • Tricuspis acuminata Munro ex A.Gray

and 13 more.

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.