Poa infirmaKunth

weak bluegrass

WFO wfo-0000892617 Accepted WFO 2026-06 8 photographs CC0 / CC BY

Plate 1 figs. a–h · 8 separate observations

Poa infirma, photographed by Daniel Cahen
fig. a Daniel Cahen, CC BY 4.0 / 2022-03-26 / obs. 184676537
Poa infirma, photographed by Yves Bas
fig. b Yves Bas, CC BY 4.0 / obs. 184518212
Poa infirma, photographed by Piermario Maculan
fig. c Piermario Maculan, CC0 1.0 / obs. 184345843
Poa infirma, photographed by Daniel Cahen
fig. d Daniel Cahen, CC BY 4.0 / obs. 183025223
Poa infirma, photographed by Daniel Cahen
fig. e Daniel Cahen, CC BY 4.0 / obs. 182745705
Poa infirma, photographed by Piermario Maculan
fig. f Piermario Maculan, CC0 1.0 / obs. 177545154
Poa infirma, photographed by Jenny Saito
fig. g Jenny Saito, CC BY 4.0 / obs. 159732312
Poa infirma, photographed by Piermario Maculan
fig. h Piermario Maculan, CC0 1.0 / obs. 133195869

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 37 botanical countries

Regions where Poa infirma is native: Algeria, Canary Is., Egypt, Libya, Morocco, Tunisia, China North-Central, China South-Central, China Southeast, Cyprus, East Aegean Is., Iran, Iraq, Kuwait, Lebanon-Syria, Palestine, Tadzhikistan, Transcaucasus, Türkiye, East Himalaya, Myanmar, Pakistan, West Himalaya, Austria, Baleares, Bulgaria, Corse, France, Great Britain, Greece, Ireland, Italy, Kriti, Portugal, Sardegna, Spain, Türkiye-in-Europe AlgeriaEgyptLibyaMoroccoTunisiaChina North-CentralChina South-CentralChina SoutheastCyprusEast Aegean Is.IranIraqKuwaitLebanon-SyriaPalestineTadzhikistanTranscaucasusTürkiyeEast HimalayaMyanmarPakistanWest HimalayaAustriaBulgariaCorseFranceGreeceIrelandItalyKritiPortugalSpainTürkiye-in-Europe Canary Is.BalearesSardegna
Native distribution of Poa infirma, 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. Regions too small to draw at this scale are marked with a dot.
RegionTDWG codeContinent
Austria AUT EUROPE
Baleares BAL
Bulgaria BUL
Corse COR
France FRA
Great Britain GRB
Greece GRC
Ireland IRE
Italy ITA
Kriti KRI
Portugal POR
Sardegna SAR
Spain SPA
Türkiye-in-Europe TUE
China North-Central CHN ASIA-TEMPERATE
China South-Central CHC
China Southeast CHS
Cyprus CYP
East Aegean Is. EAI
Iran IRN
Iraq IRQ
Kuwait KUW
Lebanon-Syria LBS
Palestine PAL
Tadzhikistan TZK
Transcaucasus TCS
Türkiye TUR
Algeria ALG AFRICA
Canary Is. CNY
Egypt EGY
Libya LBY
Morocco MOR
Tunisia TUN
East Himalaya EHM ASIA-TROPICAL
Myanmar MYA
Pakistan PAK
West Himalaya WHM

Not drawn on the map: Great Britain. We hold no public-domain boundary for this region, so it is listed rather than guessed at.

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.

Flowering 31 in flower of 31 examined

Peak flowering in Mar. Each bar is the share of Poa infirma observations in which someone actually recorded the reproductive state and found the plant in flower, not the raw number of flowering records. That distinction matters: people observe plants far more in spring than in winter, so a bare count of flowering records partly measures when people go outside. Dividing by the number examined removes that. 31 of 31 examined observations were in flower, every one of them research grade. The whisker on each bar is a 95% Wilson interval. 10 months have fewer than 5 examined observations, so no proportion is drawn for them. This is still a global aggregate and not a forecast for your garden: the same species flowers on different dates in different hemispheres. Where a species has fewer than 30 flowering records we do not draw this chart at all. Computed from 10.15468/dl.cgje2x.

Also published as 17 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.

  • Catabrosa thomsonii Stapf
  • Colpodium thomsonii (Stapf) Hack.
  • Eragrostis infirma (Kunth) Steud.
  • Megastachya infirma (Kunth) Roem. & Schult.
  • Ochlopoa infirma (Kunth) H.Scholz
  • Ochlopoa perinconspicua (H.Scholz) H.Scholz
  • Poa annua Schltdl. & Cham.
  • Poa annua subsp. exilis (Tomm. ex Freyn.) Asch. & Graebn.
  • Poa annua var. exilis Tomm. ex Freyn.
  • Poa annua var. laxiflora Sennen
  • Poa annua var. plicata Sennen
  • Poa annua var. remotiflora Trab.
  • Poa annua var. tommasinii Asch. & Graebn.
  • Poa exilis (Tomm. ex Freyn.) Murb.
  • Poa inconspicua H.Scholz
  • Poa perinconspicua H.Scholz
  • Poa remotiflora (Hack. ex Trab.) Murb.

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.