Lachnagrostis filiformis (New Zealand wind grass)

Plate 1 figs. a–h · 8 separate observations

Lachnagrostis filiformis, photographed by Kevin Faccenda — fig. a Kevin Faccenda, CC BY 4.0 / 2022-03-01 / obs. 182541819

Lachnagrostis filiformis, photographed by yatesy — fig. c yatesy, CC BY 4.0 / obs. 173150671

Lachnagrostis filiformis, photographed by Kym Nicolson — fig. d Kym Nicolson, CC BY 4.0 / obs. 174286059

Lachnagrostis filiformis, photographed by James K. Douch — fig. f James K. Douch, CC BY-SA 4.0 / obs. 167247355

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.

Flowering 31 in flower of 47 examined

86%

67%

57%

59%

Proportion of examined Lachnagrostis filiformis in flower, by month
Month	In flower	Examined	Share	95% interval
Jan	6	7	86%	49% to 97%
Feb	3	3	too few examined
Mar	0	1	too few examined
Apr	0	0	too few examined
May	1	1	too few examined
Jun	1	2	too few examined
Jul	0	0	too few examined
Aug	0	1	too few examined
Sep	2	2	too few examined
Oct	4	6	67%	30% to 90%
Nov	4	7	57%	25% to 84%
Dec	10	17	59%	36% to 78%

Peak flowering in Jan. Each bar is the share of Lachnagrostis filiformis 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 47 examined observations were in flower, every one of them research grade. The whisker on each bar is a 95% Wilson interval. 8 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 34 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.

Agrostis avenacea J.F.Gmel.
Agrostis chamissonis (Trin.) Trin.
Agrostis debilis Poir.
Agrostis filiformis (G.Forst.) Biehler
Agrostis forsteri Rich. ex Roem. & Schult.
Agrostis lasiantha Phil.
Agrostis leonii Parodi
Agrostis ligulata Steud.
Agrostis novae-hollandiae P.Beauv.
Agrostis retrofracta Willd.
Agrostis solandri F.Muell.
Avena filiformis G.Forst.
Calamagrostis avenacea (J.F.Gmel.) W.R.B.Oliv.
Calamagrostis chamissonis (Trin.) Steud.
Calamagrostis filiformis (G.Forst.) Cockayne
Calamagrostis forsteri (Kunth) Steud.
Calamagrostis retrofracta (Willd.) Link ex Steud.
Calamagrostis willdenowii Steud.
Deyeuxia chamissonis (Trin.) Kunth
Deyeuxia filiformis (G.Forst.) Petrie
Deyeuxia filiformis var. aristata (Benth.) Domin
Deyeuxia filiformis var. laeviglumis (Benth.) Domin
Deyeuxia forsteri Kunth
Deyeuxia forsteri var. aristata Benth.

and 10 more.

Sourcesevery claim on this page

World Flora Online Plant List. accepted name, authority, classification. CC0. Retrieved 2026-07-12.
iNaturalist. photographs and flowering annotations, CC0 / CC BY / CC BY-SA only. per photograph. Retrieved 2026-06-27.
Wikidata. common name (P1843), joined on the World Flora Online identifier (P7715). CC0. Retrieved 2026-07-13.

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. It has no native range either: Kew's checklist does not cover this taxon.