Tetraneuris acaulis (stemless four-nerve daisy)

Plate 1 figs. a–h · 8 separate observations

Tetraneuris acaulis, photographed by Cecelia Alexander — fig. a Cecelia Alexander, CC0 1.0 / 2022-05-28 / obs. 201345728

Tetraneuris acaulis, photographed by Alexandre Passos — fig. c Alexandre Passos, CC0 1.0 / obs. 184877685

Tetraneuris acaulis, photographed by P Holroyd — fig. d P Holroyd, CC BY 4.0 / obs. 131189858

Tetraneuris acaulis, photographed by Cole Wolf — fig. e Cole Wolf, CC BY 4.0 / obs. 98281207

Tetraneuris acaulis, photographed by Brian Dickerson — fig. f Brian Dickerson, CC0 1.0 / obs. 74834384

Tetraneuris acaulis, photographed by Matt Berger — fig. g Matt Berger, CC BY 4.0 / obs. 71424263

Tetraneuris acaulis, photographed by Julien Tchilinguirian — fig. h Julien Tchilinguirian, CC BY 4.0 / obs. 47424986

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 17 botanical countries

Native distribution of Tetraneuris acaulis, 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.

Region	TDWG code	Continent
Alberta	ABT	NORTHERN AMERICA
Arizona	ARI
California	CAL
Colorado	COL
Idaho	IDA
Kansas	KAN
Montana	MNT
Nebraska	NEB
Nevada	NEV
New Mexico	NWM
North Dakota	NDA
Oklahoma	OKL
Saskatchewan	SAS
South Dakota	SDA
Texas	TEX
Utah	UTA
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.

Flowering 125 in flower of 151 examined

62%

77%

95%

93%

63%

100%

Proportion of examined Tetraneuris acaulis in flower, by month
Month	In flower	Examined	Share	95% interval
Jan	0	0	too few examined
Feb	0	0	too few examined
Mar	3	4	too few examined
Apr	8	13	62%	36% to 82%
May	44	57	77%	65% to 86%
Jun	41	43	95%	85% to 99%
Jul	13	14	93%	69% to 99%
Aug	5	8	63%	31% to 86%
Sep	2	2	too few examined
Oct	2	3	too few examined
Nov	7	7	100%	65% to 100%
Dec	0	0	too few examined

Peak flowering in Nov. Each bar is the share of Tetraneuris acaulis 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. 125 of 151 examined observations were in flower, every one of them research grade. The whisker on each bar is a 95% Wilson interval. 6 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 43 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.

Actinea acaulis Spreng.
Actinea acaulis A.Nelson
Actinea acaulis S.F.Blake
Actinea acaulis f. acaulis
Actinea acaulis f. arizonica (Greene) J.F.Macbr.
Actinea acaulis f. caespitosa (A.Nelson) J.F.Macbr.
Actinea acaulis subsp. acaulis
Actinea acaulis var. acaulis
Actinea acaulis var. arizonica (Greene) S.F.Blake
Actinea acaulis var. lanata J.F.Macbr.
Actinea arizonica A.Nelson
Actinea epunctata (A.Nelson) A.Nelson
Actinea lanigera Daniels
Actinea osterhoutii A.Nelson
Actinea simplex A.Nelson
Actinella acaulis (Pursh) Nutt.
Actinella acaulis var. acaulis
Actinella depressa var. pygmaea A.Gray
Actinella epunctata (A.Nelson) A.Nelson
Actinella lanata Nutt.
Actinella leptoclada A.Gray
Cephalophora acaulis DC.
Gaillardia acaulis Pursh
Hymenoxys acaulis (Pursh) K.F.Parker

and 19 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.
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.