Mirabilis linearis(Pursh) Heimerl

narrowleaf four o'clock

WFO wfo-0001086691 Accepted WFO 2026-06 8 photographs CC BY

Plate 1 figs. a–h · 8 separate observations

Mirabilis linearis, photographed by Bobby McCabe
fig. a Bobby McCabe, CC BY 4.0 / 2021-10-05 / obs. 161874992

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 21 botanical countries

Regions where Mirabilis linearis is native: Alberta, Arizona, California, Colorado, Kansas, Manitoba, Mexico Northeast, Mexico Northwest, Minnesota, Missouri, Montana, Nebraska, Nevada, New Mexico, North Dakota, Oklahoma, Saskatchewan, South Dakota, Texas, Utah, Wyoming AlbertaArizonaCaliforniaColoradoKansasManitobaMexico NortheastMexico NorthwestMinnesotaMissouriMontanaNebraskaNevadaNew MexicoNorth DakotaOklahomaSaskatchewanSouth DakotaTexasUtahWyoming
Native distribution of Mirabilis linearis, 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
Alberta ABT NORTHERN AMERICA
Arizona ARI
California CAL
Colorado COL
Kansas KAN
Manitoba MAN
Mexico Northeast MXE
Mexico Northwest MXN
Minnesota MIN
Missouri MSO
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 54 in flower of 88 examined

Proportion of examined Mirabilis linearis in flower, by month
Month In flower Examined Share 95% interval
Jan 0 0 too few examined
Feb 0 0 too few examined
Mar 0 1 too few examined
Apr 2 2 too few examined
May 2 3 too few examined
Jun 3 6 50% 19% to 81%
Jul 13 19 68% 46% to 85%
Aug 9 23 39% 22% to 59%
Sep 18 25 72% 52% to 86%
Oct 7 9 78% 45% to 94%
Nov 0 0 too few examined
Dec 0 0 too few examined

Peak flowering in Oct. Each bar is the share of Mirabilis linearis 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. 54 of 88 examined observations were in flower, every one of them research grade. The whisker on each bar is a 95% Wilson interval. 7 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.

Where it actually grows measured, from 861 observations

Condition 5th percentile Median 95th percentile
Coldest month, mean daily low -11.3 °C -6.3 °C 4.0 °C
Warmest month, mean daily high 25.1 °C 30.0 °C 34.8 °C
Annual rainfall 246 mm 433 mm 934 mm
Rainfall in the driest quarter 30 mm 52 mm 163 mm

It is found where winters bring hard 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 861 research-grade observations of Mirabilis linearis 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. Climate from CHELSA V2.1 (Karger et al. 2017); occurrences from 10.15468/dl.cgje2x.

Also published as 13 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.

  • Mirabilis decumbens Daniels
  • Mirabilis diffusa (A.Heller) C.F.Reed
  • Mirabilis gausapoides (Standl.) Standl.
  • Mirabilis hirsuta var. linearis (Pursh) B.Boivin
  • Mirabilis linearis f. subhispida Heimerl
  • Mirabilis linearis var. linearis
  • Oxybaphus bodinii Holz.
  • Oxybaphus decipiens (Standl.) Standl.
  • Oxybaphus decumbens (Nutt.) Sweet
  • Oxybaphus gausapoides (Standl.) Standl.
  • Oxybaphus linearis (Pursh) B.L.Rob.
  • Oxybaphus linearis var. decipiens (Standl.) Kearney & Peebles
  • Oxybaphus linearis var. subhispida (Heimerl) Dayton

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.