Piloblephis rigida (wild pennyroyal)

Plate 1 figs. a–h · 8 separate observations

Piloblephis rigida, photographed by Leila Dasher — fig. a Leila Dasher, CC BY 4.0 / 2022-05-11 / obs. 197040877

Piloblephis rigida, photographed by Josiah Londerée — fig. b Josiah Londerée, CC BY 4.0 / obs. 190517913

Piloblephis rigida, photographed by Jay Horn — fig. d Jay Horn, CC BY 4.0 / obs. 186110334

Piloblephis rigida, photographed by gpete — fig. e gpete, CC BY 4.0 / obs. 178850207

Piloblephis rigida, photographed by Stephanie C — fig. f Stephanie C, CC0 1.0 / obs. 175339608

Piloblephis rigida, photographed by geosesarma — fig. g geosesarma, CC BY 4.0 / obs. 174600304

Piloblephis rigida, photographed by Neli Kanonerova — fig. h Neli Kanonerova, CC BY 4.0 / obs. 171209886

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 3 botanical countries

Native distribution of Piloblephis rigida, 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.

Region	TDWG code	Continent
Florida	FLA	NORTHERN AMERICA
Georgia	GEO
Bahamas	BAH	SOUTHERN AMERICA

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 554 in flower of 677 examined

83%

97%

95%

72%

20%

25%

38%

60%

66%

Proportion of examined Piloblephis rigida in flower, by month
Month	In flower	Examined	Share	95% interval
Jan	81	98	83%	74% to 89%
Feb	186	192	97%	93% to 99%
Mar	194	205	95%	91% to 97%
Apr	26	36	72%	56% to 84%
May	4	20	20%	8% to 42%
Jun	0	1	too few examined
Jul	1	5	20%	4% to 62%
Aug	0	5	0%	0% to 43%
Sep	4	16	25%	10% to 50%
Oct	8	21	38%	21% to 59%
Nov	15	25	60%	41% to 77%
Dec	35	53	66%	53% to 77%

Peak flowering in Feb. Each bar is the share of Piloblephis rigida 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. 554 of 677 examined observations were in flower, every one of them research grade. The whisker on each bar is a 95% Wilson interval. One month has fewer than 5 examined observations, so no proportion is drawn for it. 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 4 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.

Clinopodium rigidum (W.Bartram ex Benth.) Kuntze
Piloblephis ericoides Raf.
Pycnothymus rigidus (W.Bartram ex Benth.) Small
Satureja rigida W.Bartram ex Benth.

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.