Hedeoma drummondii (Drummond's false pennyroyal)

Plate 1 figs. a–h · 8 separate observations

Hedeoma drummondii, photographed by Alexandre Passos — fig. a Alexandre Passos, CC0 1.0 / 2021-09-14 / obs. 157369216

Hedeoma drummondii, photographed by Brian Dickerson — fig. b Brian Dickerson, CC0 1.0 / obs. 88731221

Hedeoma drummondii, photographed by Brian Finzel — fig. d Brian Finzel, CC BY-SA 4.0 / obs. 175775395

Hedeoma drummondii, photographed by Leticia Jiménez Hernández — fig. e Leticia Jiménez Hernández, CC BY-SA 4.0 / obs. 80944768

Hedeoma drummondii, photographed by Catherine C. Galley — fig. f Catherine C. Galley, CC BY 4.0 / obs. 85587769

Hedeoma drummondii, photographed by Cecelia Alexander — fig. g Cecelia Alexander, CC0 1.0 / obs. 50207201

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 Hedeoma drummondii, 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
Alabama	ALA	NORTHERN AMERICA
Arizona	ARI
California	CAL
Colorado	COL
Kansas	KAN
Mexico Northeast	MXE
Mexico Northwest	MXN
Montana	MNT
Nebraska	NEB
Nevada	NEV
New Mexico	NWM
North Dakota	NDA
Oklahoma	OKL
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 111 in flower of 143 examined

20%

77%

63%

95%

85%

94%

100%

Proportion of examined Hedeoma drummondii in flower, by month
Month	In flower	Examined	Share	95% interval
Jan	0	1	too few examined
Feb	0	2	too few examined
Mar	2	10	20%	6% to 51%
Apr	33	43	77%	62% to 87%
May	10	16	63%	39% to 82%
Jun	21	22	95%	78% to 99%
Jul	17	20	85%	64% to 95%
Aug	16	17	94%	73% to 99%
Sep	9	9	100%	70% to 100%
Oct	3	3	too few examined
Nov	0	0	too few examined
Dec	0	0	too few examined

Peak flowering in Sep. Each bar is the share of Hedeoma drummondii 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. 111 of 143 examined observations were in flower, every one of them research grade. The whisker on each bar is a 95% Wilson interval. 5 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 5 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.

Hedeoma camporum Rydb.
Hedeoma ciliata Nutt.
Hedeoma longiflora Rydb.
Hedeoma ovata A.Nelson
Hedeoma sancta Small

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.