Beckmannia syzigachne (American sloughgrass)

Plate 1 figs. a–h · 8 separate observations

Beckmannia syzigachne, photographed by Matt Lavin — fig. a Matt Lavin, CC BY 4.0 / 2021-09-17 / obs. 158766743

Beckmannia syzigachne, photographed by Aleksei Baushev — fig. b Aleksei Baushev, CC BY 4.0 / obs. 158436550

Beckmannia syzigachne, photographed by Oleg Kosterin — fig. c Oleg Kosterin, CC BY 4.0 / obs. 156953671

Beckmannia syzigachne, photographed by Ellyne Geurts — fig. d Ellyne Geurts, CC0 1.0 / obs. 163568461

Beckmannia syzigachne, photographed by Erin Springinotic — fig. e Erin Springinotic, CC0 1.0 / obs. 160376042

Beckmannia syzigachne, photographed by Repina Tatyana — fig. g Repina Tatyana, CC BY 4.0 / obs. 138280143

Beckmannia syzigachne, photographed by Zinogre — fig. h Zinogre, CC BY-SA 4.0 / obs. 121452441

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 69 botanical countries

Native distribution of Beckmannia syzigachne, 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
Alaska	ASK	NORTHERN AMERICA
Alberta	ABT
Arizona	ARI
British Columbia	BRC
California	CAL
Colorado	COL
Greenland	GNL
Idaho	IDA
Illinois	ILL
Iowa	IOW
Kansas	KAN
Maine	MAI
Manitoba	MAN
Minnesota	MIN
Missouri	MSO
Montana	MNT
Nebraska	NEB
Nevada	NEV
New Brunswick	NBR
New Mexico	NWM
New York	NWY
North Dakota	NDA
Northwest Territories	NWT
Nova Scotia	NSC
Nunavut	NUN
Ohio	OHI
Ontario	ONT
Oregon	ORE
Pennsylvania	PEN
Prince Edward I.	PEI
Québec	QUE
Saskatchewan	SAS
South Dakota	SDA
Utah	UTA
Washington	WAS
Wisconsin	WIS
Wyoming	WYO
Yukon	YUK
Altay	ALT	ASIA-TEMPERATE
Amur	AMU
Buryatiya	BRY
China North-Central	CHN
China South-Central	CHC
China Southeast	CHS
Chita	CTA
Inner Mongolia	CHI
Irkutsk	IRK
Japan	JAP
Kamchatka	KAM
Kazakhstan	KAZ
Khabarovsk	KHA
Kirgizstan	KGZ
Korea	KOR
Krasnoyarsk	KRA
Kuril Is.	KUR
Magadan	MAG
Manchuria	CHM
Mongolia	MON
Nansei-shoto	NNS
Primorye	PRM
Qinghai	CHQ
Sakhalin	SAK
Tibet	CHT
Transcaucasus	TCS
Tuva	TVA
West Siberia	WSB
Yakutiya	YAK
East European Russia	RUE	EUROPE
Northwest European Russia	RUW

Not drawn on the map: Kuril Is.. We hold no public-domain boundary for this region, so it is listed rather than guessed at.

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 53 in flower of 104 examined

77%

75%

64%

35%

10%

Proportion of examined Beckmannia syzigachne in flower, by month
Month	In flower	Examined	Share	95% interval
Jan	0	0	too few examined
Feb	0	1	too few examined
Mar	0	2	too few examined
Apr	1	1	too few examined
May	10	13	77%	50% to 92%
Jun	15	20	75%	53% to 89%
Jul	18	28	64%	46% to 79%
Aug	7	20	35%	18% to 57%
Sep	1	10	10%	2% to 40%
Oct	0	6	0%	0% to 39%
Nov	0	2	too few examined
Dec	1	1	too few examined

Peak flowering in May. Each bar is the share of Beckmannia syzigachne 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. 53 of 104 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 18 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.

Beckmannia baicalensis (Kuzn.) Hultén
Beckmannia eruciformis subsp. baicalensis (V.A.Kusn.) Koyama & Kawano
Beckmannia eruciformis subsp. baicalensis (Kuzn) Hultén
Beckmannia eruciformis subsp. baicalensis (Kuzn.) T.Koyama & Kawano
Beckmannia eruciformis subsp. syzigachne (Steud.) Breitung
Beckmannia eruciformis subsp. vaicalensis (V.A.Kusn.) Koyama & Kawano
Beckmannia eruciformis var. baicalensis Kuzn.
Beckmannia eruciformis var. uniflora Scribn. ex A.Gray
Beckmannia hirsutiflora (Roshev.) Prob.
Beckmannia syzigachne f. eriantha Kitag.
Beckmannia syzigachne subsp. baicalensis (V.A.Kusn.) Hultén
Beckmannia syzigachne subsp. baicalensis (Kuzn.) T.Koyama & Kawano
Beckmannia syzigachne subsp. hirsutiflora (Roshev.) Tzvelev
Beckmannia syzigachne subsp. syzigachne
Beckmannia syzigachne var. hirsutiflora Roshev.
Beckmannia syzigachne var. syzigachne
Beckmannia syzigachne var. uniflora (Scribn. ex A.Gray) B.Boivin
Panicum syzigachne Steud.

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.