Utricularia juncea (southern bladderwort)

Plate 1 figs. a–h · 8 separate observations

Utricularia juncea, photographed by Eric Knight — fig. a Eric Knight, CC BY 4.0 / 2021-10-02 / obs. 161605056

Utricularia juncea, photographed by Kim — fig. d Kim, CC BY 4.0 / obs. 149691982

Utricularia juncea, photographed by Lauren McLaurin — fig. f Lauren McLaurin, CC BY 4.0 / obs. 41389033

Utricularia juncea, photographed by Laura Clark — fig. h Laura Clark, CC BY 4.0 / obs. 9955469

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 30 botanical countries

Native distribution of Utricularia juncea, 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
Alabama	ALA	NORTHERN AMERICA
Delaware	DEL
Florida	FLA
Georgia	GEO
Louisiana	LOU
Maryland	MRY
Mexico Gulf	MXG
Mexico Southeast	MXT
Mississippi	MSI
New Jersey	NWJ
New York	NWY
North Carolina	NCA
South Carolina	SCA
Texas	TEX
Virginia	VRG
Belize	BLZ	SOUTHERN AMERICA
Brazil North	BZN
Brazil Northeast	BZE
Colombia	CLM
Cuba	CUB
Dominican Republic	DOM
French Guiana	FRG
Guatemala	GUA
Guyana	GUY
Honduras	HON
Nicaragua	NIC
Puerto Rico	PUE
Suriname	SUR
Trinidad-Tobago	TRT
Venezuela	VEN

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 106 in flower of 110 examined

100%

90%

89%

Proportion of examined Utricularia juncea in flower, by month
Month	In flower	Examined	Share	95% interval
Jan	1	1	too few examined
Feb	0	0	too few examined
Mar	4	4	too few examined
Apr	3	3	too few examined
May	1	1	too few examined
Jun	5	5	100%	57% to 100%
Jul	16	16	100%	81% to 100%
Aug	30	30	100%	89% to 100%
Sep	19	19	100%	83% to 100%
Oct	18	20	90%	70% to 97%
Nov	8	9	89%	56% to 98%
Dec	1	2	too few examined

Peak flowering in Jun. Each bar is the share of Utricularia juncea 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. 106 of 110 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.

Where it actually grows measured, from 512 observations

Condition	5th percentile	Median	95th percentile
Coldest month, mean daily low	-1.6 °C	7.2 °C	22.6 °C
Warmest month, mean daily high	29.5 °C	31.2 °C	33.7 °C
Annual rainfall	1,170 mm	1,543 mm	3,234 mm
Rainfall in the driest quarter	168 mm	275 mm	359 mm

It is found where winters bring light 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 512 research-grade observations of Utricularia juncea 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 14 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.

Personula grandiflora Raf.
Stomoisia juncea (Vahl) Barnhart
Stomoisia virgatula (Barnhart) Barnhart
Stomoisis juncea (Vahl) Barnhart
Utricularia angulosa Poir.
Utricularia cornuta var. michauxii M.Gómez ex Steyerm.
Utricularia juncea f. juncea
Utricularia juncea f. minima S.F.Blake
Utricularia juncea f. virgatula (Barnhart) Fernald
Utricularia personata Leconte ex Elliott
Utricularia sclerocarpa C.Wright
Utricularia simplex C.Wright
Utricularia stricta G.Mey.
Utricularia virgatula Barnhart

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.