Eriocaulon parkeri (estuary pipewort)

Plate 1 figs. a–h · 3 observations

This species has been photographed under an open licence only 3 times, so some figures below are different views of the same plant, taken on the same day, rather than different individuals. They are usually different parts of it: the leaf, the flower, the bark.

Eriocaulon parkeri, photographed by Étienne Léveillé-Bourret — fig. a Étienne Léveillé-Bourret, CC BY 4.0 / 2020-08-05 / obs. 104686958

Eriocaulon parkeri, photographed by Étienne Lacroix-Carignan — fig. c Étienne Lacroix-Carignan, CC0 1.0 / obs. 152386718

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 10 botanical countries

Native distribution of Eriocaulon parkeri, 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
Connecticut	CNT	NORTHERN AMERICA
Delaware	DEL
Maine	MAI
Maryland	MRY
Massachusetts	MAS
New Jersey	NWJ
New York	NWY
North Carolina	NCA
Québec	QUE
Virginia	VRG

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.

Where it actually grows measured, from 78 observations

Condition	5th percentile	Median	95th percentile
Coldest month, mean daily low	-16.4 °C	-15.9 °C	-1.4 °C
Warmest month, mean daily high	24.0 °C	24.9 °C	29.9 °C
Annual rainfall	1,097 mm	1,177 mm	1,293 mm
Rainfall in the driest quarter	214 mm	230 mm	265 mm

It is found where winters are severely cold. This is not care advice and it is not a forecast. It is a measurement: we sampled the climate at every one of the 78 research-grade observations of Eriocaulon parkeri 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.

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.

Eriocaulon pellucidum f. rollandii (J.Rousseau) Moldenke
Eriocaulon rollandii J.Rousseau
Eriocaulon septangulare f. rollandii (J.Rousseau) Lepage
Eriocaulon septangulare var. parkeri (B.L.Rob.) B.Boivin

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.