Gnaphalium uliginosumL.

Low cudweedMarsh cudweedmarsh cudweed

WFO wfo-0000075561 Accepted WFO 2026-06 8 photographs CC0 / CC BY

Plate 1 figs. a–h · 8 separate observations

Gnaphalium uliginosum, photographed by Pete Bradshaw
fig. a Pete Bradshaw, CC BY 4.0 / 2022-06-01 / obs. 202524493

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.

The specimen a real sheet, in a real collection

Herbarium
Smithsonian, US National Herbarium
Accession
US 3716556
Filed as
Gnaphalium uliginosum L.
Det. by
Meyer, E. M.; Haug, E.
Collected
E. M. Meyer & E. Haug 2014-07-21
Origin
US
The sheet
View the digitised specimen (CC0 1.0)

A real pressed plant, in a real collection, under the accession number above. Not an illustration of one. The holding institution does not serve this sheet’s image to third parties, so there is no photograph here. The record is real and the link goes to it. Where we hold no openly licensed sheet for a species this section is simply absent, and where a sheet never recorded who determined it, that field stays empty rather than being filled in. Roughly half of all herbarium sheets never recorded a determiner, which is ordinary.

Native range 104 botanical countries

Regions where Gnaphalium uliginosum is native: Algeria, Egypt, Altay, Amur, Buryatiya, China North-Central, Chita, Inner Mongolia, Irkutsk, Japan, Kazakhstan, Khabarovsk, Korea, Krasnoyarsk, Lebanon-Syria, Manchuria, Mongolia, Primorye, Tibet, Transcaucasus, Türkiye, West Siberia, Xinjiang, Yakutiya, New Guinea, Pakistan, West Himalaya, Albania, Austria, Baltic States, Belarus, Belgium, Bulgaria, Central European Russia, Corse, Czechia-Slovakia, Denmark, East European Russia, Finland, France, Germany, Great Britain, Greece, Hungary, Iceland, Ireland, Italy, Krym, Netherlands, North European Russia, Northwest European Russia, Norway, NW. Balkan Pen., Poland, Portugal, Romania, Sicilia, South European Russia, Spain, Sweden, Switzerland, Türkiye-in-Europe, Ukraine, Alaska, Alberta, British Columbia, Colorado, Connecticut, Delaware, Greenland, Idaho, Illinois, Iowa, Kansas, Kentucky, Maine, Manitoba, Maryland, Massachusetts, Minnesota, Montana, New Brunswick, New Hampshire, New Jersey, New York, Newfoundland, Nova Scotia, Ohio, Ontario, Oregon, Pennsylvania, Prince Edward I., Québec, Rhode I., Saskatchewan, South Dakota, Utah, Vermont, Virginia, Washington, West Virginia, Wisconsin, Wyoming, Yukon AlgeriaEgyptAltayAmurBuryatiyaChina North-CentralChitaInner MongoliaIrkutskJapanKazakhstanKhabarovskKrasnoyarskLebanon-SyriaManchuriaMongoliaPrimoryeTibetTranscaucasusTürkiyeWest SiberiaXinjiangYakutiyaNew GuineaPakistanWest HimalayaAlbaniaAustriaBaltic StatesBelarusBelgiumBulgariaCentral European RussiaCorseCzechia-SlovakiaDenmarkEast European RussiaFinlandFranceGermanyGreeceHungaryIcelandIrelandItalyKrymNetherlandsNorth European RussiaNorthwest European RussiaNorwayNW. Balkan Pen.PolandPortugalRomaniaSiciliaSouth European RussiaSpainSwedenSwitzerlandTürkiye-in-EuropeUkraineAlaskaAlbertaBritish ColumbiaColoradoConnecticutGreenlandIdahoIllinoisIowaKansasKentuckyMaineManitobaMarylandMassachusettsMinnesotaMontanaNew BrunswickNew HampshireNew JerseyNew YorkNewfoundlandNova ScotiaOhioOntarioOregonPennsylvaniaPrince Edward I.QuébecSaskatchewanSouth DakotaUtahVermontVirginiaWashingtonWest VirginiaWisconsinWyomingYukon KoreaDelawareRhode I.
Native distribution of Gnaphalium uliginosum, 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.
RegionTDWG codeContinent
Alaska ASK NORTHERN AMERICA
Alberta ABT
British Columbia BRC
Colorado COL
Connecticut CNT
Delaware DEL
Greenland GNL
Idaho IDA
Illinois ILL
Iowa IOW
Kansas KAN
Kentucky KTY
Maine MAI
Manitoba MAN
Maryland MRY
Massachusetts MAS
Minnesota MIN
Montana MNT
New Brunswick NBR
New Hampshire NWH
New Jersey NWJ
New York NWY
Newfoundland NFL
Nova Scotia NSC
Ohio OHI
Ontario ONT
Oregon ORE
Pennsylvania PEN
Prince Edward I. PEI
Québec QUE
Rhode I. RHO
Saskatchewan SAS
South Dakota SDA
Utah UTA
Vermont VER
Virginia VRG
Washington WAS
West Virginia WVA
Wisconsin WIS
Wyoming WYO
Yukon YUK
Albania ALB EUROPE
Austria AUT
Baltic States BLT
Belarus BLR
Belgium BGM
Bulgaria BUL
Central European Russia RUC
Corse COR
Czechia-Slovakia CZE
Denmark DEN
East European Russia RUE
Finland FIN
France FRA
Germany GER
Great Britain GRB
Greece GRC
Hungary HUN
Iceland ICE
Ireland IRE
Italy ITA
Krym KRY
Netherlands NET
North European Russia RUN
Northwest European Russia RUW
Norway NOR
NW. Balkan Pen. YUG
Poland POL
Portugal POR
Romania ROM
Sicilia SIC
South European Russia RUS
Spain SPA
Sweden SWE
Switzerland SWI
Türkiye-in-Europe TUE
Ukraine UKR
Altay ALT ASIA-TEMPERATE
Amur AMU
Buryatiya BRY
China North-Central CHN
Chita CTA
Inner Mongolia CHI
Irkutsk IRK
Japan JAP
Kazakhstan KAZ
Khabarovsk KHA
Korea KOR
Krasnoyarsk KRA
Lebanon-Syria LBS
Manchuria CHM
Mongolia MON
Primorye PRM
Tibet CHT
Transcaucasus TCS
Türkiye TUR
West Siberia WSB
Xinjiang CHX
Yakutiya YAK
New Guinea NWG ASIA-TROPICAL
Pakistan PAK
West Himalaya WHM
Algeria ALG AFRICA
Egypt EGY

Not drawn on the map: Great Britain. 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 169 in flower of 317 examined

Proportion of examined Gnaphalium uliginosum 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 0 too few examined
Apr 0 0 too few examined
May 2 4 too few examined
Jun 17 20 85% 64% to 95%
Jul 58 82 71% 60% to 79%
Aug 52 107 49% 39% to 58%
Sep 32 71 45% 34% to 57%
Oct 7 23 30% 16% to 51%
Nov 1 8 13% 2% to 47%
Dec 0 1 too few examined

Peak flowering in Jun. Each bar is the share of Gnaphalium uliginosum 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. 169 of 317 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 2,050 observations

Condition 5th percentile Median 95th percentile
Coldest month, mean daily low -17.6 °C -4.6 °C 3.7 °C
Warmest month, mean daily high 17.7 °C 22.4 °C 26.4 °C
Annual rainfall 545 mm 822 mm 1,836 mm
Rainfall in the driest quarter 70 mm 143 mm 300 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 2,050 research-grade observations of Gnaphalium uliginosum 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 21 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.

  • Dasyanthus uliginosus (L.) Bubani
  • Filaginella malzii Opiz
  • Filaginella uliginosa (L.) Opiz
  • Filaginella uliginosa subsp. uliginosa
  • Filago pilularis Link
  • Gnaphalium aquaticum Mill.
  • Gnaphalium castaneum Gilib.
  • Gnaphalium humifusum Paill. ex Nyman
  • Gnaphalium laevissimum Schur
  • Gnaphalium nudum Hoffm. ex J.F.Gmel.
  • Gnaphalium prostratum A.Huet ex Nyman
  • Gnaphalium ramosum Lam.
  • Gnaphalium tomentosum Hoffm.
  • Gnaphalium uliginosum f. condensatum Domin
  • Gnaphalium uliginosum f. uliginosum
  • Gnaphalium uliginosum subsp. nudum (Hoffm. ex J.F.Gmel.) Nyman
  • Gnaphalium uliginosum subsp. uliginosum
  • Gnaphalium uliginosum var. uliginosum
  • Gnaphalium uliginosum var. vaillantii Leredde
  • Gnaphalium wirtgenii Nyman
  • Gnaphalodes evacinum Sond.

Sourcesevery claim on this page

  1. World Flora Online Plant List. accepted name, authority, classification. CC0. Retrieved 2026-07-12.
  2. iNaturalist. photographs and flowering annotations, CC0 / CC BY / CC BY-SA only. per photograph. Retrieved 2026-06-27.
  3. Wikidata. common name (P1843), joined on the World Flora Online identifier (P7715). CC0. Retrieved 2026-07-13.
  4. 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.