Nabalus trifoliolatusCass.

dwarf rattlesnakeroot

WFO wfo-0000002149 Accepted WFO 2026-06 8 photographs CC0 / CC BY / CC BY-SA

Plate 1 figs. a–h · 8 separate observations

Nabalus trifoliolatus, photographed by Étienne Lacroix-Carignan
fig. a Étienne Lacroix-Carignan, CC0 1.0 / 2021-08-29 / obs. 154261617
Nabalus trifoliolatus, photographed by Howard Williams
fig. b Howard Williams, CC BY-SA 4.0 / obs. 151472855
Nabalus trifoliolatus, photographed by Ian Manning
fig. c Ian Manning, CC BY 4.0 / obs. 149940918
Nabalus trifoliolatus, photographed by Louis Imbeau
fig. d Louis Imbeau, CC BY 4.0 / obs. 148438691
Nabalus trifoliolatus, photographed by Daniel Atha
fig. e Daniel Atha, CC0 1.0 / obs. 133009566
Nabalus trifoliolatus, photographed by Jamie Griffiths
fig. f Jamie Griffiths, CC BY 4.0 / obs. 127645342
Nabalus trifoliolatus, photographed by Bonnie Semmling
fig. g Bonnie Semmling, CC BY 4.0 / obs. 122633011
Nabalus trifoliolatus, photographed by Jacob Read
fig. h Jacob Read, CC0 1.0 / obs. 96421142

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 27 botanical countries

Regions where Nabalus trifoliolatus is native: Connecticut, Georgia, Indiana, Kentucky, Labrador, Maine, Maryland, Massachusetts, Michigan, New Brunswick, New Hampshire, New Jersey, New York, Newfoundland, North Carolina, Nova Scotia, Ohio, Ontario, Pennsylvania, Prince Edward I., Québec, Rhode I., South Carolina, Tennessee, Vermont, Virginia, West Virginia ConnecticutGeorgiaIndianaKentuckyLabradorMaineMarylandMassachusettsMichiganNew BrunswickNew HampshireNew JerseyNew YorkNewfoundlandNorth CarolinaNova ScotiaOhioOntarioPennsylvaniaPrince Edward I.QuébecSouth CarolinaTennesseeVermontVirginiaWest Virginia Rhode I.
Native distribution of Nabalus trifoliolatus, 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
Connecticut CNT NORTHERN AMERICA
Georgia GEO
Indiana INI
Kentucky KTY
Labrador LAB
Maine MAI
Maryland MRY
Massachusetts MAS
Michigan MIC
New Brunswick NBR
New Hampshire NWH
New Jersey NWJ
New York NWY
Newfoundland NFL
North Carolina NCA
Nova Scotia NSC
Ohio OHI
Ontario ONT
Pennsylvania PEN
Prince Edward I. PEI
Québec QUE
Rhode I. RHO
South Carolina SCA
Tennessee TEN
Vermont VER
Virginia VRG
West Virginia WVA

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 97 in flower of 175 examined

Peak flowering in Sep. Each bar is the share of Nabalus trifoliolatus 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. 97 of 175 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 13 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.

  • Nabalus nanus (Bigelow) DC.
  • Nabalus trifoliolatus var. dissectifolius Peck
  • Nabalus trifoliolatus var. nanus (Bigelow) Weakley
  • Nabalus trifoliolatus var. obovatus Burnham
  • Nabalus trifoliolatus var. trifoliolatus
  • Prenanthes alba var. nana Bigelow
  • Prenanthes nana Torr. ex DC.
  • Prenanthes nana (Bigelow) Torr.
  • Prenanthes serpentaria var. nana (Bigelow) A.Gray
  • Prenanthes trifoliolata (Cass.) Fernald
  • Prenanthes trifoliolata f. trifoliolata
  • Prenanthes trifoliolata var. nana (Bigelow) Fernald
  • Prenanthes trifoliolata var. trifoliolata

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. USDA PLANTS Database. common name, checklist symbol PRNA. public domain. 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.