Triosteum aurantiacumE.P.Bicknell

orangefruit horse-gentian

WFO wfo-0001290748 Accepted WFO 2026-06 8 photographs CC0 / CC BY

Plate 1 figs. a–h · 8 separate observations

Triosteum aurantiacum, photographed by Chase Mathey
fig. a Chase Mathey, CC BY 4.0 / 2022-05-23 / obs. 200129240
Triosteum aurantiacum, photographed by Jason Swanson
fig. b Jason Swanson, CC0 1.0 / obs. 154278727
Triosteum aurantiacum, photographed by Ryan Sorrells
fig. c Ryan Sorrells, CC BY 4.0 / obs. 149490142
Triosteum aurantiacum, photographed by Reuven Martin
fig. d Reuven Martin, CC0 1.0 / obs. 145228127
Triosteum aurantiacum, photographed by Quinten Wiegersma
fig. e Quinten Wiegersma, CC BY 4.0 / obs. 128525308
Triosteum aurantiacum, photographed by John Abrams
fig. f John Abrams, CC BY 4.0 / obs. 122480516
Triosteum aurantiacum, photographed by Derek
fig. g Derek, CC BY 4.0 / obs. 102962111
Triosteum aurantiacum, photographed by Jason Swanson
fig. h Jason Swanson, CC0 1.0 / obs. 100964799

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 35 botanical countries

Regions where Triosteum aurantiacum is native: Arkansas, Connecticut, Delaware, District of Columbia, Georgia, Illinois, Indiana, Iowa, Kansas, Kentucky, Maine, Maryland, Massachusetts, Michigan, Minnesota, Missouri, Nebraska, New Brunswick, New Hampshire, New Jersey, New York, North Carolina, Nova Scotia, Ohio, Oklahoma, Ontario, Pennsylvania, Québec, Rhode I., South Carolina, Tennessee, Vermont, Virginia, West Virginia, Wisconsin ArkansasConnecticutGeorgiaIllinoisIndianaIowaKansasKentuckyMaineMarylandMassachusettsMichiganMinnesotaMissouriNebraskaNew BrunswickNew HampshireNew JerseyNew YorkNorth CarolinaNova ScotiaOhioOklahomaOntarioPennsylvaniaQuébecSouth CarolinaTennesseeVermontVirginiaWest VirginiaWisconsin DelawareDistrict of ColumbiaRhode I.
Native distribution of Triosteum aurantiacum, 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
Arkansas ARK NORTHERN AMERICA
Connecticut CNT
Delaware DEL
District of Columbia WDC
Georgia GEO
Illinois ILL
Indiana INI
Iowa IOW
Kansas KAN
Kentucky KTY
Maine MAI
Maryland MRY
Massachusetts MAS
Michigan MIC
Minnesota MIN
Missouri MSO
Nebraska NEB
New Brunswick NBR
New Hampshire NWH
New Jersey NWJ
New York NWY
North Carolina NCA
Nova Scotia NSC
Ohio OHI
Oklahoma OKL
Ontario ONT
Pennsylvania PEN
Québec QUE
Rhode I. RHO
South Carolina SCA
Tennessee TEN
Vermont VER
Virginia VRG
West Virginia WVA
Wisconsin WIS

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 93 in flower of 406 examined

Peak flowering in Apr. Each bar is the share of Triosteum aurantiacum 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. 93 of 406 examined observations were in flower, every one of them research grade. The whisker on each bar is a 95% Wilson interval. 4 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 5 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.

  • Triosteum aurantiacum var. aurantiacum
  • Triosteum illinoense Rydb.
  • Triosteum perfoliatum var. aurantiacum (E.P.Bicknell) Wiegand
  • Triosteum perfoliatum var. glaucescens (Wiegand) Wiegand
  • Triosteum perfoliatum var. illinoense Wiegand

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.