Plate 1 figs. a–h · 8 separate observations
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 3222674
- Filed as
- Hypericum walteri J.F.Gmel.
- Det. by
- Strong, Mark T., (BOT), Smithsonian Institution - National Museum of Natural History (UNITED STATES)
- Collected
- M. T. Strong & C. L. Kelloff 1991-09-02
- 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 21 botanical countries
| Region | TDWG code | Continent |
|---|---|---|
| Alabama | ALA | NORTHERN AMERICA |
| Arkansas | ARK | |
| Delaware | DEL | |
| Florida | FLA | |
| Georgia | GEO | |
| Illinois | ILL | |
| Indiana | INI | |
| Kentucky | KTY | |
| Louisiana | LOU | |
| Maryland | MRY | |
| Mississippi | MSI | |
| Missouri | MSO | |
| New Jersey | NWJ | |
| North Carolina | NCA | |
| Ohio | OHI | |
| Oklahoma | OKL | |
| South Carolina | SCA | |
| Tennessee | TEN | |
| Texas | TEX | |
| 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.
Where it actually grows measured, from 518 observations
| Condition | 5th percentile | Median | 95th percentile |
|---|---|---|---|
| Coldest month, mean daily low | -2.2 °C | 2.7 °C | 7.4 °C |
| Warmest month, mean daily high | 30.4 °C | 32.3 °C | 34.1 °C |
| Annual rainfall | 1,162 mm | 1,340 mm | 1,611 mm |
| Rainfall in the driest quarter | 218 mm | 269 mm | 330 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 518 research-grade observations of Hypericum walteri 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 23 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.
- Elodea axillaris Spach
- Elodea floribunda Spach
- Elodea petiolata Pursh
- Elodea petiolata Leconte ex Spach
- Elodea tubulosa Pursh
- Elodes axillaris Spach
- Elodes floribunda Spach
- Elodes petiolata Leconte ex Spach
- Elodes petiolata Raf.
- Elodes petiolata Pursh
- Elodes tubulosa Raf.
- Elodes tubulosa Pursh
- Hypericum axillare Michx.
- Hypericum leconteanum Steud.
- Hypericum paludosum Choisy
- Hypericum petiolatum Walter
- Hypericum tubulosum var. walteri (J.F.Gmel.) Lott
- Hypericum virginicum subsp. walteri (J.F.Gmel.) A.E.Murray
- Hypericum virginicum var. walteri (J.F.Gmel.) A.E.Murray
- Martia petiolata Spreng.
- Triadenum petiolatum Britton
- Triadenum tubulosum var. walteri (J.F.Gmel.) Cooperr.
- Triadenum walteri (J.F.Gmel.) Gleason
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.
- USDA PLANTS Database. common name, checklist symbol TRWA. public domain. 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.