Flowering-rush
Butomus umbellatus L.
Flowering-rush in all of Ohio
- Kingdom
- Plantae
- Phylum
- Tracheophyta
- Class
- Liliopsida
- Order
- Alismatales
- Family
- Butomaceae
- Genus
- Butomus
Introduced and invasive status
Invasive in Ohio: Ohio Department of Agriculture (opens in a new tab)
Also listed
- Introduced in Ohio: iNaturalist (opens in a new tab)
- Introduced and assessed as invasive in the lower 48 states
Ohio law lists it as an invasive plant: not native to Ohio, and causing, or likely to cause, economic, environmental or human health harm.
iNaturalist's volunteer curators list it as introduced in their Ohio checklist.
US-RIIS assesses a species as invasive when it causes, or is likely to cause, harm there, or is at least locally abundant and harmful ecologically, economically, or to health.
Status: Simpson A, Sellers E, Pagad S (2023). United States Register of Introduced and Invasive Species (US-RIIS), ver. 2.0. U.S. Geological Survey, https://doi.org/10.5066/P9KFFTOD (opens in a new tab)
Range
Where it is recorded
Season shown in 2 of Ohio's 88 counties. Explore Ohio
- No result yet (67)
- Recorded, too few records for a result (17)
- Recorded, season not shown (2)
- Season shown (2)
Counties as a table
| County | Records |
|---|---|
| Adams County | Recorded, too few records for a result |
| Allen County | No qualifying records yet |
| Ashland County | No qualifying records yet |
| Ashtabula County | Recorded, too few records for a result |
| Athens County | No qualifying records yet |
| Auglaize County | No qualifying records yet |
| Belmont County | No qualifying records yet |
| Brown County | No qualifying records yet |
| Butler County | No qualifying records yet |
| Carroll County | No qualifying records yet |
| Champaign County | No qualifying records yet |
| Clark County | No qualifying records yet |
| Clermont County | No qualifying records yet |
| Clinton County | No qualifying records yet |
| Columbiana County | No qualifying records yet |
| Coshocton County | No qualifying records yet |
| Crawford County | No qualifying records yet |
| Cuyahoga County | Recorded, too few records for a result |
| Darke County | No qualifying records yet |
| Defiance County | No qualifying records yet |
| Delaware County | Recorded, too few records for a result |
| Erie County | 32 · Season shown |
| Fairfield County | No qualifying records yet |
| Fayette County | No qualifying records yet |
| Franklin County | 26 · Recorded, season not shown |
| Fulton County | No qualifying records yet |
| Gallia County | No qualifying records yet |
| Geauga County | No qualifying records yet |
| Greene County | No qualifying records yet |
| Guernsey County | No qualifying records yet |
| Hamilton County | Recorded, too few records for a result |
| Hancock County | No qualifying records yet |
| Hardin County | Recorded, too few records for a result |
| Harrison County | No qualifying records yet |
| Henry County | No qualifying records yet |
| Highland County | No qualifying records yet |
| Hocking County | No qualifying records yet |
| Holmes County | No qualifying records yet |
| Huron County | No qualifying records yet |
| Jackson County | No qualifying records yet |
| Jefferson County | Recorded, too few records for a result |
| Knox County | No qualifying records yet |
| Lake County | Recorded, too few records for a result |
| Lawrence County | No qualifying records yet |
| Licking County | No qualifying records yet |
| Logan County | No qualifying records yet |
| Lorain County | No qualifying records yet |
| Lucas County | 60 · Recorded, season not shown |
| Madison County | No qualifying records yet |
| Mahoning County | Recorded, too few records for a result |
| Marion County | Recorded, too few records for a result |
| Medina County | No qualifying records yet |
| Meigs County | No qualifying records yet |
| Mercer County | No qualifying records yet |
| Miami County | No qualifying records yet |
| Monroe County | No qualifying records yet |
| Montgomery County | No qualifying records yet |
| Morgan County | No qualifying records yet |
| Morrow County | No qualifying records yet |
| Muskingum County | No qualifying records yet |
| Noble County | No qualifying records yet |
| Ottawa County | 46 · Season shown |
| Paulding County | No qualifying records yet |
| Perry County | No qualifying records yet |
| Pickaway County | Recorded, too few records for a result |
| Pike County | No qualifying records yet |
| Portage County | Recorded, too few records for a result |
| Preble County | No qualifying records yet |
| Putnam County | No qualifying records yet |
| Richland County | Recorded, too few records for a result |
| Ross County | No qualifying records yet |
| Sandusky County | Recorded, too few records for a result |
| Scioto County | No qualifying records yet |
| Seneca County | No qualifying records yet |
| Shelby County | No qualifying records yet |
| Stark County | No qualifying records yet |
| Summit County | Recorded, too few records for a result |
| Trumbull County | No qualifying records yet |
| Tuscarawas County | No qualifying records yet |
| Union County | No qualifying records yet |
| Van Wert County | No qualifying records yet |
| Vinton County | No qualifying records yet |
| Warren County | No qualifying records yet |
| Washington County | No qualifying records yet |
| Wayne County | No qualifying records yet |
| Williams County | No qualifying records yet |
| Wood County | Recorded, too few records for a result |
| Wyandot County | Recorded, too few records for a result |
No mapped range from the range source used, the USGS Gap Analysis Project, which maps land vertebrates only.
Season
When it is recorded
In Ottawa County
Late May to mid-October, middle week Jul 19–25
Records per week from 46 records in 9 of the 10 years from 2016 to 2025. Shows when people recorded it, not how common it is. The grey bars show how many records of all species were made here each week, so you can see when recording itself was high or low; the season is not adjusted by them.
Recorded on 42 dates. Latest record: September 2025.
Show as a table
| Week | Records of Flowering-rush | Years recorded | Records of all species |
|---|---|---|---|
| Jan 4–10 | 0 | 0 | 42 |
| Jan 11–17 | 0 | 0 | 40 |
| Jan 18–24 | 0 | 0 | 41 |
| Jan 25–31 | 0 | 0 | 14 |
| Feb 1–7 | 0 | 0 | 22 |
| Feb 8–14 | 0 | 0 | 22 |
| Feb 15–21 | 0 | 0 | 37 |
| Feb 22–28 | 0 | 0 | 78 |
| Mar 1–7 | 0 | 0 | 65 |
| Mar 8–14 | 0 | 0 | 41 |
| Mar 15–21 | 0 | 0 | 62 |
| Mar 22–28 | 0 | 0 | 79 |
| Mar 29 – Apr 4 | 0 | 0 | 79 |
| Apr 5–11 | 0 | 0 | 80 |
| Apr 12–18 | 0 | 0 | 189 |
| Apr 19–25 | 0 | 0 | 235 |
| Apr 26 – May 2 | 0 | 0 | 203 |
| May 3–9 | 0 | 0 | 557 |
| May 10–16 | 0 | 0 | 1,468 |
| May 17–23 | 0 | 0 | 1,043 |
| May 24–30 | 0 | 0 | 430 |
| May 31 – Jun 6 | 3 | 3 | 351 |
| Jun 7–13 | 2 | 2 | 223 |
| Jun 14–20 | 2 | 2 | 267 |
| Jun 21–27 | 6 | 4 | 463 |
| Jun 28 – Jul 4 | 1 | 1 | 405 |
| Jul 5–11 | 2 | 2 | 376 |
| Jul 12–18 | 3 | 3 | 448 |
| Jul 19–25 | 6 | 5 | 387 |
| Jul 26 – Aug 1 | 2 | 2 | 406 |
| Aug 2–8 | 1 | 1 | 430 |
| Aug 9–15 | 2 | 2 | 814 |
| Aug 16–22 | 3 | 2 | 447 |
| Aug 23–29 | 0 | 0 | 353 |
| Aug 30 – Sep 5 | 2 | 2 | 430 |
| Sep 6–12 | 1 | 1 | 406 |
| Sep 13–19 | 3 | 2 | 448 |
| Sep 20–26 | 3 | 2 | 366 |
| Sep 27 – Oct 3 | 0 | 0 | 274 |
| Oct 4–10 | 0 | 0 | 280 |
| Oct 11–17 | 4 | 1 | 169 |
| Oct 18–24 | 0 | 0 | 136 |
| Oct 25–31 | 0 | 0 | 105 |
| Nov 1–7 | 0 | 0 | 81 |
| Nov 8–14 | 0 | 0 | 136 |
| Nov 15–21 | 0 | 0 | 40 |
| Nov 22–28 | 0 | 0 | 53 |
| Nov 29 – Dec 5 | 0 | 0 | 51 |
| Dec 6–12 | 0 | 0 | 36 |
| Dec 13–19 | 0 | 0 | 31 |
| Dec 20–26 | 0 | 0 | 42 |
| Dec 27 – Jan 2 | 0 | 0 | 52 |
Reported in flower
Only 2 records here show flowers, too few to show a flowering season. One needs at least 20 records from 5 different years.
Reported in fruit
No records here show fruit yet, so there is no fruiting season to show. One needs at least 20 records from 5 different years.
In Ohio
Late May to mid-September, middle week Jul 26 – Aug 1
Records per week from 300 records in 10 of the 10 years from 2016 to 2025. Shows when people recorded it, not how common it is. The grey bars show how many records of all species were made here each week, so you can see when recording itself was high or low; the season is not adjusted by them.
Recorded on 240 dates. Latest record: September 2025.
Show as a table
| Week | Records of Flowering-rush | Years recorded | Records of all species |
|---|---|---|---|
| Jan 4–10 | 0 | 0 | 6,211 |
| Jan 11–17 | 0 | 0 | 5,146 |
| Jan 18–24 | 0 | 0 | 4,645 |
| Jan 25–31 | 0 | 0 | 4,698 |
| Feb 1–7 | 0 | 0 | 6,023 |
| Feb 8–14 | 0 | 0 | 5,888 |
| Feb 15–21 | 0 | 0 | 5,436 |
| Feb 22–28 | 0 | 0 | 6,846 |
| Mar 1–7 | 0 | 0 | 8,321 |
| Mar 8–14 | 0 | 0 | 10,384 |
| Mar 15–21 | 0 | 0 | 12,620 |
| Mar 22–28 | 1 | 1 | 13,949 |
| Mar 29 – Apr 4 | 0 | 0 | 19,661 |
| Apr 5–11 | 0 | 0 | 26,860 |
| Apr 12–18 | 0 | 0 | 39,925 |
| Apr 19–25 | 0 | 0 | 41,623 |
| Apr 26 – May 2 | 0 | 0 | 56,391 |
| May 3–9 | 0 | 0 | 52,952 |
| May 10–16 | 0 | 0 | 53,785 |
| May 17–23 | 2 | 1 | 57,698 |
| May 24–30 | 4 | 2 | 54,651 |
| May 31 – Jun 6 | 14 | 3 | 53,099 |
| Jun 7–13 | 18 | 9 | 53,700 |
| Jun 14–20 | 21 | 7 | 56,625 |
| Jun 21–27 | 14 | 6 | 55,361 |
| Jun 28 – Jul 4 | 17 | 6 | 58,477 |
| Jul 5–11 | 16 | 7 | 61,336 |
| Jul 12–18 | 14 | 7 | 64,722 |
| Jul 19–25 | 22 | 6 | 69,753 |
| Jul 26 – Aug 1 | 11 | 6 | 59,416 |
| Aug 2–8 | 15 | 6 | 59,712 |
| Aug 9–15 | 30 | 8 | 55,994 |
| Aug 16–22 | 22 | 7 | 54,328 |
| Aug 23–29 | 11 | 7 | 51,772 |
| Aug 30 – Sep 5 | 21 | 8 | 57,167 |
| Sep 6–12 | 12 | 4 | 59,075 |
| Sep 13–19 | 10 | 7 | 54,543 |
| Sep 20–26 | 10 | 5 | 45,860 |
| Sep 27 – Oct 3 | 5 | 4 | 43,180 |
| Oct 4–10 | 4 | 3 | 37,841 |
| Oct 11–17 | 5 | 1 | 30,824 |
| Oct 18–24 | 1 | 1 | 21,156 |
| Oct 25–31 | 0 | 0 | 19,021 |
| Nov 1–7 | 0 | 0 | 14,172 |
| Nov 8–14 | 0 | 0 | 12,621 |
| Nov 15–21 | 0 | 0 | 7,965 |
| Nov 22–28 | 0 | 0 | 8,136 |
| Nov 29 – Dec 5 | 0 | 0 | 6,083 |
| Dec 6–12 | 0 | 0 | 6,004 |
| Dec 13–19 | 0 | 0 | 5,423 |
| Dec 20–26 | 0 | 0 | 5,661 |
| Dec 27 – Jan 2 | 0 | 0 | 8,459 |
Reported in flower
Usually reported in flower late May to early September, middle week Jul 5–11.
From 28 records that show flowers. Not every photo of a plant in flower is marked as flowering, so this shows when people reported it in flower, not when it flowers.
Reported in fruit
Only 1 records here show fruit, too few to show a fruiting season. One needs at least 20 records from 5 different years.
What these results show
These results show when people recorded a species, not when or where it occurs. Missing weeks and low counts do not mean absence or scarcity, and counts are not abundance. Contributed records reflect where, when and what people chose to observe.
Identification
How to identify it
Months not reported
- Jan: no record
- Feb: no record
- Mar: recorded
- Apr: no record
- May: recorded
- Jun: recorded
- Jul: recorded
- Aug: recorded
- Sep: recorded
- Oct: recorded
- Nov: no record
- Dec: no record
Not reported in Ohio in April and November to February, 2016 to 2025.
Land cover where it is recorded
| Land cover | Its recordsAll Ohio records |
|---|---|
| Wetland | 41%5% |
| Developed | 38%49% |
| Farmland | 7%11% |
| Open water | 6%3% |
| Forest | 3%31% |
| Barren | 3%0.6% |
| Grassland and shrub | 2%0.9% |
From 193 records placed within 100 m, beside all Ohio records placed the same way. People record where they go, so this shows where records come from, not where the species lives. Land cover: USGS Annual NLCD, 2025 (opens in a new tab)
Sources
Where these results come from
- Records from iNaturalist research-grade observations and expert-identified GBIF datasets, CC0, CC BY and CC BY-NC. Sources
- Seasons use the published method and its evidence thresholds. Methods
- See it on iNaturalist (opens in a new tab)OpenPhenology is independent and not affiliated with iNaturalist.
Records behind the Ottawa County result
46 records from 1 dataset.
- iNaturalist Research-grade Observations (opens in a new tab) · iNaturalist.org · 46 recordsiNaturalist contributors, iNaturalist (2026). iNaturalist Research-grade Observations. iNaturalist.org. Occurrence dataset https://doi.org/10.15468/ab3s5x accessed via GBIF.org on 2026-11-13.
To cite: the GBIF download doi:10.15468/dl.y2jkt8 (opens in a new tab).
A spreadsheet (CSV) with a link to each record, on iNaturalist or GBIF. Records whose location was hidden by the observer or the source are counted but not linked.