Purple Cress
Cardamine douglassii (Torr.) Britton
Purple Cress in all of Ohio- Kingdom
- Plantae
- Phylum
- Tracheophyta
- Class
- Magnoliopsida
- Order
- Capparales
- Family
- Brassicaceae
- Genus
- Cardamine
Range
Where it is recorded
Season shown in 15 of Ohio's 88 counties. Explore Ohio
- No result yet (19)
- Recorded, too few records for a result (53)
- Recorded, season not shown (1)
- Season shown (15)
Counties as a table
| County | Records |
|---|---|
| Adams County | 31 · Season shown |
| Allen County | 25 · Recorded, season not shown |
| Ashland County | Recorded, too few records for a result |
| Ashtabula County | Recorded, too few records for a result |
| Athens County | 124 · Season shown |
| Auglaize County | No qualifying records yet |
| Belmont County | Recorded, too few records for a result |
| Brown County | No qualifying records yet |
| Butler County | 21 · Season shown |
| Carroll County | Recorded, too few records for a result |
| Champaign County | Recorded, too few records for a result |
| Clark County | Recorded, too few records for a result |
| Clermont County | 55 · Season shown |
| Clinton County | Recorded, too few records for a result |
| Columbiana County | Recorded, too few records for a result |
| Coshocton County | Recorded, too few records for a result |
| Crawford County | Recorded, too few records for a result |
| Cuyahoga County | 37 · Season shown |
| Darke County | Recorded, too few records for a result |
| Defiance County | No qualifying records yet |
| Delaware County | 29 · Season shown |
| Erie County | Recorded, too few records for a result |
| Fairfield County | Recorded, too few records for a result |
| Fayette County | No qualifying records yet |
| Franklin County | 84 · Season shown |
| Fulton County | Recorded, too few records for a result |
| Gallia County | Recorded, too few records for a result |
| Geauga County | 26 · Season shown |
| Greene County | 77 · Season shown |
| Guernsey County | Recorded, too few records for a result |
| Hamilton County | 76 · Season shown |
| Hancock County | Recorded, too few records for a result |
| Hardin County | Recorded, too few records for a result |
| Harrison County | No qualifying records yet |
| Henry County | No qualifying records yet |
| Highland County | Recorded, too few records for a result |
| Hocking County | No qualifying records yet |
| Holmes County | No qualifying records yet |
| Huron County | Recorded, too few records for a result |
| Jackson County | Recorded, too few records for a result |
| Jefferson County | No qualifying records yet |
| Knox County | Recorded, too few records for a result |
| Lake County | Recorded, too few records for a result |
| Lawrence County | No qualifying records yet |
| Licking County | Recorded, too few records for a result |
| Logan County | Recorded, too few records for a result |
| Lorain County | 27 · Season shown |
| Lucas County | Recorded, too few records for a result |
| Madison County | Recorded, too few records for a result |
| Mahoning County | Recorded, too few records for a result |
| Marion County | Recorded, too few records for a result |
| Medina County | 50 · Season shown |
| Meigs County | Recorded, too few records for a result |
| Mercer County | Recorded, too few records for a result |
| Miami County | Recorded, too few records for a result |
| Monroe County | Recorded, too few records for a result |
| Montgomery County | 41 · Season shown |
| Morgan County | Recorded, too few records for a result |
| Morrow County | Recorded, too few records for a result |
| Muskingum County | Recorded, too few records for a result |
| Noble County | No qualifying records yet |
| Ottawa County | Recorded, too few records for a result |
| Paulding County | No qualifying records yet |
| Perry County | No qualifying records yet |
| Pickaway County | No qualifying records yet |
| Pike County | Recorded, too few records for a result |
| Portage County | Recorded, too few records for a result |
| Preble County | Recorded, too few records for a result |
| 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 | Recorded, too few records for a result |
| Seneca County | No qualifying records yet |
| Shelby County | Recorded, too few records for a result |
| Stark County | Recorded, too few records for a result |
| Summit County | 88 · Season shown |
| Trumbull County | Recorded, too few records for a result |
| Tuscarawas County | Recorded, too few records for a result |
| Union County | Recorded, too few records for a result |
| Van Wert County | No qualifying records yet |
| Vinton County | Recorded, too few records for a result |
| Warren County | 50 · Season shown |
| Washington County | Recorded, too few records for a result |
| Wayne County | Recorded, too few records for a result |
| 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 Allen County
Not enough evidence
Records per week from 25 records in 5 of the 10 years from 2016 to 2025. Shows when people recorded it, not a season or how common it is.
Show as a table
| Week | Records of Purple Cress | Years recorded | Records of all species |
|---|---|---|---|
| Jan 4–10 | 0 | 0 | 14 |
| Jan 11–17 | 0 | 0 | 4 |
| Jan 18–24 | 0 | 0 | 10 |
| Jan 25–31 | 0 | 0 | 12 |
| Feb 1–7 | 0 | 0 | 28 |
| Feb 8–14 | 0 | 0 | 46 |
| Feb 15–21 | 0 | 0 | 46 |
| Feb 22–28 | 0 | 0 | 8 |
| Mar 1–7 | 0 | 0 | 39 |
| Mar 8–14 | 0 | 0 | 9 |
| Mar 15–21 | 0 | 0 | 39 |
| Mar 22–28 | 2 | 2 | 77 |
| Mar 29 – Apr 4 | 10 | 2 | 195 |
| Apr 5–11 | 7 | 2 | 205 |
| Apr 12–18 | 5 | 3 | 314 |
| Apr 19–25 | 1 | 1 | 128 |
| Apr 26 – May 2 | 0 | 0 | 195 |
| May 3–9 | 0 | 0 | 207 |
| May 10–16 | 0 | 0 | 124 |
| May 17–23 | 0 | 0 | 104 |
| May 24–30 | 0 | 0 | 203 |
| May 31 – Jun 6 | 0 | 0 | 186 |
| Jun 7–13 | 0 | 0 | 120 |
| Jun 14–20 | 0 | 0 | 180 |
| Jun 21–27 | 0 | 0 | 213 |
| Jun 28 – Jul 4 | 0 | 0 | 199 |
| Jul 5–11 | 0 | 0 | 219 |
| Jul 12–18 | 0 | 0 | 268 |
| Jul 19–25 | 0 | 0 | 226 |
| Jul 26 – Aug 1 | 0 | 0 | 163 |
| Aug 2–8 | 0 | 0 | 220 |
| Aug 9–15 | 0 | 0 | 191 |
| Aug 16–22 | 0 | 0 | 182 |
| Aug 23–29 | 0 | 0 | 240 |
| Aug 30 – Sep 5 | 0 | 0 | 134 |
| Sep 6–12 | 0 | 0 | 136 |
| Sep 13–19 | 0 | 0 | 274 |
| Sep 20–26 | 0 | 0 | 164 |
| Sep 27 – Oct 3 | 0 | 0 | 245 |
| Oct 4–10 | 0 | 0 | 96 |
| Oct 11–17 | 0 | 0 | 70 |
| Oct 18–24 | 0 | 0 | 90 |
| Oct 25–31 | 0 | 0 | 84 |
| Nov 1–7 | 0 | 0 | 40 |
| Nov 8–14 | 0 | 0 | 34 |
| Nov 15–21 | 0 | 0 | 24 |
| Nov 22–28 | 0 | 0 | 16 |
| Nov 29 – Dec 5 | 0 | 0 | 11 |
| Dec 6–12 | 0 | 0 | 11 |
| Dec 13–19 | 0 | 0 | 12 |
| Dec 20–26 | 0 | 0 | 10 |
| Dec 27 – Jan 2 | 0 | 0 | 65 |
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
Early March to late April, middle week Apr 5–11
Records per week from 1,613 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 417 dates. Latest record: May 2025.
Show as a table
| Week | Records of Purple Cress | Years recorded | Records of all species |
|---|---|---|---|
| Jan 4–10 | 0 | 0 | 6,211 |
| Jan 11–17 | 2 | 1 | 5,146 |
| Jan 18–24 | 0 | 0 | 4,645 |
| Jan 25–31 | 0 | 0 | 4,698 |
| Feb 1–7 | 3 | 2 | 6,023 |
| Feb 8–14 | 3 | 2 | 5,888 |
| Feb 15–21 | 2 | 1 | 5,436 |
| Feb 22–28 | 11 | 5 | 6,846 |
| Mar 1–7 | 26 | 4 | 8,321 |
| Mar 8–14 | 49 | 7 | 10,384 |
| Mar 15–21 | 108 | 9 | 12,620 |
| Mar 22–28 | 207 | 10 | 13,949 |
| Mar 29 – Apr 4 | 336 | 10 | 19,661 |
| Apr 5–11 | 328 | 10 | 26,860 |
| Apr 12–18 | 258 | 10 | 39,925 |
| Apr 19–25 | 165 | 10 | 41,623 |
| Apr 26 – May 2 | 89 | 9 | 56,391 |
| May 3–9 | 18 | 5 | 52,952 |
| May 10–16 | 1 | 1 | 53,785 |
| May 17–23 | 2 | 2 | 57,698 |
| May 24–30 | 2 | 2 | 54,651 |
| May 31 – Jun 6 | 0 | 0 | 53,099 |
| Jun 7–13 | 0 | 0 | 53,700 |
| Jun 14–20 | 0 | 0 | 56,625 |
| Jun 21–27 | 0 | 0 | 55,361 |
| Jun 28 – Jul 4 | 0 | 0 | 58,477 |
| Jul 5–11 | 0 | 0 | 61,336 |
| Jul 12–18 | 0 | 0 | 64,722 |
| Jul 19–25 | 0 | 0 | 69,753 |
| Jul 26 – Aug 1 | 0 | 0 | 59,416 |
| Aug 2–8 | 0 | 0 | 59,712 |
| Aug 9–15 | 0 | 0 | 55,994 |
| Aug 16–22 | 0 | 0 | 54,328 |
| Aug 23–29 | 0 | 0 | 51,772 |
| Aug 30 – Sep 5 | 0 | 0 | 57,167 |
| Sep 6–12 | 0 | 0 | 59,075 |
| Sep 13–19 | 0 | 0 | 54,543 |
| Sep 20–26 | 0 | 0 | 45,860 |
| Sep 27 – Oct 3 | 0 | 0 | 43,180 |
| Oct 4–10 | 0 | 0 | 37,841 |
| Oct 11–17 | 1 | 1 | 30,824 |
| Oct 18–24 | 0 | 0 | 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 | 1 | 1 | 7,965 |
| Nov 22–28 | 0 | 0 | 8,136 |
| Nov 29 – Dec 5 | 1 | 1 | 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 early March to mid-April, middle week Mar 29 – Apr 4.
From 209 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 3 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.
Relatives
In the same genus
Other Cardamine recorded in Allen County
Identification
How to identify it
Often confused with
- bulbous cress Cardamine bulbosaOften confused in Ohio: 20 identifications in Ohio named one where the other was meant
- cut-leaved toothwort Cardamine concatenataOften confused in Ohio: 12 identifications in Ohio named one where the other was meant
- Slender toothwort Cardamine angustata40 identifications worldwide named one where the other was meant
- Cuckooflower Cardamine pratensis24 identifications worldwide named one where the other was meant
- Virginia Springbeauty Claytonia virginica24 identifications worldwide named one where the other was meant
From iNaturalist’s similar-species counts, refreshed monthly: confusions in Ohio first, then worldwide. Only species with an Ohio result are listed.
Months not reported
- Jan: recorded
- Feb: recorded
- Mar: recorded
- Apr: recorded
- May: recorded
- Jun: no record
- Jul: no record
- Aug: no record
- Sep: no record
- Oct: recorded
- Nov: recorded
- Dec: no record
Not reported in Ohio in June to September and December, 2016 to 2025.
Land cover where it is recorded
| Land cover | Its recordsAll Ohio records |
|---|---|
| Forest | 85%31% |
| Developed | 9%49% |
| Wetland | 4%5% |
| Farmland | 2%11% |
From 874 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 Ohio result
1,613 records from 2 datasets.
- iNaturalist Research-grade Observations (opens in a new tab) · iNaturalist.org · 1,472 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.
- iNaturalist observations (opens in a new tab) · iNaturalist.org · 141 recordsiNaturalist. Available from https://www.inaturalist.org. Accessed 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.