Season shown in 2 of Ohio's 88 counties. Explore Ohio
No result yet (60)
Recorded, too few records for a result (22)
Recorded, season not shown (4)
Season shown (2)
Boundaries: U.S. Census Bureau, 2025 Cartographic Boundary Files, 1:500,000. Show as a table
Counties as a table
Canadian lousewort by Ohio county: records and mapped range
County
Records
Adams County
77 · Recorded, season not shown
Allen County
No qualifying records yet
Ashland County
Recorded, too few records for a result
Ashtabula County
No qualifying records yet
Athens County
21 · Season shown
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
Recorded, too few records for a result
Clark County
No qualifying records yet
Clermont County
Recorded, too few records for a result
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
No qualifying records yet
Erie County
No qualifying records yet
Fairfield County
Recorded, too few records for a result
Fayette County
No qualifying records yet
Franklin County
Recorded, too few records for a result
Fulton County
No qualifying records yet
Gallia County
No qualifying records yet
Geauga County
No qualifying records yet
Greene County
35 · Recorded, season not shown
Guernsey County
Recorded, too few records for a result
Hamilton County
Recorded, too few records for a result
Hancock County
No qualifying records yet
Hardin County
No qualifying records yet
Harrison County
No qualifying records yet
Henry County
No qualifying records yet
Highland County
27 · Recorded, season not shown
Hocking County
Recorded, too few records for a result
Holmes County
No qualifying records yet
Huron County
No qualifying records yet
Jackson County
No qualifying records yet
Jefferson County
No qualifying records yet
Knox County
No qualifying records yet
Lake County
No qualifying records yet
Lawrence County
Recorded, too few records for a result
Licking County
No qualifying records yet
Logan County
No qualifying records yet
Lorain County
No qualifying records yet
Lucas County
61 · Recorded, season not shown
Madison County
No qualifying records yet
Mahoning County
Recorded, too few records for a result
Marion County
No qualifying records yet
Medina County
No qualifying records yet
Meigs County
Recorded, too few records for a result
Mercer County
No qualifying records yet
Miami County
No qualifying records yet
Monroe County
Recorded, too few records for a result
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
No qualifying records yet
Paulding County
No qualifying records yet
Perry County
Recorded, too few records for a result
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
No qualifying records yet
Putnam County
No qualifying records yet
Richland County
Recorded, too few records for a result
Ross County
Recorded, too few records for a result
Sandusky County
No qualifying records yet
Scioto County
34 · Season shown
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
Recorded, too few records for a result
Union County
No qualifying records yet
Van Wert County
No qualifying records yet
Vinton County
Recorded, too few records for a result
Warren County
No qualifying records yet
Washington County
Recorded, too few records for a result
Wayne County
No qualifying records yet
Williams County
No qualifying records yet
Wood County
No qualifying records yet
Wyandot County
No qualifying records yet
No mapped range from the range source used, the USGS Gap Analysis Project, which maps land vertebrates only.
Season
When it is recorded
In Greene County
Not enough evidence
The weeks are still too uncertain to show a season. Based on 35 records in 6 of the 10 years from 2016 to 2025, above the minimum of 20 records from 5 different years.
JanFebMarAprMayJunJulAugSepOctNovDec
Show over the bars
Recording in Greene County · records of all species each week, 31,407 in all
Records per week from 35 records in 6 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
Records of Canadian lousewort in Greene County each week, and records of all species
Week
Records of Canadian lousewort
Years recorded
Records of all species
Jan 4–10
0
0
97
Jan 11–17
0
0
49
Jan 18–24
0
0
37
Jan 25–31
0
0
55
Feb 1–7
0
0
82
Feb 8–14
0
0
90
Feb 15–21
0
0
186
Feb 22–28
0
0
151
Mar 1–7
0
0
124
Mar 8–14
0
0
238
Mar 15–21
0
0
299
Mar 22–28
1
1
338
Mar 29 – Apr 4
2
2
561
Apr 5–11
4
1
537
Apr 12–18
1
1
738
Apr 19–25
6
4
793
Apr 26 – May 2
4
3
1,090
May 3–9
6
4
778
May 10–16
2
1
721
May 17–23
2
2
889
May 24–30
1
1
932
May 31 – Jun 6
0
0
889
Jun 7–13
0
0
1,186
Jun 14–20
0
0
1,205
Jun 21–27
1
1
1,059
Jun 28 – Jul 4
0
0
1,150
Jul 5–11
0
0
1,279
Jul 12–18
0
0
1,164
Jul 19–25
1
1
1,228
Jul 26 – Aug 1
0
0
1,533
Aug 2–8
0
0
1,324
Aug 9–15
0
0
1,105
Aug 16–22
2
2
957
Aug 23–29
1
1
942
Aug 30 – Sep 5
0
0
932
Sep 6–12
1
1
992
Sep 13–19
0
0
1,194
Sep 20–26
0
0
870
Sep 27 – Oct 3
0
0
677
Oct 4–10
0
0
614
Oct 11–17
0
0
533
Oct 18–24
0
0
305
Oct 25–31
0
0
307
Nov 1–7
0
0
214
Nov 8–14
0
0
227
Nov 15–21
0
0
155
Nov 22–28
0
0
110
Nov 29 – Dec 5
0
0
86
Dec 6–12
0
0
36
Dec 13–19
0
0
46
Dec 20–26
0
0
117
Dec 27 – Jan 2
0
0
186
Reported in flower
Only 3 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
Mid-April to late August, middle week May 3–9
Middle week · May 3–9
This week · Nov 8–14
JanFebMarAprMayJunJulAugSepOctNovDec
Show over the bars
Recording in Ohio · records of all species each week, 1,691,199 in all
Records per week from 518 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 307 dates. Latest record: November 2025.
Show as a table
Records of Canadian lousewort in Ohio each week, and records of all species
Week
Records of Canadian lousewort
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
3
2
12,620
Mar 22–28
1
1
13,949
Mar 29 – Apr 4
6
4
19,661
Apr 5–11
15
5
26,860
Apr 12–18
40
9
39,925
Apr 19–25
47
7
41,623
Apr 26 – May 2
93
9
56,391
May 3–9
72
9
52,952
May 10–16
60
9
53,785
May 17–23
37
10
57,698
May 24–30
28
9
54,651
May 31 – Jun 6
11
7
53,099
Jun 7–13
12
5
53,700
Jun 14–20
11
5
56,625
Jun 21–27
5
3
55,361
Jun 28 – Jul 4
4
4
58,477
Jul 5–11
6
4
61,336
Jul 12–18
3
3
64,722
Jul 19–25
12
6
69,753
Jul 26 – Aug 1
8
5
59,416
Aug 2–8
8
5
59,712
Aug 9–15
4
2
55,994
Aug 16–22
4
3
54,328
Aug 23–29
3
3
51,772
Aug 30 – Sep 5
4
3
57,167
Sep 6–12
2
2
59,075
Sep 13–19
5
3
54,543
Sep 20–26
2
2
45,860
Sep 27 – Oct 3
1
1
43,180
Oct 4–10
2
2
37,841
Oct 11–17
2
1
30,824
Oct 18–24
1
1
21,156
Oct 25–31
1
1
19,021
Nov 1–7
1
1
14,172
Nov 8–14
1
1
12,621
Nov 15–21
3
3
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
No flowering season shown here. Most records come from a single year, so a season is not shown yet.
Reported in fruit
Only 4 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
Telling it apart
From what Ohio’s records show. Only what the records support is shown.
swamp lousewortPedicularis lanceolata91 identifications worldwide named one where the other was meant
leafcupPolymnia canadensis18 identifications worldwide named one where the other was meant
broad beech fernPhegopteris hexagonoptera10 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: no record
Feb: no record
Mar: recorded
Apr: recorded
May: recorded
Jun: recorded
Jul: recorded
Aug: recorded
Sep: recorded
Oct: recorded
Nov: recorded
Dec: no record
Not reported in Ohio in December to February, 2016 to 2025.
Land cover where it is recorded
Land cover
Its recordsAll Ohio records
Forest
69%31%
Wetland
16%5%
Developed
12%49%
Farmland
2%11%
Open water
0.8%3%
From 245 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
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.
