garlic penny-cress (Mummenhoffia alliacea)
(c) Emily Feist, some rights reserved (CC BY-NC), uploaded by Emily Feist · CC BY-NC 4.0 (opens in a new tab) · iNaturalist (opens in a new tab)
Flowering plantsIn Gallia County, Ohio

Garlic penny-cress

Mummenhoffia alliacea (L.) Esmailbegi & Al-Shehbaz

Garlic penny-cress in all of Ohio
Kingdom
Plantae
Phylum
Tracheophyta
Genus
Mummenhoffia

Introduced and invasive status

Introduced in Ohio: iNaturalist (opens in a new tab)

Also listed

  • Introduced in the lower 48 states (listed as Thlaspi alliaceum)

iNaturalist's volunteer curators list it as introduced in their Ohio checklist.

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)

Near Gallia County

Range

Where it is recorded

Season shown in 2 of Ohio's 88 counties. Explore Ohio

  • No result yet (60)
  • Recorded, too few records for a result (24)
  • Recorded, season not shown (2)
  • Season shown (2)
Boundaries: U.S. Census Bureau, 2025 Cartographic Boundary Files, 1:500,000. Show as a table
Counties as a table
garlic penny-cress by Ohio county: records and mapped range
CountyRecords
Adams CountyRecorded, too few records for a result
Allen CountyNo qualifying records yet
Ashland CountyNo qualifying records yet
Ashtabula CountyNo qualifying records yet
Athens County52 · Recorded, season not shown
Auglaize CountyNo qualifying records yet
Belmont CountyNo qualifying records yet
Brown CountyRecorded, too few records for a result
Butler County24 · Recorded, season not shown
Carroll CountyNo qualifying records yet
Champaign CountyNo qualifying records yet
Clark CountyRecorded, too few records for a result
Clermont CountyRecorded, too few records for a result
Clinton CountyNo qualifying records yet
Columbiana CountyNo qualifying records yet
Coshocton CountyNo qualifying records yet
Crawford CountyNo qualifying records yet
Cuyahoga CountyNo qualifying records yet
Darke CountyNo qualifying records yet
Defiance CountyNo qualifying records yet
Delaware CountyNo qualifying records yet
Erie CountyNo qualifying records yet
Fairfield CountyRecorded, too few records for a result
Fayette CountyNo qualifying records yet
Franklin CountyRecorded, too few records for a result
Fulton CountyNo qualifying records yet
Gallia County23 · Season shown
Geauga CountyNo qualifying records yet
Greene CountyRecorded, too few records for a result
Guernsey CountyNo qualifying records yet
Hamilton County78 · Season shown
Hancock CountyNo qualifying records yet
Hardin CountyNo qualifying records yet
Harrison CountyNo qualifying records yet
Henry CountyNo qualifying records yet
Highland CountyRecorded, too few records for a result
Hocking CountyRecorded, too few records for a result
Holmes CountyNo qualifying records yet
Huron CountyNo qualifying records yet
Jackson CountyRecorded, too few records for a result
Jefferson CountyNo qualifying records yet
Knox CountyNo qualifying records yet
Lake CountyNo qualifying records yet
Lawrence CountyRecorded, too few records for a result
Licking CountyRecorded, too few records for a result
Logan CountyNo qualifying records yet
Lorain CountyNo qualifying records yet
Lucas CountyNo qualifying records yet
Madison CountyNo qualifying records yet
Mahoning CountyNo qualifying records yet
Marion CountyNo qualifying records yet
Medina CountyNo qualifying records yet
Meigs CountyRecorded, too few records for a result
Mercer CountyNo qualifying records yet
Miami CountyNo qualifying records yet
Monroe CountyNo qualifying records yet
Montgomery CountyRecorded, too few records for a result
Morgan CountyNo qualifying records yet
Morrow CountyNo qualifying records yet
Muskingum CountyNo qualifying records yet
Noble CountyNo qualifying records yet
Ottawa CountyNo qualifying records yet
Paulding CountyNo qualifying records yet
Perry CountyNo qualifying records yet
Pickaway CountyRecorded, too few records for a result
Pike CountyRecorded, too few records for a result
Portage CountyNo qualifying records yet
Preble CountyRecorded, too few records for a result
Putnam CountyNo qualifying records yet
Richland CountyRecorded, too few records for a result
Ross CountyNo qualifying records yet
Sandusky CountyNo qualifying records yet
Scioto CountyRecorded, too few records for a result
Seneca CountyNo qualifying records yet
Shelby CountyNo qualifying records yet
Stark CountyRecorded, too few records for a result
Summit CountyNo qualifying records yet
Trumbull CountyNo qualifying records yet
Tuscarawas CountyRecorded, too few records for a result
Union CountyNo qualifying records yet
Van Wert CountyNo qualifying records yet
Vinton CountyRecorded, too few records for a result
Warren CountyRecorded, too few records for a result
Washington CountyRecorded, too few records for a result
Wayne CountyNo qualifying records yet
Williams CountyNo qualifying records yet
Wood CountyNo qualifying records yet
Wyandot CountyNo 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 Gallia County

Late March to early May, middle week Apr 12–18

Show over the bars
Recording in Gallia County · records of all species each week, 2,598 in all

Records per week from 23 records in 5 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 21 dates. Latest record: April 2025.

Show as a table
Records of garlic penny-cress in Gallia County each week, and records of all species
WeekRecords of garlic penny-cressYears recordedRecords of all species
Jan 4–10000
Jan 11–17005
Jan 18–24003
Jan 25–31001
Feb 1–7001
Feb 8–14003
Feb 15–21001
Feb 22–28002
Mar 1–7003
Mar 8–14000
Mar 15–210031
Mar 22–281132
Mar 29 – Apr 43261
Apr 5–114360
Apr 12–184385
Apr 19–2521100
Apr 26 – May 264163
May 3–932222
May 10–160026
May 17–230020
May 24–300052
May 31 – Jun 600473
Jun 7–130024
Jun 14–2000173
Jun 21–270053
Jun 28 – Jul 40033
Jul 5–110037
Jul 12–180067
Jul 19–250026
Jul 26 – Aug 10036
Aug 2–80069
Aug 9–150048
Aug 16–220019
Aug 23–290058
Aug 30 – Sep 50057
Sep 6–120057
Sep 13–1900161
Sep 20–260035
Sep 27 – Oct 30075
Oct 4–100066
Oct 11–170017
Oct 18–240025
Oct 25–310036
Nov 1–70023
Nov 8–14009
Nov 15–210022
Nov 22–28002
Nov 29 – Dec 50013
Dec 6–12002
Dec 13–19001
Dec 20–26001
Dec 27 – Jan 2009

Reported in flower

No records here show flowers yet, so there is no flowering season to show. 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-March to mid-May, middle week Apr 12–18

Show over the bars
Recording in Ohio · records of all species each week, 1,691,199 in all

Records per week from 300 records in 6 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 182 dates. Latest record: November 2025.

Show as a table
Records of garlic penny-cress in Ohio each week, and records of all species
WeekRecords of garlic penny-cressYears recordedRecords of all species
Jan 4–10006,211
Jan 11–17005,146
Jan 18–24004,645
Jan 25–31004,698
Feb 1–7006,023
Feb 8–14005,888
Feb 15–21005,436
Feb 22–28006,846
Mar 1–7118,321
Mar 8–144210,384
Mar 15–2112412,620
Mar 22–2819613,949
Mar 29 – Apr 448619,661
Apr 5–1155626,860
Apr 12–1845539,925
Apr 19–2523541,623
Apr 26 – May 235656,391
May 3–929552,952
May 10–167453,785
May 17–237557,698
May 24–307454,651
May 31 – Jun 64253,099
Jun 7–131153,700
Jun 14–201156,625
Jun 21–270055,361
Jun 28 – Jul 40058,477
Jul 5–111161,336
Jul 12–180064,722
Jul 19–250069,753
Jul 26 – Aug 10059,416
Aug 2–80059,712
Aug 9–150055,994
Aug 16–220054,328
Aug 23–290051,772
Aug 30 – Sep 50057,167
Sep 6–120059,075
Sep 13–190054,543
Sep 20–260045,860
Sep 27 – Oct 30043,180
Oct 4–100037,841
Oct 11–170030,824
Oct 18–240021,156
Oct 25–310019,021
Nov 1–70014,172
Nov 8–140012,621
Nov 15–21007,965
Nov 22–28008,136
Nov 29 – Dec 5116,083
Dec 6–12006,004
Dec 13–19005,423
Dec 20–26005,661
Dec 27 – Jan 2008,459

Reported in flower

Usually reported in flower mid-March to late April, middle week Apr 12–18.

From 32 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 8 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.

Often confused with

  • shepherd's-purse Capsella bursa-pastorisOften confused in Ohio: 26 identifications in Ohio named one where the other was meant
  • field penny-cress Thlaspi arvenseOften confused in Ohio: 20 identifications in Ohio named one where the other was meant
  • field peppergrass Lepidium campestreOften confused in Ohio: 11 identifications in Ohio named one where the other was meant
  • Virginia pepperweed Lepidium virginicum52 identifications worldwide named one where the other was meant
  • Microthlaspi perfoliatum Microthlaspi perfoliatum22 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

  1. Jan: no record
  2. Feb: recorded
  3. Mar: recorded
  4. Apr: recorded
  5. May: recorded
  6. Jun: recorded
  7. Jul: recorded
  8. Aug: no record
  9. Sep: no record
  10. Oct: no record
  11. Nov: recorded
  12. Dec: no record

Not reported in Ohio in August to October and December to January, 2016 to 2025.

Land cover where it is recorded

Land coverIts recordsAll Ohio records
Developed62%49%
Farmland21%11%
Forest14%31%
Barren2%0.6%
Grassland and shrub2%0.9%
Open water0.5%3%

From 200 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 Gallia County result

23 records from 1 dataset.

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.