Thlaspi arvense (Field Penny-Cress)

Thlaspi arvense (Field Penny-Cress) on 6-12-22, #890-48.

Field Penny-Cress, Field Pennycress

Thlaspi arvense

THLAS-pee  ar-VEN-see

Synonyms of Thlaspi arvense (12)(Updated on 12-4-22 from Plants of the World Online): Crucifera thlaspi (Roxb.) E.H.L.Krause (1902), Lepidium thlaspi Roxb. (1832), Teruncius arvensis (L.) Lunell (1916), Thlaspidea arvensis (L.) Opiz (1852), Thlaspidium arvense (L.) Bubani (1901), Thlaspi arvense var. sinuatum H.Lév. (1916), Thlaspi baicalense DC. (1821), Thlaspi collinum M.Bieb. (1808), Thlaspi latifolium Opiz (1825)(nom. illeg.), Thlaspi lutescens Gilib. (1782)(opus utique oppr.), Thlaspi nemorosum Adam ex DC. (1824), Thlaspi strictum Dalla Torre & Sarnth. (1909)(nom. illeg.)

Thlaspi arvense L. is the accepted scientific name for the Field Penny-Cress. The genus and species were named and described as such by Carl von Linnaeus in the second volume of the first edition of Species Plantarum in 1753.

As of 12-4-22 when this page was last updated, Plants of the World Online lists 9 species in the Thlaspi genus. It is a member of the plant family Brassicaceae with 343 genera.

Distribution map of Thlaspi arvense from Plants of the World Online. Facilitated by the Royal Botanic Gardens, Kew. Published on the Internet; http://www.plantsoftheworldonline.org/. Retrieved on December 3, 2022.

The above distribution map for Thlaspi arvense is from Plants of the World Online. Areas in green are where the species is native and purple is where it has been introduced. The map on the USDA Plants Database is… Well, the map wouldn’t show up when I was writing this page. Some days it does and some days it doesn’t… Maybe it will work for you.

The map on iNaturalist shows where members have made observations. Anyone can join and it is a great website to confirm and share your observations. The maps on iNaturalist are continually updated as members post new observations.

THERE ARE SEVERAL LINKS AT THE BOTTOM OF THE PAGE FOR FURTHER READING AND TO HELP WITH A POSITIVE ID.

Thlaspi arvense (Field Penny-Cress) on 5-22-22, #882-44.

I had been working on the various species of Ranunculus on the farm, and on May 22 in 2020 I noticed an odd plant sticking up through the Ranunculus arbortivus next to the gate. I looked around and didn’t see anymore in the area. I took a photo and uploaded it on iNaturalist to see what it could possibly be. The top suggestion was Thlaspi arvense with the common name Field Penny-Cress. I checked the Missouri Plants website to see what it had to say and look at their photos and came to the conclusion that iNaturalist was correct.

Thlaspi arvense (Field Penny-Cress) on 5-24-22, #883-23.

Then on the 24th, I walked to an area north of the pond to see if I could find the Sisymbrium officinale (Hedge Mustard). Lo and behold, there was a colony of Field Penny-Cress. Most of the plants were very large, but there were smaller plants in another colony a few feet away. The larger plants didn’t have flowers, but the smaller plants did. OH, I didn’t find the Hedge Mustard until May 28… It had relocated.

Thlaspi arvense (Field Penny-Cress) on 5-24-22, #883-24.

I will come back later and write more information and complete descriptions. I am making updates to the site, adding new photos to old pages, and adding new pages. Once I am finished, I will go back and write descriptions. For me, that is the most difficult part and it takes me a long time. There are several very good links at the bottom of the page that have very good descriptions that can help with a positive ID.

Thlaspi arvense (Field Penny-Cress) on 5-24-22, #883-25.

 

Thlaspi arvense (Field Penny-Cress) on 5-24-22, #883-26.

 

Thlaspi arvense (Field Penny-Cress) on 5-24-22, #883-27.

 

Thlaspi arvense (Field Penny-Cress) on 5-24-22, #883-28.

 

Thlaspi arvense (Field Penny-Cress) on 5-24-22, #883-29.

 

Thlaspi arvense (Field Penny-Cress) on 5-24-22, #883-30.

 

Thlaspi arvense (Field Penny-Cress) on 5-25-22, #884-11.

The close-ups I took of the flowers on May 24 were blurry, so I went back on the 25th to see if I could do better.

Thlaspi arvense (Field Penny-Cress) on 5-25-22, #884-12.

 

Thlaspi arvense (Field Penny-Cress) on 6-12-22, #890-48.

I live on a small farm in Windsor, Missouri where I enjoy gardening, collecting plants, and identifying wildflowers. The farm is in Pettis County but Henry County is across the street, and Benton and Johnson aren’t far away. I have grown over 500 different plants and identified over 250 species of wildflowers (most have pages listed on the right side of the page). I am not an expert, botanist, or horticulturalist. I just like growing, photographing, and writing about my experience. I rely on several websites for ID and a few horticulturalists I contact if I cannot figure them out. Wildflowers can be variable from location to location, so that can be a bit confusing. If you see I have made an error, please let me know so I can correct what I have written.

I hope you found this page useful and be sure to check the links below for more information. They were written by experts and provide much more information. Some sites may not be up-to-date but they are always a work in progress. If you can, I would appreciate it if you would click on the “Like” below and leave a comment. It helps us bloggers stay motivated. You can also send an email to me at thebelmontrooster@yahoo.com. I would enjoy hearing from you especially if you notice something is a bit whacky.

FOR FURTHER READING:
PLANTS OF THE WORLD ONLINE (GENUS/SPECIES)
INTERNATIONAL PLANT NAMES INDEX (GENUS/SPECIES)
TROPICOS (GENUS/SPECIES)
FLORA OF MISSOURI (GENUS/SPECIES)
FLORA OF NORTH AMERICA (GENUS/SPECIES)
WORLD FLORA ONLINE (GENUS/SPECIES)
WIKIPEDIA (GENUS/SPECIES)
USDA PLANTS DATABASE
iNATURALIST
MISSOURI PLANTS
MIDWEST WEEDS AND WILDFLOWERS
UNIVERSITY OF MISSOURI-WEED ID GUIDE
WILDFLOWER SEARCH
ARKANSAS NATIVE PLANT SOCIETY
DAVE’S GARDEN
EDIBLE WILD FOOD
FLORA FINDER
FRIENDS OF THE WILDFLOWER GARDEN
GO BOTANY
ILLINOIS WILDFLOWERS
KANSAS WILDFLOWERS AND GRASSES
LADY BIRD JOHNSON WILDFLOWER CENTER
MARYLAND BIODIVERSITY PROJECT
MINNESOTA WILDFLOWERS
MONTANA PLANT LIFE
NORTH CAROLINA STATE UNIVERSITY
PFAF (PLANTS FOR A FUTURE)
SONG OF THE WOODS
WISCONSIN HORTICULTURE

NOTE: The data (figures, maps, accepted names, etc.) may not match on these websites. It depends on when and how they make updates and when their sources make updates. Some websites have hundreds and even many thousands of species to keep up with. Accepted scientific names change periodically and it can be hard to keep with as well. Some of the links may use a name that is a synonym on other sites. In my opinion, Plants of the World Online by Kew is the most reliable and up-to-date plant database and they make updates on a regular basis. I make updates “at least” once a year and when I write new pages or add new photos but I do get behind. We are all a work in progress. 🙂