Rosinweed, Whole-Leaf Rosinweed, Wholeleaf Rosinweed, Entire-Leaf Rosinweed, Prairie Rosinweed
Synonyms of Silphium integrifolium (3) (Updated on 5-22-21 from plants of the World Online): Silphium integrifolium var. deamii L.M.Perry, Silphium integrifolium var. neglectum Settle & T.R.Fisher, Silphium integrifolium var. ternatum Alph.Wood
Silphium integrifolium Michx. is the correct and accepted scientific name for the Rosinweed. It was named and described by André Michaux in Flora Boreali-Americana in 1803. Silphium integrifolium var. laeve Torr. & A.Gray is an accepted infraspecific name.
The genus, Silphium L., was named and described by Carl von Linnaeus in the second edition of Species Plantarum in 1753.
Plants of the World Online by Kew lists 13 species in the Silphium genus (as of 4-25-21 when I last updated this page). It is a member of the plant family Asteraceae with 1,671 genera. Those numbers could change periodically as updates are made by POWO. The number of genera in the family changes quite often, up or down.
The above distribution map of Silphium integrifolium is from the USDA Plants Database. Areas in green are where the species is native and blue where it has been introduced. The maps on Plants of the World Online and Flora of North America are slightly different.
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.
THERE ARE SEVERAL LINKS AT THE BOTTOM OF THE PAGE FOR FURTHER READING AND TO HELP WITH A BETTER POSITIVE ID.
There are always quite a few Silphium integrifolium growing along the edge of the south hayfield. They are impressive plants that always make a statement. Common names include Rosinweed, Whole-Leaf Rosinweed, Entire-Leaf Rosinweed, Prarie Rosinweed, and probably others. They are a common sight along highways, backroads, and trails.
I apologize for not writing descriptions at the moment, but I have A LOT of wildflower pages to make and publish before I start getting too busy. I update this site and add new pages over the winter but I didn’t get finished. SO, I decided to just make the page with photos and links to other sites for better plant ID. I will be taking more photos over the summer and posting but I will also be working on these pages as I have time.
A while after the hay was cut in 2020, I noticed a few plants growing in the hayfield trying their best to grow, flower, and go to seed before the season was over.
I have enjoyed photographing and learning about the many wildflowers growing on the farm and other areas. My farm is in Windsor, Missouri in Pettis County (Henry County is across the street and Benton and Johnson aren’t far away). I have grown over 500 different plants and most have pages listed on the right side of the blog. 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 horticulturalist I contact if I cannot figure them out. Wildflowers can be somewhat variable from location to location, so sometimes it gets 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 email@example.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)
WORLD FLORA ONLINE (GENUS/SPECIES)
FLORA OF NORTH AMERICA (GENUS/SPECIES)
USDA PLANTS DATABASE
MISSOURI BOTANICAL GARDEN
MISSOURI DEPARTMENT OF CONSERVATION
ARKANSAS NATIVE PLANT SOCIETY
KANSAS WILDFLOWERS AND GRASSES
KANSAS NATIVE PLANTS
NORTH CAROLINA STATE UNIVERSITY
PFAF (PLANTS FOR A FUTURE)
LADY BIRD JOHNSON WILDFLOWER CENTER
FRIENDS OF THE WILDFLOWER GARDEN
OZARK EDGE WILDFLOWERS
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 (and if they update their sources or even read what they say). 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. 🙂