Silphium (genus)

Silphium is a genus of North American plants in the sunflower tribe within the daisy family.

Members of the genus, commonly known as rosinweeds, are herbaceous perennial plants growing to 0.5–4 m tall, with yellow (rarely white) flowerheads. The name of the genus comes from the Ancient Greek word for a North African plant whose identity has been lost, though it is known its gum or juice was prized by the ancients as a medicine and a condiment.

1. Silphium albiflorum A.Gray – white rosinweed – TX
2. Silphium asteriscus L. – starry rosinweed – TX OK LA AR MO IL IN KY TN AL MS GA FL SC NC VA WV OH MD PA NY
3. Silphium brachiatum Gatt. – Cumberland rosinweed – TN AL GA
4. Silphium compositum Michx. – kidneyleaf rosinweed – TN AL GA FL SC NC VA WV
5. Silphium glutinosum J.R. Allison AL
6. Silphium integrifolium Michx. – wholeleaf rosinweed – NM TX LA OK AR MO KS CO WY SD NE IA IL IN KY TN MS AL WI MI MA ONT
7. Silphium laciniatum L. – compassplant – NM TX LA OK AR MO KS CO SD NE MN IA IL IN KY TN MS AL WI MI VA PA NY ONT
8. Silphium laeve Hook. – WA ID
9. Silphium mohrii Small – Mohr's rosinweed – TN AL GA
10. Silphium perfoliatum L. – cup plant – NM TX LA OK AR MO KS CO SD ND NE MN IA IL INKY TN MS AL WI MI NC VA DE PA NY NJ CT RI MA VT NH ME ONT QUE NB
11. Silphium perplexum J.R.Allison – Old Cahaba rosinweed – AL
12. Silphium pinnatifidum Elliott – Cutleaf prairie dock – AL GA KY TN
13. Silphium radula Nutt. – roughstem rosinweed – KS MO AR OK TX LA
14. Silphium terebinthinaceum Jacq. – prairie rosinweed, prairie dock – IA MO AR MS AL GA SC NC VA WV TN KY OH IN IL WI MI NY ONT
15. Silphium ternatum Sessé & Moc. – Mexico
16. Silphium trifoliatum L. – whorled rosinweed – AL GA IN KY MD NC SC OH PA VA WV
17. Silphium wasiotense M.Medley – Appalachian rosinweed – KY TN

numerous species now regarded as members of other genera: Berlandiera Verbesina