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Description

Silphium perfoliatum

Date

1913

Source

An illustrated flora of the northern United States, Canada and the British Possessions. Courtesy of Kentucky Native Plant Society.

Author

Nathaniel Lord Britton (1859-1934), and A. Brown

Permission
(Reusing this file)

The author died in 1934, so this work is in the public domain in its country of origin and other countries and areas where the copyright term is the author's life plus 80 years or fewer.

This work is in the public domain in the United States because it was published (or registered with the U.S. Copyright Office) before January 1, 1929.

This file has been identified as being free of known restrictions under copyright law, including all related and neighboring rights.