Silphium
Theophrastus. Enquiry into plants and minor works on odours and weather signs, with an English translation by Sir Arthur Hort, bart (1916). Volume 1 (Books I–V) and Volume 2 (Books VI–IX) Volume 2 includes the index, which lists silphium (Greek σιλϕιον) on page 476, column 2, 2nd entry.