https://weedid.missouri.edu/weedinfo.cfm?weed_id=403
Hoary Puccoon // Mizzou WeedID
Weed ID Guide, Weed Science Program
hoary puccoonmizzou
https://fieldguide.mt.gov/ObsChart_FS.aspx?elcode=PDBOR0L070
Narrow-leaved Puccoon - Obs. by Month - Montana Field Guide
Montana Field Guide contains a wealth of information about Montana's diverse species.
by monthnarrowobsmontanafield