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Parthenium hysterophorus
Santa Maria feverfew Aster Family
Parthenium hysterophorus Asteraceae
common names
  Santa Maria feverfew
  ragweed parthenium
  whitetop weed
accepted scientific name
  Parthenium hysterophorus L.
rules for finding collection records
  Parthenium hysterophorus (563)
  exclude Parthenium hysterophorus lyratum
family name
Image Author: ©2013 Forest And Kim Starr
Image License: CC BY
Image Source Image Source
Category: Wildflowers
Flowers: No obvious petals
Petal colors: color
Leaf: Alternate
Plant Observed All Year

How Likely at this Location (19%)
Name Match (100%)
Plant Showiness (36%)
base map where plant found
mag select

grid lines base