Conyza canadensis

Common Name: 
horseweed, mare's-tail
Scientific Name: 
Conyza canadensis (L.) Cronq.    syn.  Erigeron canadensis
Family Name: 
Asteraceae (Compositae) - Aster or Sunflower Family
Identification Notes
Life Cycle
native winter or summer annual, reproducing by seed
Stems
reproductive, upright, tall, very leafy, hairy, branched above
Stems of Horseweed
Stems of Horseweed
Stems of Horseweed
Stems of Horseweed
Stems of Horseweed
Leaves
alternate, linear, hairy, toothed margins or sometimes entire, rosette initially, small above, crowded, sessile
Leaves of Horseweed
Leaves of Horseweed
Leaves of Horseweed
Flowers
heads of white (sometimes very light pink) ray (ligulate) florets and yellow disk (tubulate) florets in center
Flowers of Horseweed
Flowers of Horseweed