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Annual Fleabane🌼
Erigeron annuus
ヒメジョオン
An introduced species from North America. An annual or biennial herb that produces numerous small white flowers from spring to autumn. Commonly found along roadsides and in vacant lots. Often confused with the similar Erigeron philadelphicus.
Identification Points
- ✓Stem is solid in cross-section (E. philadelphicus has a hollow stem)
- ✓Cauline leaves do not clasp the stem (E. philadelphicus leaves clasp)
- ✓Ray florets are white and narrow
- ✓Buds are held upright (E. philadelphicus buds droop)
Habitat
Roadsides, vacant lots, grasslands
Season
May to October (flowers)
Morphological TraitsAI-estimated, needs verification
Leaf arrangement
Alternate
Leaf type
Simple
Venation
Pinnate
Leaf margin
Serrate
Leaf shape
Ovate
Growth form
Herb
Petal count
5 petals
Petal fusion
Fused
Flower color
White
Habitat
Roadside
Ovary position
Inferior
Stamen count
1-2
Phylogenetic Positionキク科 →
Phylogenetic Position
Angiosperms > Eudicots > Core eudicots > Asterales > Asteraceae
Divergence Era
Late Cretaceous to Paleogene (approx. 80–70 million years ago)
Sources & References
AI-generated, needs verification