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Lanceleaf Tickseed🌼
Coreopsis lanceolata
オオキンケイギク
A perennial in the daisy family, native to North America. Introduced as an ornamental for its bright yellow flower heads, but it has spread so aggressively that it outcompetes native wildflowers. Designated as an Invasive Alien Species in Japan in 2006; cultivation, sale, and transport are now banned.
Identification Points
- ✓Bright yellow flower heads, 5–7 cm across
- ✓Mostly basal lanceolate leaves, entire or shallowly lobed
- ✓Plant height 30–70 cm
Habitat
Riverbanks, road slopes, vacant lots (invasive alien)
Season
May to July (flowers)
Morphological TraitsAI-estimated, needs verification
Leaf arrangement
Alternate
Leaf type
Simple
Growth form
Herb
Flower color
Yellow
Flowering season
Spring
Habitat
Grassland
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