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Sunflower🌻
Helianthus annuus
ヒマワリ
An annual herb native to North America, reaching 1-3 m in height, characterized by its large yellow capitula. The seeds are used for food and oil production. Commonly cultivated in school gardens and farmland.
Identification Points
- ✓Large yellow flower head (actually a composite of many small florets = capitulum)
- ✓Young flower heads track the sun (heliotropism)
- ✓Stems covered in coarse hairs
- ✓Leaves are large and heart-shaped
Habitat
Fields, flower beds, roadsides
Season
July to September (flowers)
Morphological TraitsAI-estimated, needs verification
Leaf arrangement
Alternate
Leaf type
Simple
Venation
Pinnate
Leaf margin
Serrate
Leaf shape
Cordate
Growth form
Herb
Petal count
5 petals
Petal fusion
Fused
Flower color
Yellow
Flowering season
Summer
Habitat
Cultivated
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