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Hydrangea🌸
Hydrangea macrophylla
アジサイ
The quintessential flowering shrub of the rainy season (tsuyu). Native to Japan, the flower color changes from blue to reddish-purple depending on soil pH. What appear to be flowers are mostly sterile decorative florets (enlarged sepals); the true flowers are the small ones in the center.
Identification Points
- ✓Large globular inflorescence (composed of many decorative florets)
- ✓Blue in acidic soil, reddish-purple in alkaline soil
- ✓Showy 4-sepaled sterile florets are conspicuous
- ✓Leaves are large and opposite
Habitat
Gardens, parks, temples and shrines, roadsides
Season
June to July (flowers)
3D Specimen Model
Kyushu University, Shikano Lab (CC0)
View on Sketchfab→Morphological TraitsAI-estimated, needs verification
Leaf arrangement
Opposite
Leaf type
Simple
Venation
Pinnate
Leaf margin
Serrate
Leaf shape
Ovate
Growth form
Shrub
Evergreen/Deciduous
Deciduous
Petal count
4 petals
Petal fusion
Free
Flower color
Blue
Stipules
Absent
Flower symmetry
Actinomorphic
Phylogenetic Positionアジサイ科 →
Phylogenetic Position
Angiosperms > Eudicots > Cornales > Hydrangeaceae
Divergence Era
Late Cretaceous to Paleogene
Sources & References
AI-generated, needs verification