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Umbrella Sedge
Cyperus microiria
カヤツリグサ
A common annual herb found throughout Japan in moist wastelands and waterside areas. From summer to autumn, it produces radiating branch-like spikelets at the stem apex. The triangular stem cross-section is a characteristic diagnostic feature of the sedge family.
Identification Points
- ✓Stem triangular in cross-section
- ✓Bracts and branches radiate from the stem apex
- ✓Forms colonies in moist habitats
Habitat
Rice paddy margins, wetlands, roadsides, and wastelands
Season
July–October (inflorescence)
Morphological TraitsAI-estimated, needs verification
Leaf arrangement
Alternate
Leaf type
Simple
Venation
Parallel
Leaf margin
Entire
Leaf shape
Linear
Growth form
Herb
Petal fusion
No petals
Habitat
Wetland
Petal count
6 petals
Leaf dissection
Undivided
Ovary position
Superior
Phylogenetic Positionカヤツリグサ科 →
Phylogenetic Position
Angiosperms > Monocots > Poales > Cyperaceae
Divergence Era
Late Cretaceous to Paleogene (about 80–70 million years ago)
Evolution Notes
Cyperaceae is a monocot family closely related to Poaceae, having adapted to wetland environments and spread worldwide. The triangular stem is an iconic trait of this family.
View on evolution timeline →Sources & References
AI-generated, needs verification