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Rush family
Juncaceae
イグサ科
A family including rushes (Juncus), woodrushes (Luzula), and related genera. Widely distributed in wetlands, grasslands, and mountains, with about 100 species native to Japan. Best known for the soft rush used in traditional tatami mats. Flowers are wind-pollinated with six reduced, inconspicuous tepals.
Key Characteristics
- ●Stems are cylindrical, hollow or filled with pith
- ●Six tepals, inconspicuous brown to green flowers
- ●Wind-pollinated with abundant pollen production
- ●Leaves are cylindrical or flat, with leaf sheaths
Morphological Traits
A family may include species with different trait values — multiple values indicate the range within the family.
Leaf arrangement
Alternate
Leaf type
Simple
Venation
Parallel
Leaf margin
Entire
Growth form
Shrub / Herb
Evergreen/Deciduous
Deciduous
Leaf dissection
Undivided
Stipules
Present / Absent
Flower symmetry
Actinomorphic
Petal count
3 petals / 6 petals
Petal fusion
Free
Ovary position
Superior
Plant sex
Dioecious / Hermaphrodite
Phylogenetic Position
Angiosperms > Monocots > Poales > Juncaceae
Divergence Era
Late Cretaceous to Paleogene
Representative Genera
Related Evolution Events
- ・Adaptation to dry, open environments through tepal reduction and shift to wind pollination
- ・Establishment of a broad ecological range from wetlands to alpine zones
Plants in Rush family on this site
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