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Water-milfoil family
Haloragaceae
アリノトウグサ科
A family of about 8 genera and 145 species including Gonocarpus and Myriophyllum, comprising terrestrial to aquatic herbs. In Japan, Gonocarpus and Myriophyllum species are present. Aquatic species have finely pinnately dissected leaves adapted to reduce water resistance.
Key Characteristics
- ●Herbs (terrestrial to aquatic)
- ●Aquatic species have finely pinnately dissected leaves adapted to submerged life
- ●Flowers small, wind- or water-pollinated
- ●Petals 4 or reduced and absent
- ●Fruits are nutlets or drupe-like
Morphological Traits
A family may include species with different trait values — multiple values indicate the range within the family.
Leaf arrangement
Alternate / Opposite / Whorled
Leaf type
Simple / Compound
Venation
Pinnate
Leaf margin
Serrate / Dentate / Entire
Growth form
Herb
Evergreen/Deciduous
Deciduous
Leaf dissection
Dissected / Undivided
Stipules
Absent
Flower symmetry
Actinomorphic
Petal count
4 petals
Ovary position
Inferior
Stamen count
3-4
Plant sex
Hermaphrodite / Monoecious
Phylogenetic Position
Angiosperms > Eudicots > Core eudicots > Saxifragales > Haloragaceae
Divergence Era
Late Cretaceous to Paleogene
Representative Genera
Related Evolution Events
- ・Secondary adaptation from terrestrial to aquatic habitats (pinnate leaf dissection)
- ・Dispersal from a Gondwanan Southern Hemisphere distribution to the Northern Hemisphere
Plants in Water-milfoil family on this site
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