Native Plants
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Wolffia arrhiza
Wolffia arrhiza (L.) Horkel ex Wimm.
Spotless Watermeal
Lemnaceae (Duckweed Family)
Synonym(s):
USDA Symbol: WOAR2
USDA Native Status: L48 (N)
From the Image Gallery
No images of this plant
Plant Characteristics
Duration: PerennialHabit: Herb
Size Notes: Floats on the surface of the water.
Fruit: Utricle.
Bloom Information
Bloom Color: GreenBloom Time: May , Jun , Jul , Aug
Bloom Notes: Flowers are rare and inconspicuous, lacking sepals and petals. Plant also reproduces vegetatively.
Distribution
USA: CANative Distribution: Several sources say this species is naturalized in California. Calflora describes it as native.
Growing Conditions
Aquatic: yesNational Wetland Indicator Status
Region: | AGCP | AK | AW | CB | EMP | GP | HI | MW | NCNE | WMVE |
Status: | OBL |
Web Reference
Webref 30 - Calflora (2018) CalfloraWebref 38 - Flora of North America (2019) Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA.
Webref 36 - Jepson eFlora (2019) The Jepson Herbarium, University of California, Berkeley
Additional resources
USDA: Find Wolffia arrhiza in USDA PlantsFNA: Find Wolffia arrhiza in the Flora of North America (if available)
Google: Search Google for Wolffia arrhiza
Metadata
Record Modified: 2023-04-10Research By: TWC Staff