Distribution: Occurring east of the Cascades crest in Washington; Washington to California, east to Montana, Wyoming, and Utah.
Habitat: Ponds and marshes, in wet depressions in sagebrush and less commonly on river margins.
Spores: June-October
Origin: Native
Growth Duration: Perennial
Conservation Status: Not of concern
[none provided]
PNW Herbaria: Specimen records of Marsilea oligospora in the Consortium of Pacific Northwest Herbaria database
WA Flora Checklist: Marsilea oligospora checklist entry
OregonFlora: Marsilea oligospora information
E-Flora BC: Marsilea oligospora atlas page
CalPhotos: Marsilea oligospora photos