Single Record
Participant Info
- Species
- Glyceria grandis [Glyceria arundinacea subsp. grandis] [Glyceria maxima subsp. grandis] [Panicularia grandis]
- Family
- Poaceae
- CommonName
- American mannagrass, reed mannagrass
- Presence
- yes
- Status
- native
- EarliestDate
- 1873
- LatestDate
- 2025
- Ecosystem
- basin, foothill, montane, ruderal, urban
- Geobotanical
- Garitas, SSanjuans, NCristos, UBasin, LBasin
- Counties
- Alamosa, Conejos, Costilla, Mineral, Rio Grande, Saguache
- Passes
- WildlifePreserves
- Baca, Monte Vista
- Other Localities
- Alamosa (town), Del Norte
- PhotoRecords
- YES Richard Haswell: Rio Grande Co, side channel of the Rio Grande, Del Norte river walk 31 July 2025
- Comments
- American mannagrass (native to the USA and introduced in Europe) grows in moist Watershed habitats—alongside creeks, rivers, ponds, and irrigation canals. In seasonal conditions, it can grow in the water. Glyceria grandis, perennial and cool-season, has been vouchered fairly often from the Watershed, from both basins and from the San Juans and the Cristos at lower elevations. It is the largest of the four mannagrasses in the Valley. The USA distribution is extensive, across the entire northern third of the nation and down the Rockies to Colorado and New Mexico. The species follows the Rio Grande drainage through most of New Mexico but not into Texas.
- Annotation