Participant Info

Species

Elodea bifoliata [Elodea longivaginata]

Family

Hydrocharitaceae

CommonName

twoleaf waterweed

Presence

YES

Status

native

EarliestDate

1990

LatestDate

2020

Ecosystem

aquatic, basin, montane

Geobotanical

SSanjuans, UBasin

Counties

Conejos, Rio Grande

Passes

WildlifePreserves

Other Localities

PhotoRecords

YES Richard Haswell: Home Lake E of Monte Vista, submerged and floating 24 Sept 2020

Comments

There is only one herbarium voucher of Elodea befoliata from the Watershed: from a Lower Silver Lakes pond 5.15 miles W of Terrace Reservoir (Conejos Co, 1990). In addition there are two photorecords: from Home Lake just east of Monte Vista (Rio Grande Co, 2020) and from Million Reservoir (Rio Grande Co, 2020). Heil et al. (2013) say E. bifoliata is more common than E. canadensis in the USA, but it seems the reverse is true in the Watershed. E. bifoliata is recorded from Rio Arriba and Sandoval counties of New Mexico but no farther down the Rio Grande drainage. Its USA range consists of very scattered locations in all Western and upper Great Plains states.

Annotation