Not an accepted name (status: unknown). The accepted name is Callitriche terrestris Raf., 1808.

Callitriche terrestris subsp. subsessilis (Fassett) Bacig., 1979 2% complete

No common name

in Fl. Ilustr. Entre Ríos, 5: 577, 1979

There is no corrections for Callitriche terrestris subsp. subsessilis yet.