SALVINIACEAE.
Azolla caroliniana (Willd.) “Ponds from Henderson and Peoria counties southward. Infrequent.” (P.) “Since 1857 not found again in the region of our local flora.” Brendel in Flora Peoriana. “In a pond near South Chicago, 1886. So far as known this is the only locality where this species has been found within our limits.” Higley and Raddin.