It is known from three sites in Turkey, but remains poorly known, also as regards its taxonomy.

In Catalonia, the species is known from six sites, ranging from sea level to 1200 m (3900 ft) altitude.

This period is known from 68 archaeological sites in 29 localities.

This species is known from only two sites in Chile.

Prior to 1990, the least darter was known from 31 sites in 10 streams and 9 lakes scattered across the southern three-fourths of the state.

Skeleton finds in the United Kingdom are known from only a few sites.

It is now known from only two sites in the province of Ontario.

It is now known from seven sites.

The plant is now only known from eight sites, with most individuals located on one site in Miami-Dade County.

It is known from only 27 sites, all occurring east and northeast of Walpole.