A dark rufous morph, "neoxenus", termed "Cory's Bittern" or "Cory's Least Bittern" was originally described by Cory as a separate species in 1885, from a specimen collected on or near the Caloosahatchee River, near Lake Okeechobee, in southwest Florida; Cory stated that the specimen was "without doubt perfectly distinct from any other known species".
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Union commanders planned to send horse soldiers into the area north of the Caloosahatchee River to confiscate livestock from area cattle ranches, thereby preventing shipment of beef to the Confederate Army of the Tennessee in Georgia.