⚠ Version 1 of The Plant List has been superseded.

This name record (from Tropicos) is not included in version 1.1 of The Plant List. It is possible the same name is included from a different data source, to check this you can search for Philonotis calcarea in version 1.1 of The Plant List.

Philonotis calcarea f. occidentalis Flowers is a synonym of Philonotis americana f. occidentalis (Flowers) Grout

This name is a synonym of Philonotis americana f. occidentalis (Flowers) Grout.

The record derives from Tropicos which reports it as a synonym (record 35184478) with original publication details: Moss Fl. N. Amer. 2: 179. pl. 70: I 179 1935.