This northeastern taxon of wet woods and thickets (F) has been reported from BELL or KNOX by Treiber (1980), perhaps based on a coll. at GH, and K (in progress) has mapped other records from e. Ky. However, no clearly verified colls. have been located. In Tenn., the only verified records may be from higher elevation at the northeast corner of that state (Carter & Johnson Cos.), based on an initial review of data from K (in progress) and SERNEC (2024). Based on W, stewardsonii differs from pusilllum as follows: spathe tube strongly fluted (versus not so, rarely weakly fluted); spathe hood green with white or purple stripes (versus solid green or solid purple).