| Name | Lophotocarpus calycinus var. spongiosus (Engelmann) Fassett | 
| Authorship | (Engelmann) Fassett | 
| Rank | Variety | 
| Placed in | Lophotocarpus calycinus (Engelmann) J. G. Smith | 
| Citation | 1922 Rhodora 24: 73 | 
| Holdings | 2 Specimens held in the Harvard University Herbaria identified as Lophotocarpus calycinus var. spongiosus (Engelmann) Fassett | 
| Identification made in | [no date] (2) |