| Name | Macrosiphonia longiflora (Desfontaines) Müller Arg. |
| Authorship | (Desfontaines) Müller Arg. |
| Rank | Species |
| Placed in | Macrosiphonia Müller Argoviensis |
| Holdings | 29 Specimens held in the Harvard University Herbaria identified as Macrosiphonia longiflora (Desfontaines) Müller Arg. |
| Identification made in | [no date] (24), 1966 (1), 1968 (2), 1988 (2) |
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