Rhynchospora stiletto Naczi & Ciafré. Stiletto Beaksedge. Phen: Jul-Aug. Hab: Fens, calcareous wet prairies, limestone river scour outcrops. Dist: Sc. TN to ne. AL; se. MO and adjacent ne. AR. It is only known from a small number of rare limestone-laden sites in central TN, ne. AL, se. MO, and ne. AR; further surveys are needed within its range.

ID notes:Rhynchospora stiletto appears to be closely allied to R. chalarocephala, and is distinguished primarily by its longer tubercle 2.3-2.7 mm long or 0.53-0.58× as long as the achene body (vs. 1.2-1.5 mm long or 0.39-0.48× as long as the achene body in R. chalarocephala).

Origin/Endemic status: Endemic

Taxonomy Comments: See Ciafré & Naczi (2022) for detailed discussion.

Synonymy: = Ciafré & Naczi (2022); = n/a – S, S13; < Rhynchospora chalarocephala Fernald & Gale – C, FNA23

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Wetland Indicator Status:

• Eastern Mountains and Piedmont: OBL (taxonomic split from wetland indicator species)
• Great Plains: OBL (taxonomic split from wetland indicator species)
• Northcentral & Northeast: OBL (taxonomic split from wetland indicator species)