Cryptantha pterocarya (Torrey) Greene

Pronunciation:
Cryp-tán-tha pte-ro-cà-ry-a
Etymology:
"wing nut"

[Cryptantha s.s. HOME]


Revised Key:
(After: Mabry, M. E., R. A. Dowdy, L. M. Simpson, J. P. Rebman, and M. G. Simpson. 2016. Taxonomy of the winged popcorn flower: Cryptantha pterocarya (Boraginaceae). Phytotaxa 253: 97-130.

   At least some nutlets with marginal wing encircling entire nutlet body, including base; nutlets homomorphic with all 4 winged (forma cycloptera),
      or heteromorphic with odd nutlet having reduced wing at sides and base (forma truncata) ............................... C. cycloptera [C. pterocarya var. cycloptera]

   
All nutlets lacking a marginal wing at base of nutlet body, nutlets homomorphic or heteromorphic

      At least some nutlets with prominent, apically lobed or toothed wings >0.6 mm wide; nutlet body 1.8–3.2 mm long

         Calyx body in fruit ovoid, 3–4(6) mm long, sepals lance-ovate to lanceolate (length:width ratio 2–4); nutlets heteromorphic with one nutlet unwinged
            (forma pterocarya) or homomorphic with all four nutlets winged (forma pseudocycloptera), nutlet body generally 1.8-2.8 mm long, wing width of
            consimilar nutlets 0.6 mm and greater ........................................................................................................................ C. pterocarya var. pterocarya

         
Calyx body in fruit lance-ovoid, 5–8 mm long, sepals lanceolate (length:width ratio 3–5); nutlets heteromorphic, the odd nutlet unwinged,
            nutlet body generally 2.8-3.2 mm long ......................................................................................................................... C. pterocarya var. stenoloba

      
At least some nutlets with narrow, lobed or toothed wings <0.6 mm wide, or with narrow, linear, marginal rim; nutlet body 1.2-2.2 mm long
         ...................................................................................................................................................................................... C. pterocarya var. purpusii



See also: Johnston, I. M. 1925. Cryptantha pterocarya. In: The North American species of Cryptantha. Pp. 51-54. Cambridge, Massachusetts.

Kartesz, J.T., The Biota of North America Program (BONAP). 2012. North American Plant Atlas (http://www.bonap.org/MapSwitchboard.html).
Chapel Hill, N.C. [maps generated from Kartesz, J.T. 2010. Floristic Synthesis of North America, Version 1.0. Biota of North America Program (BONAP). (in press)].
COLOR KEY: Dark green=present in state; Light green=present in county, not rare.