. The Canadian field-naturalist. Natural history. 1997 Reddoch and Reddoch: The Orchids in the Ottawa District 127 Platanthera huronensis (Nuttall) Lindley Fragrant Green Orchid Platanthere de la Huronie Synonyms: Platanthera hyperborea (Linnaeus) Lindley var. huronensis (Nuttall) Luer, Platanthera x media (Rydberg) Luer, Habenaria hyperborea (Linnaeus) R. Brown var. huronensis (Nuttall) Farwell The taxon referred to here as Platanthera huronensis has been considered by Luer (1975) and others to be a puta- tive hybrid between P. hyperborea and P. dilatata. Schrenk (1978) suggested that the hyb
. The Canadian field-naturalist. Natural history. 1997 Reddoch and Reddoch: The Orchids in the Ottawa District 127 Platanthera huronensis (Nuttall) Lindley Fragrant Green Orchid Platanthere de la Huronie Synonyms: Platanthera hyperborea (Linnaeus) Lindley var. huronensis (Nuttall) Luer, Platanthera x media (Rydberg) Luer, Habenaria hyperborea (Linnaeus) R. Brown var. huronensis (Nuttall) Farwell The taxon referred to here as Platanthera huronensis has been considered by Luer (1975) and others to be a puta- tive hybrid between P. hyperborea and P. dilatata. Schrenk (1978) suggested that the hybrid may be, in fact, a hybridogenic new species. Plants referable to P. huronensis as described by Charles Sheviak (personal communi- cation 1996) occur in several Ottawa District fens, and it is these plants ihat we describe below. Both P. huronen- sis and P. hyperborea can be distinguished from our other Platantheras by their several cauline leaves and numer- ous small, greenish flowers (not pure white as in P. dilatata) with entire lips comparable in size to the spurs. In the Ottawa District, P. huronensis can be distinguished from P. hyperborea by its open sedge fen habitat (rarely in swamps), and its larger, light green flowers with a distinct rose-like fragrance. The two species can also be separated by differences in the orientations of the anther sacs in the column (Paul Catling, personal communica- tion 1994). See Further Diagnostic Notes below and the P. hyperborea account following. Description Height: 27 (39 - 70) 91 cm [56 plants]. Flowers: 12 - 105 [24 plants]; light green (but not white) in the field; under the microscope, colours darker but not as dark as P. hyperborea; dorsal sepa- ls green or yellowish green with some readings of light green or greyish green, lip, spur and petals greyish green, usually lighter than the sepals, edges of petals white; (lighter measurements in the field may be the result of surface light-scattering effects); arranged in moderatel
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