Corallorhiza maculata var. occidentalis was first described by Lindley (1840) as variety of C. multiflora. Cockerell (1903) proposed a new species called Corallorhiza grabhamii and Suksdorf (1906) did the same with a similar discovery naming it C. leimbachiana. Both names were neglected. Cockerell (1916) later proposed a subspecies Corallorhiza maculata subsp. occidentalis but finally Ames (1924) subsumed all proposed names with the variety Corallorhiza maculata var. occidentalis which is the accepted name until today (WCSP). It occures from the west to the northeast of the United States of America (POWO). It often occures together with C. maculata var. maculata and can be distinguished by its earlier flowering of nearly 3 weeks and a that the middle lobe of the labellum is distinctly expanded and floral bracts are in average longer than 1.5 mm. From the variety C. maculata var. mexicana it can easlily be identified by the labellum which is throughout spotted in the expanded portion of mid-lobe, while the other is primarily spotted at the margins.
Corallorhiza maculata var. occidentalis (Lindley) Ames 1924
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