Abstract
Several types of pollinium stalk are present in theCorallorhizinae. Govenia has a cellular epidermal pollinium stalk, whileTipularia has a unique stipe that results from prolongation and detachment of the rostellum.Dactylostalix andEphippianthus have no stipe, but do have a detachable viscidium.Aplectrum, Corallorhiza, Cremastra, andOreorchis have hamuli. Cladistic analysis of morphological characters suggests that these four genera form a “core”Corallorhizinae, and are sister group to a clade includingTipularia, Calypso, andYoania (the latter two possessing a true tegula).Govenia is shown to be most closely related to cymbidioid genera (such asEulophia), sharing with them the cellular epidermal pollinium stalk andCymbidium type velamen, and indicating that removal ofGovenia fromCorallorhizinae is appropriate.Dactylostalix andEphippianthus appear to occupy a more basal position in the subfamily, further arguing that the subtribe as previously recognized is paraphyletic.
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Freudenstein, J.V. Gynostemium structure and relationships of theCorallorhizinae (Orchidaceae: Epidendroideae). Pl Syst Evol 193, 1–19 (1994). https://doi.org/10.1007/BF00983537
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DOI: https://doi.org/10.1007/BF00983537