This was purchased as Dendrobium guerreroi , division of 'CC9607' from Troy Meyers (TN6874), but I'm guessing that this is actually D. ionopus . Troy, who is great at keeping records, told me that he purchased this plant from Tropical Orchid Farm in April 15 1996 (TOF's original tag: F2064 Dendrobium guerreroi x sib). It is great to keep the record straight; history of plants are lost most of the time since people don't keep good record! Thank you, Troy! Indeed, The Dendrobium by H. P. Wood (p.645) mentions that some plants of D. ionopus imported from Philippines were incorrectly identified as D. guerreroi . Both of these species belong to Section Calcarifera, a section with 50-60 species. Species epithet of D. ionopus means "violet", which refers to the purple marking (dots) at the base of lip on flowers and the young leaves with purple stripes. Mine lacks this purple dots on the flower, and I haven't noticed purple stripe...
Plants, Orchids, and Life in North