Hi all, especially Kev,
There is considerable confusion over these two genera. The genus Miltonia was described first, Miltoniopsis (meaning like a little Miltonia) later. Both honored the same guy--surname Milton. Unfortunately, I don't recall much about him. I *believe* he was someone who financed orchid collection expeditions in the early days of orchid collecting, but I may be wrong.
Anyway, Miltonia are primarily Brazilian in origin, Miltoniopsis are primarily Columbian. The latter tend to grow at higher elevations and are, therefore, cooler growing. I'm sure you know this already, but I just wanted to do a recap in case.
The problems began when subsequent taxonomists started applying Miltoniopsis to Miltonia species (and possibly vice versa). I actually don't understand how this happened--to my eyes, the flowers are *not* that much alike. Miltoniopsis, of course, are the classic pansy-orchids. Most Miltonia flowers look far more like Oncidiums in shape, than they do like Miltoniopsis. (Miltonia spectabilis, the best known Miltonia species, is the most Miltoniopsis-like of them.) Indeed, many taxonomists today argue that there aren't sufficient differences between Miltonia & Oncidium to maintain them in separate genera. (<insert groan> Just what we need, MORE species in Oncidium! LOL) I will say the colors of Miltonia are closer to Miltoniopsis than to Oncidium.
Once the initial confusion had set in, it was exacerbated by the hybridizing craze. With so much confusion, Miltoniopsis got used for all the hybrids, even if the hybrids had no true Miltoniopsis origin.
The AOS is starting to dealk with this and have proposed some new genera names for the intergenerics. I don't believe they have implemented them yet, but one of the proposed ones will affect many of the plants I know as Burrageara (Stefan Isler, Nelly Isler & Living Fire). Currently, it is considered to be the result of four genera: Cochlioda, Miltoniopsis, Odontoglossum & Oncidium. To differentiate between those of true Miltoniopsis origin vs. those with Miltonia origin, the new genus Kunthara is proposed. If accepted, the 3 grexes I mention in this paragraph will be known as Kunthara (ugh), rather than Burrageara. BTW, off the top of my head, I can't recall if Kunthara will be for those of Miltonia origin, or Miltoniopsis origin. (I *believe* the former.)
If the AOS goes ahead & recognizes the differences, I believe the new bigeneric of Miltonia & Miltoniopsis will be Milmiltonia, rather than Miltoniopsis. Yikers!
As an aside, the term "warm-growing Miltonia" is redundant whereas "cool-growing Miltonia" is incorrect from the strict botanical point of view.
Hope this is at least somewhat helpful.
Cheers,
Rob





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