I don't keep up with every detail regarding Cycas species because to me, many look the same and also, here in Florida, the Asian scale has destroyed about a billion $s worth of sagos in the last 10 years. Most of them don't look impressive, and I wouldn't want to invest in any just for sale because around here, nobody will buy them. I have limited my collection as much as possible to other species that don't get the scale. However, I have to admit a liking for all the split leaflet cycas species. I have collections of breeding micholitziis and what might be my new favorite cycad, Cycas debaoensis. I also have plants of C. bifida, and the plants known as C. mulitfrondis (even though they are not considered a true species)
As far as information on all the VN Cycas species, I can't tell you much, but I do know where to find that information. Roy Osbourne wrote a really nice looking book with lots of pictures just on the Cycas of VN. He really needs to be getting rid of them and has made them as cheap as $10 if you buy 5 at a time. I do not have that book yet, so I can't quote you any of the information, but if you are one of the people who are able to travel to such places, it may be a very helpfull book. For that matter, if you go back, you could try to contact someone like Heip (from the book) and he might be able to go out and show you plants.
I can tell you though that micholitziis are in NVN on the border. The Montgomery BC had an expedition to that area and found the plants and brought back material about 15 years ago.
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