Hi Roberto,
I have seen some Black Jack sans in a local nursery. I am in Georgia, in the southern US. It appeared to be a form of Black Gold. It was a medium height, but very chunky and robust. More so than any Black Gold type I have seen. I would have bought one, but the plants had been poorly shipped and seemed to have some kind of leaf spot disease.
We have discussed Kristi here recently. It may be a form of Goldflame, at least it is very similar.
Those black and white patent photos are so poor, they will be of little help.

thanks, bmock. In the meanwhile, I contacted Florica Farms and they kindly replied that their plants are distributed by Charlie Cook . In their site (charlie-cook .com) there are good pics of each cultivar. Nice plants, indeed. I would like to have one...

I would love to get Whitney and Black Jack...stunning! What are the best sources for hobby growers to obtain cultivars like these? I see them on wholesale growers' lists, but most of them do not appear to do business on a retail level.

Vivaria,
I got my Whitney from Hirt's Gardens via Amazon.
Fred

I actually have 73 different cv of trifasciata, ready for exchange with US collectors. Up to now, I received no requests...

roberto2 I think we are drooling at your offer but have nothing to offer in exchange!! If you already have 73 cultivars, you probably have everything we already have and a few dozen more. I would certainly love to see more of what you have! -Chris (Woodnative)

Thanks to all for your responses! Due to the generosity of two members from the forum, I now have Whitney, Midnight Shine, Streaker, Silver Frost, Siebert, and Gold Flame! I'm very excited to have them in my collection. Still maybe nothing Roberto doesn't have... : )

Here is a list of what I am looking for:

Kristi
Slipped stripes
Sunrise (Sunshine)
Assalam
Herminia
Hendrika
Becky
Golden Street
Gold America
Gold Banner
Sheri
Yellow Thrift
There are US nurseries that sell more interesting cultivars, but they don't ship overseas. I will send You some more names...

Is there any information on the availability of these cultivars in the EU already? That Winter Green is stunning! Thank you.