Thanks for the pre-search of this. Very helpful to find this here. One question though. Where the trade name Autumn Sun is I expect to see the 'Herbstsonne' cultivar name. Is it just standard throughout the database to have the trade name, if there is one, there instead? I have seen it on ATP elsewhere once but now twice and am curious....?

Yes the Trade Name, where one exists, will be displayed in lieu of the cultivar name. Carnation (Dianthus caryophyllus SuperTrouper™ Silver Pink) is a good example of why we do it that way. The cultivar name is 'KLEDP07093', and we see that cultivar names are often not listed on the plant tag. Instead the Trade name (Trade designation) is. This is fairly common today. Typically a trade name will trademarked or, as in the Dianthus example, the series will be.

In the case of Rudbeckia 'Herbstsonne', since Autumn Sun is either a newer, and therefor invalid, cultivar name or a non-trademarked trade designation, I'm going to move it to the Also sold as field.

Thanks you for the explanation Evan. I manage a small database for the Hamilton Square Perennial Garden. An inventory more or less and am using the ATP data base to keep it current as far as the correct/newest binomials and to ID some unknowns. Always more to learn. Thanks again.

You're welcome Leslieray.