Amsonmia tabernaemontana
The only thing I dislike about this plant is the pronunciation of the species. My review will be based on the 20 or so plants from last year. Do not be discouraged if the leaves yellow and drop. They have not perished! The following spring every one came to life looking beautiful. To get a fuller and busier plant, I trimmed the top third of the plant. (Don't forget to water occasionally even though it is leafless).