H. citrina thunbergii

Easily as tall as H.citrina vespertina, in fact the two look almost identical except that H citrina thunbergii blooms later than H. citr vesp. This feature extends the bloomtime of these tall types significantly. Besides the bloomtime there is not a lot of difference between the two. But if you like tall daylily species this one is a definate must have as it is just a bit different than the rest