Registered by Madelon Gilligan of New Zealand in 2017, this upright growing cultivar is a small size (8 inches high by 20 inches wide) seedling of H. 'Let's Streak'. The dark green leaves have a creamy white marginal variegation. They are broadly ovate, deeply wavy, heavily rippled and slightly shiny on top. The green and white coloration extends down into the petioles. Pale purple flowers with darker stripes bloom from June into July on scapes 17 to 21 inches tall followed by viable seeds.

The registration materials state: "...Bold contrasting colors, wide white edge and very upright posture...Contrast becomes more striking throughout the season."

Rosaleen is an Irish female first name. It is an Anglicized version of the Irish name Róisín, the diminutive of "rose" in the Irish language.