We got this perennial African species from Mr. Impatiens, Derick Pittman. Nice pink flowers on numerous stems to 3'. He says it has shown unexpected hardiness to zone 8 but we have not yet trialed it outside, but when we do, we will mulch the heck out of it. To be safe, overwinter a chunk in a cool greenhouse or garage in the fall.
An uncommon tuberous species from South Africa where it is rare in the wild and getting rarer from human pressure. This Dahlia hardy here in the Northwest so can be left in the ground if the drainage is good and you are kind enough to mulch it in the winter. Big leaves, reddish stems and pink flowers with a long spur.
An introduction of this hardy zone 7 rhizomatous species by Bjornar Olsen from Sichuan. Small flowers generously produced are a nice taupe infused with the palest pink blush and further accentuated by vivid pink specks and lines on the exterior. The yellow and orange throat carries these same specks and lines.
An awesome - and I don't use this word lightly - hardy Impatiens from Africa. John Grimshaw in the UK speaks highly of this species. To 6' tall in morning sun or light shade with awesome (there i go again) 3" wide flat-faced white flowers with a red throat. Gorgeous. Perennial big tuberous roots. Not a seeding thug.