"K" was a bit tricky to figure out. So far this morning I came up with...
Kinnebrew, these are the only two cultivars I still have. A few years ago I lost clumps of many of their cultivars after a long, very cold, winter with no snow cover.
Kirchhoff, David's plants have always done well for me. Dragon King is an oldie but goodie with heavy substance and gorgeous color.
A few favorite cultivars that begin with "K"...
Patterned daylilies with kaleidoscope in their name. The stippled...
and those wonderful multicolored eyes...