There are 16 varieties of purple / lavender daylilies with slide shows below. Garden Show is my favorite purple daylily with its large flowers ... followed by Raspberry Suede with its deep burgundy color.  Black Stockings & Lavender Stardust are prolific bloomers.  Spacecoast Technical Knock Out has very pretty smaller blooms which can be stunning.

Garden Show
Raspberry Suede
Spacecoast Technical Knock Out
Black Stockings
Lavender Stardust ... rebloomed Aug 24 - Sep 14
Round Midnight
Mildred Mitchell
​Bluegrass Memories
Spacecoast Behavior Pattern
Gayle Palmer
Always Afternoon
Spiny Sea Urchin
Dare to Love
Daring Deception
Outrageous Lavender
Apparition

Garden Show - 8 plants, large 6 inch flowers, 28 inches tall, midseason, dormant,  bloomed - May 19 to Jul 11, 40 days with blooms, Spring Hill

Raspberry Suede - 3 plants, 5 inch flowers, 28 inches tall, midseason, dormant, blooms slow to open in morning, not a dynamic grower, only 3 or 4 blooms per scape,  scapes relatively weak, though love deep burgundy color, bloomed May 15 to May 30, 13 days with blooms, Spring Hill

Spacecoast Technical Knock Out - 1 plant, 4.75 inch flowers, 32 inches tall, midseason, semi-evergreen, only one scape (bloom stalk), small bloom but very pretty, bloomed May 24 to Jun 8, 8 days with blooms, Breck's

Black Stockings - 3 plants, 6 inch flowers, 24 inches tall, midseason, evergreen, dynamitic growing plants, lots of scapes & blooms, love the purple black color, bloomed May 10 to Jun 10, 29 days with blooms, K.van Bourgondien

Lavender Stardust - 5 plants, 5.5 inch flowers, 26 inches tall, midseason late, dormant, often multiple blooms open on the same day on a single scape, multiple scapes per plant, blooms produced shrink significantly in size when temps are in mid to upper 90s, bloomed May 18 to Sep 18, rebloomed, 66 days with blooms, Spring Hill

Round Midnight - 10 plants, 6 inch flowers, 30 inches tall, early midseason, evergreen, bloomed May 31 to Jul 5, 32 days with blooms, first year for Gilbert Wild (planted on Mar 6) plants have much thinner petals (spider like) but which open in a prettier consistent manner, Springhill, Gilbert Wild

Mildred Mitchell - 3 plants, 6.5 inch flowers, 26 inches tall, early midseason, evergreen, quite a bit of variability in blooms (sometimes deformed) and color - but the purple blooms can be stunning some days, bloomed May 13 to Jun 4, 20 days with blooms, K.van Bourgondien

Bluegrass Memories - 2 plants, 5.5 inch flowers, 24 inches tall, early midseason, semi-evergreen, planted Sep 18, bloomed Dec 11 to Dec 18, 4 days with blooms, Schreiner's

Spacecoast Behavior Pattern - 3 plants, 6 inch flowers, 26 inches tall, early, evergreen, bloomed May 26 to May 28 , 2 days of blooms, only 1 plant bloomed, K.van Bourgondien

Gayle Palmer - 2 plants, 5.5 inch flowers, 27 inches tall, midseason, semi-evergreen, first year, planted Mar 6, bloomed May 11 to May 19, 5 days with blooms, Gilbert Wild

Always Afternoon - 7 plants, 5.5 inch flowers, 22 inches tall, early, semi-evergreen, bloomed May 6 to May 30, rebloomed, 27 days with blooms, Spring Hill

Spiny Sea Urchin - 6 plants, 5.5 inch flowers, 27 inches tall, early midseason, semi-evergreen, not sure why some K.van plants are all yellow, bloomed May 2 to Aug 22, rebloomed, 29 days with bloom, K.van Bourgondien

Dare to Love - 3 plants, 5.75 inch flowers, 28 inches tall, flowers pretty much identical with little variation, early midseason, semi-evergreen, bloomed May 3 to May 19, 11 days with blooms, K.van Bourgondien 

Daring Deception - 3 plants, 5 inch flowers, 24 inches tall, early midseason, semi-evergreen, only 1 plant has bloomed so far, bloomed - May 3 to Jun 29 28, 19 days with blooms, rebloomed Jun 29 to Jul 6, Spring Hill

Outrageous Lavender - 2 plants, 5 inch flowers, 28 inches tall, midseason, dormant, first year, planted Apr 30, bloomed Jun 26 to Jul 21, 20 days with blooms, Olallie

​Apparition - 2 plants, 6 inch flowers, 22 inches tall, midseason, semi-evergreen, first year, planted Apr 30, bloomed Jul 6 to Jul 16, 4 days with blooms, Olallie