When I dug out the seed packet, I discovered it was Diplotaxis tenuifola, also known as wild arugula or Selvetica, an extremely cold hardy perennial (as plants must be to survive Alaskan winters).    From Wordnik.com.  [Garden Treasure with 4 Recipes for Arugula: with Eggs, in Salads, and in Pasta Sauce (4 Συνταγές για Ρόκα)] Reference

Diplotaxis acris, Boiss.    From Wordnik.com.  [The Land of Midian — Volume 2] Reference

Diplotaxis.    From Wordnik.com.  [Vegetable Teratology An Account of the Principal Deviations from the Usual Construction of Plants] Reference

Diplotaxis muralis.    From Wordnik.com.  [Vegetable Teratology An Account of the Principal Deviations from the Usual Construction of Plants] Reference

Diplotaxis tenuifolia.    From Wordnik.com.  [Vegetable Teratology An Account of the Principal Deviations from the Usual Construction of Plants] Reference

The Salt Range genera Diplotaxis and.    From Wordnik.com.  [The Panjab, North-West Frontier Province, and Kashmir] Reference

Diplotaxis, 136, 148, 364 muralis, 252, 458 tenuifolia, 73, 250, 261, 274, 280, 397, 398, 430.    From Wordnik.com.  [Vegetable Teratology An Account of the Principal Deviations from the Usual Construction of Plants] Reference