Some persons think that the black-seeded variety is more.    From Wordnik.com.  [Resources of the Southern Fields and Forests, Medical, Economical, and Agricultural. Being also a Medical Botany of the Confederate States; with Practical Information on the Useful Properties of the Trees, Plants, and Shrubs] Reference

I just harvested a tidy little batch of black-seeded Simpson leaf lettuce.    From Wordnik.com.  [such small hands] Reference

Plant Big Boy tomatoes, Kennebec potatoes, Bolero carrots and black-seeded Simpson lettuce.    From Wordnik.com.  [RutlandHerald.com] Reference

North, had taken his fill of sweet, black-seeded, carnation-tinted pulp at some plantation in the harried South.    From Wordnik.com.  [The Rich Little Poor Boy] Reference

I grew "black-seeded Simpson" lettuce from a 19-cent package that rivaled anything I bought mail-order for five times the price.    From Wordnik.com.  [HeraldTimesOnline.com] Reference

These are the short-stapled, upland variety most commonly grown in all the Southern states, and the beautiful, long-stapled, black-seeded sea-island type that grows upon the islands and a portion of the mainland of Georgia, South Carolina, and Florida.    From Wordnik.com.  [Agriculture for Beginners Revised Edition] Reference