I mean greener, darker forms of lettuce: Arugula, Baby Green Oak, Baby Green Romaine, Baby Red Oak, Red Baby Romaine, Baby Spinach, Fris?e, Green Chard, Green Tango, Lola Rosa, Mizuna, Red Leaf, Tat-Soi, Curly Endive, Green Leaf, Radicchio, Red Tango, Mache are all the variations listed.