| http://www.w3.org/ns/prov#value | - They can be categorized into three plant families: lettuces, which include salad greens such as romaine and green leaf, as well as escarole, dandelion and endive; the mustard family, which is much hardier than lettuce and includes kale, collards, cabbage and of course, mustard greens; and finally there???s the beet family, which falls somewhere in between lettuce and mustard with chard, spinach an
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