First Leaves vs. True Leaves. The first two leaves that many vegetable seedling put forth areed cotyledons seed leaves , which do not pattern themselves after the leaves of the mature plant. They mainly serve as "snack packs"energy bars for the infant plant to consume so that it can put forth its own true leaves .P.os of Seedlings in alphabetical order of their Latin name The Weed Identification Chart in the Botany section includes pictures of weed seedlings and .When out in the field, gently pull a seedling up, and look for the set of leaves lowest on the stem. Beware that if the seedling is mature, with numerous sets of leaves, the cotyledon leaves may have dried up and fallen off..Need help identifying your wildflowers as they grow? their Grow Wild seeds as they burst into life so you can also keep tabs on your seedlings as they grow..