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I always get very excited when I see those little monocots and dicots poking out of the soil.

Lin says it might be because the typical monocot leaf, like a blade of grass, is narrow with parallel veins, which may be less suitable for evolving into complex traps.

The nonmonocots most closely related to that base indicate the first monocots were aquatic plants, Givnish’s team reported last month in the American Journal of Botany.

These species were selected in order to provide a phylogenetic representation traversing green algae, basal plants, monocots, and dicots.

And monocots – plants like grasses and lilies with parallel veined leaves -- had ancestors that may have also been aqueous.