Distinguishing characteristics between monocots/ dicots

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(in this image I am referring to the crab grass not the ant hill) Crab grass- Digitaria sanguinalis: This is a monocot because each strand of crab grass has veins with don't branch off one another, instead they are all parallel to each other.
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Maple Leaves: Viburnum acerifollum: Maple leaves are dicots because each leaf contains veins which branch off of one another as opposed to being parallel like monocots.
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Alstroemeria ligtu: These are monocots because they have 3 flower parts.
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David Ramsey Hydrangea: Hydrangea macrophylla: These are dicots because of the multiple (more than 3) flowering parts.