Leaf arrangement: opposite

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Photo of American germander flowers

American Germander

Teucrium canadense

Photo of false dragonhead plant with flowers

False Dragonhead (Obedient Plant)

Physostegia virginiana

Photo of whorled milkweed flowers.

Milkweeds

Subfamily Asclepiadoideae

Photo of northern fog fruit flowering head

Northern Fog Fruit

Lippia lanceolata (formerly Phyla lanceolata)

Photo of perennial or summer phlox flower cluster.

Perennial Phlox

Phlox paniculata

Photo of purple loosestrife flowering stalks showing purple flowers

Purple Loosestrife

Lythrum salicaria

Invasive

Photo of sand vine, leaves with flower cluster.

Sand Vine (Climbing Milkweed)

Cynanchum laeve

Photo of common gerardia plant with flowers

Slender False Foxglove

Agalinis tenuifolia (formerly Gerardia tenuifolia)

Photo of swamp milkweed, three plants with flower clusters.

Swamp Milkweed

Asclepias incarnata