Leaf arrangement: opposite

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Photo of closed gentian flowers

Closed Gentian (Bottle Gentian)

Gentiana andrewsii

Photo of common milkweed flower cluster

Common Milkweed

Asclepias syriaca

Photo of dead nettle stalk with flowers

Dead Nettle

Lamium purpureum

Photo of dittany flowers

Dittany

Cunila origanoides

Edible

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 Ohio horsemint inflorescence

Ohio Horsemint

Blephilia ciliata

Edible

Photo of prairie milkweed plant in flower.

Prairie Milkweed (Tall Green Milkweed)

Asclepias hirtella

Photo of purple milkweed flower cluster

Purple Milkweed

Asclepias purpurascens

Photo of rose verbena, or rose vervain, flower cluster showing leaves

Rose Verbena (Rose Vervain)

Glandularia canadensis (formerly Verbena canadensis)

Photo of self-heal flower head

Self-Heal (Heal-All)

Prunella vulgaris

Edible

Photo of slender mountain mint flowers

Slender Mountain Mint

Pycnanthemum tenuifolium

Edible

Photo of cut-leaved teasel showing flowerhead and joined, cuplike leaves.

Teasels

Dipsacus fullonum and D. laciniatus

Invasive

Photo of wild bergamot or horsemint plant with lavender flowers

Wild Bergamot

Monarda fistulosa

Edible

Photo of wild four-o'clock flower

Wild Four-O’Clock

Mirabilis nyctaginea

Poisonous