Green flowers

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Photo of Chinese yam showing leaves and bulbils

Chinese Yam

Dioscorea oppositifolia (sometimes called D. batatas)

Invasive

Photo of climbing false buckwheat vines, leaves, and flowers.

Climbing False Buckwheat (Crested Buckwheat)

Fallopia scandens (formerly Polygonum scandens)

Rope dodder stems

Dodders

Cuscuta spp.

Photo of several big bluestem seed heads against a blue sky.

Grasses

All true grasses (species in the grass family).

Photo of whorled milkweed flowers.

Milkweeds

Subfamily Asclepiadoideae

Photo of pokeweed plant with dangling stalks of ripe and unripe berries.

Pokeweed

Phytolacca americana

Poisonous

Photo of white snakeroot leaves and flowers

White Snakeroot

Ageratina altissima (formerly Eupatorium rugosum)

Poisonous

Photo of yellow passionflower flowers.

Yellow Passion Flower

Passiflora lutea