Lesser Yellow Lady’s Slipper (Cypripedium parviflorum var. parviflorum)

Orchidaceae (Orchid Family) Base Flower Color: YellowReproductive Phenology: May, Jun, Jul For more information about this plant, Click Here and Here.

Greenbrier (Smilax bona-nox L. var. bona-nox)

Smilacaceae (Catbrier Family) Synonym(s): Sawbriar, Saw Greenbriar, Catbriar, Bullbriar, Stretchberry Vine Base Flower Color: Green, YellowReproductive Phenology: Apr, MayBloom Notes: My fellow hikers can attest to just how horrible a plant this is. I will carry scars for life! For more information about this plant, Click Here.

Hunger’s Carrion Flower (Smilax hugeri (Small) J. B. Norton ex Pennell)

Smilacaceae (Catbrier Family) Base Flower Color: Green, Yellow Reproductive Phenology: Mar, AprBloom Notes: Flowers Mar-May. For more information about this plant, Click Here.

Whorled Loosestrife (Lysimachia quadrifolia L.)

Primulaceae (Pimrose Family) Synonym(s): Whorled Yellow Loosestrife, Whorled Loosestrife, Prairie Loosestrife Base Flower Color: YellowReproductive Phenology: May, Jun, Jul, Aug, Sept, Oct For more information about this plant, Click Here.

Lance-leaved Loosestrife (Lysimachia lanceolata Walter)

Primulaceae (Pimrose Family) Synonym(s): Lanceleaf Loosestrife, Lance-leaved Loosestrife Base Flower Color: YellowReproductive Phenology: Jun, Jul, Aug, Sept For more information about this plant, Click Here.

Swamp Candles (Lysimachia terrestris (L.) Britton, Sterns & Poggenb.)

Primulaceae (Pimrose Family) Synonym(s): Earth Loosestrife, Swamp Candles Base Flower Color: YellowReproductive Phenology: May, Jun, Jul, Aug, Sept, Oct For more information about this plant, Click Here.

Celandine Poppy (Stylophorum diphyllum (Michx.) Nutt.)

Papaveraceae (Poppy Family) Synonym(s): Celandine Poppy, Yellow Wood Poppy Base Flower Color: YellowReproductive Phenology: Mar, Apr, MayBloom Notes: Usually yellow but can be more of an orange. For more information about this plant, Click Here.

Illinois Wood Sorrel (Oxalis illinoensis Schwegman)

Oxalidaceae (Wood Sorrel Family) Synonym(s): Illinois Wood-sorrel, Illinois Woodsorrel Base Flower Color: YellowReproductive Phenology: Mar, Apr, MayBloom Notes: Yellow with prominent red lines proximally. For more information about this plant, Click Here.

Squaw Root (Conopholis americana (L.) Wallr.)

Orobanchaceae (Broom-Rape Family) Synonym(s): American Cancer-root, Squawroot Base Flower Color: Yellow, WhiteReproductive Phenology: Mar, Apr, May, Jun, Jul For more information about this plant, Click Here.