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I. Order Asparagales
Iridaceae - iris family
Iris virginica (= I. shrevei) (blue flag, iris)
Iris versicolor (blue flag)
Iris lacustris (dwarf lake iris) [threatened]
Iris pseudacorus (yellow flag)
Sisyrinchium albidum (blue-eyed grass)
Crocus vernuus (spring crocus) - cultivated
Hypoxidaceae - star-grass family [Liliaceae in G&C, Amaryllidaceae in Spring Flora]
Hypoxis hirsuta (star-grass)
Orchidaceae - orchid family
Cypripedium calceolus (yellow lady's-slipper)
Cypripedium candidum (white lady's-slipper) [threatened]
Cypripedium reginae (showy lady's-slipper)
Cypripedium acaule (moccasin flower, stemless lady's-slipper)
Cypripedium arietinum (ram's head lady's-slipper) [threatened]
Aplectrum hyemale (putty root, Adam-and-Eve)
Calopogon tuberosus (grass pink)
Corallorhiza trifida (early coral root)
Goodyera pubescens (rattlesnake plantain)
Platanthera ciliaris (orange fringed orchid) [= Habenaria]
Platanthera leucophaea (prairie white fringed orchid) [= Habenaria]
Platanthera psycodes (purple fringed orchid) [= Habenaria]
Malaxis monophylla (white adder's mouth)
Orchis spectablis (showy orchis)
Pogonia ophioglossoides (snake mouth orchid)
Spiranthes cernua (nodding ladies' tresses)
II. Order Dioscoreales
Dioscoreaceae - yam family
Dioscorea villosa (wild yam)
III. Order Commelinales
Commelinaceae - spider wort family
Tradescantia ohiensis (common spiderwort)
Commelina communis (common day flower)
Ponteridaceae - pickeral weed family
Pontenderia cordata (pickeral weed)
Zosterella dubia (water star-grass)