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932 gentians, dogbanes, madders, and allies species
Asclepias syriaca
Apocynum androsaemifolium
Mitchella repens
Asclepias incarnata
Vinca minor
Asclepias tuberosa
Galium boreale
Apocynum cannabinum
Cephalanthus occidentalis
Galium aparine
Galium triflorum
Asclepias speciosa
Vincetoxicum rossicum
Houstonia caerulea
Gentiana andrewsii
Asclepias verticillata
Asclepias exaltata
Galium odoratum
Vinca major
Asclepias viridiflora
Gentianella amarella
Gentiana alba
Gentiana linearis
Galium mollugo
Gentianopsis crinita
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