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932 gentians, dogbanes, madders, and allies species
Sherardia arvensis
Galium concinnum
Gentiana prostrata
Asclepias fascicularis
Gentianopsis thermalis
Galium album
Galium lanceolatum
Frasera caroliniensis
Frasera albicaulis
Asclepias quadrifolia
Gentiana platypetala
Lomatogonium rotatum
Gentiana rubricaulis
Swertia perennis
Bartonia virginica
Asclepias hirtella
Galium labradoricum
Houstonia canadensis
Sabatia kennedyana
Galium pilosum
Asclepias lanuginosa
Galium tinctorium
Frasera fastigiata
Gentiana algida
Sabatia angularis
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