Compositae source details
Memoirs of the Torrey Botanical Club 5(23):
322976
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Date
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Carduus undulatus var. megacephalus (A.Gray) Porter accepted as Cirsium undulatum var. undulatum (Nutt.) Spreng. (original description)
Lactuca spicata var. integrifolia (Torr. & A.Gray) Britton accepted as Lactuca biennis (Moench) Fernald (original description)
Lactuca spicata var. integrifolia (Torr. & A.Gray) Britton accepted as Lactuca biennis (Moench) Fernald (original description)
