I haven't been recording all the errors I've seen in the dictionary (more than I would have liked to see), but this entry has every species name it lists misspelled.
https://garden.org/nga/diction...
barrel cactus n. A common name for 3 different cacti: Echinocactus Garusonii, Ferocactus ancanthoides, and F. wislizenii.
The correct spellings and capitalization are
E. grusonii, F. cylindraceus (new species name, and acanthodes was misspelled anyway), F. wislizeni (single i at end)
As a grower of said barrel cacti, I would the name describes all Ferocactus species, a few Echinocactus species, and other spiny cacti with similar proportions.