The “amaryllis” you typically see for sale around the holidays are actually in the genus Hippeastrum, and not the true genus Amaryllis. The two are closely related genuses, but it still took a few hundred years to figure it out.
These images are from The Botanist’s Repository, v.3-4 (1797), which classified both as being in the genus Amaryllis. However, neither of these are now considered to be in the genus Amaryllis. The first one is the aforementioned Hippeastrum (H. reticulatum), while the second is actually Nerine sarniensis, a native of South Africa that is widely cultivated in gardens around the world. That’s what’s so great about sites like the Encyclopedia of Life—you can enter a history species name and see what its current scientific name is.
Beautiful, regardless—as is the Botanist’s Repository, a publication from Henry Charles Andrews, English botanist, artist, and engraver. Find it in the @biodivlibrary.