The plant you are referring to as "poisonous plant Amaryllis" is likely not actually Amaryllis.

Here's why:

* "Amaryllis" is a common name, not a scientific one. The true Amaryllis species only has one member, Amaryllis belladonna, also called the Belladonna Lily.

* Many other plants are called "amaryllis" in everyday language, but are actually members of the Amaryllidaceae family, which includes many poisonous plants.

Therefore, to identify the specific poisonous plant you're asking about, you need to provide more information:

* What does the plant look like? (Color, leaf shape, flower shape, etc.)

* Where did you find it? (Location, habitat)

* What other names are associated with it? (Common names, nicknames)

Once you provide more details, I can help you identify the plant and its scientific name.