"Coffee senna" is a common name used for several different plants, and none of them are actually Senna (the genus associated with Senna tea). Here's a breakdown of the most common plants referred to as "coffee senna":

* Cassia occidentalis: This is the most common plant called "coffee senna". It's a member of the Cassia genus, not Senna. Its scientific name is Cassia occidentalis.

* Senna obtusifolia: This plant is sometimes also called "coffee senna", but it's actually a true Senna species. Its scientific name is Senna obtusifolia.

Important Note: Both of these plants are toxic and can cause serious health problems if ingested. They are NOT the same as the Senna used for Senna tea (Senna alexandrina or Senna italica).

Here's a quick comparison table:

| Common Name | Scientific Name | Genus | Toxic? |

|---|---|---|---|

| Coffee Senna | Cassia occidentalis | Cassia | Yes |

| Coffee Senna | Senna obtusifolia | Senna | Yes |

| Senna tea | Senna alexandrina / Senna italica | Senna | No (when used correctly) |

Always double-check the scientific name of any plant you're considering using, and consult with a qualified expert before using any plant for medicinal purposes.