Antibiotics don't come from a single plant. While many antibiotics were originally derived from microorganisms, like bacteria and fungi, some are now synthetically manufactured.

Here are some examples:

* Penicillin: Derived from the Penicillium mold.

* Streptomycin: Derived from the Streptomyces bacteria.

* Tetracycline: Derived from the Streptomyces bacteria.

* Erythromycin: Derived from the Saccharopolyspora erythraea bacteria.

While some plants have antimicrobial properties, they are not the primary source of antibiotics.

It's important to note that antibiotics are a complex class of drugs with many different origins. Not all antibiotics are derived from plants, and not all plants have antimicrobial properties.