Final answer:
Carl Linnaeus is the person who published the species 'Acalypha australis L.', signified by the 'L.' after the species name in binomial nomenclature.
Step-by-step explanation:
The species Acalypha australis L. was published by Carl Linnaeus. He is the person indicated by the 'L.' after the species name, which signifies Linnaeus as the authority who formally described the species. Linnaeus was a notable Swedish botanist, physician, and zoologist who laid the foundations for the modern biological naming scheme of binomial nomenclature. Hence, the publication of Acalypha australis can be attributed to his body of work. The reference 'L.' is universally recognized in the scientific community to represent Linnaeus when citing a species name. It's important to note that within the context of botany, 'published' refers to the formal description of the species in scientific literature, not the publication of articles such as those presented in the reference provided.