Is a tautonym (genus and species name being exactly identical) valid in the scientific name of any plant?

Correct answer: No, it is not permitted in plants

Correct answer: A. Under the rules of botanical nomenclature, a tautonym is a name in which the genus and the specific epithet are identical, such as a hypothetical Genus genus. Such repetition is not permitted for plant names. Option A is correct because botanical nomenclature requires the specific epithet to be distinct from the genus name. Option B is incorrect because plants do not generally allow tautonyms. Option C is incorrect because the rule does not depend on plant size, growth form, or whether the organism is a tree. Option D is incorrect because a botanist cannot freely ignore the international rules. Zoological nomenclature differs in this respect: tautonyms can occur in animal names, which is a common source of confusion. Also, the modern botanical code is called the International Code of Nomenclature for algae, fungi, and plants; the older term ICBN may appear in textbooks.