There are rules for how to write out a scientific name, including varieties, subspecies, forms, and cultivars. In general, the genus & specific epithet is italicized (when typing) or underlined (when handwriting).
Pronouncing a scientific name may be just as hard to spelling it. A few tips - divide up the vowels into separate syllables (unless they are part of a name) and speak clearly with confidence. Scientific names are based on several languages and names - it is hard to know how to pronounce them "properly".
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