Italicize parentheses when the type inside them is entirely italic. If the type inside is roman or a mix of italic and roman, make the parentheses roman. (Opening and closing parentheses should always be the same type style.)
italic: Pink phlox and purple obedient plant (Physostegia virginiana) contrast with yellow and white snapdragons.
roman: Don’t forget about dogwood (Cornus spp.), fragrant and staghorn sumac (Rhus aromatica and R. typhina), and fothergilla (Fothergilla gardenii and F. major).
SIM plant names style
• Common names
• Parentheses
• Scientific names
• Trademarked plants
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