Learn how to say Rosea correctly in English with this tutorial pronunciation video.
Oxford dictionary definition of the word hollyhock:
a tall Eurasian plant of the mallow family, with large showy flowers.
Alcea rosea, family Malvaceae
Middle English: from holy + obsolete hock ‘mallow’, of unknown origin. It originally denoted the marsh mallow which has medicinal uses (hence, perhaps, the use of ‘holy’); the current sense dates from the mid 16th century