]> Botany [author note: Paeonia mascula subsp. russoi (Biv.) Cullen & Heywood] Cullen, James & Heywood, Vernon Hilton Cullen, James & Heywood, Vernon Hilton J. Cullen & V. H. Heywood Cullen & Heywood Cullen, J. & Heywood, V. H. James Cullen & Vernon Hilton Heywood