@book {563, title = {Zygophyllaceae}, year = {1931}, publisher = {2nd edition, vol. 19a, section 2:}, organization = {2nd edition, vol. 19a, section 2:}, address = {Leipzig, Engelmann.}, author = {Engler, A.} } @article {546, title = {Zygophyllaceae}, journal = {In: Engler A, Prantl K, eds. Die nat{\"u}rliche PflanzenfamilienIn: Engler A, Prantl K, eds. Die nat{\"u}rliche Pflanzenfamilien}, volume = {2nd edition, vol. 19a, section 2:}, number = {Leipzig, Engelmann.}, year = {1931}, pages = {144-184. }, author = {Engler, A.} }