GENUS Sisymbrium L. (ROCKETS) IN THE FLORA OF LATVIA

Communicated by Viesturs MelecisOne of the largest genera in the Cruciferae family in Latvia is Sisymbrium L. The genus includesnot only native, but also some alien species. The distributions of the Sisymbrium species were reviewedfor the first time in the last 50^th years in Latvia. The distribution data were compiled fromherbarium material, literature and field surveys. An identification key for the Sisymbrium speciesin Latvia and detailed scientific nomenclature are presented in the current study. In total, sevenspecies of Sisymbrium were found in Latvia — S. supinum L., S. loeselii L., S. polymorphum(Murray) Roth, S. volgense M. Bieb. ex E. Fourn., S. altissimum L., S. orientale L. and S.officinale (L.) Scop. The mainly were recorded in railway verges, roadsides, waste dumps andwasteland. Five species of the genus are alien to the flora of Latvia — S. loeselii, S. altissimum,S. polymorphum, S. orientale, and S. volgense; two are native — S. supinum and S. officinale.