Rhizobium leguminosarum

**Definition:** A species of gram-negative, aerobic bacteria that is found in soil and which causes formation of root nodules on some, but not all, types of field pea, lentil, kidney bean, and clover.

**Tree numbers:** - B03.440.400.425.700.800.450 - B03.585.900.450 - B03.660.050.662.670.450