Derxia gummosa
Derxia gummosa is a Gram-negative , rod-shaped , nitrogen-fixing , obligate aerobe bacterium of the genus "Derxia" . 
<triplet> Derxia gummosa <subj> Derxia <obj> parent taxon <triplet> Gram-negative <subj> bacterium <obj> subclass of <triplet> rod-shaped <subj> bacterium <obj> subclass of <triplet> Derxia <subj> Derxia gummosa <obj> taxonomic type <subj> Gram-negative <obj> Gram staining