Species within a genus

arma, = what is fitted to the body for its protection, defensive armour;
-atus, = indicates possession or likeness.
(equipped, armed)
(ld, BL)

barba, = of plants, the wool; the beard, of men;
-atus, = indicates possession or likeness.
barbatus, = having a beard, bearded; of plants, wooly, downy.
(bearded, provided with tufts of long, weak hairs)
(ld, BL)

herba, = springing vegetation, grass, green stalks or blades, green crops, an herb;
-aceous, = indicates resemblance.
herbaceous, = grass coloured, grass-green.
(ld, BL)

rigeo, rigens, = to be stiff, stiffen;
(stiff, rigid, unbendable)
-idus, = indicates a state or an action in progress.
rigidus, = stiff, hard, inflexible, rigid.
(ld, BL)