Rootstock, root-like trunks or portions of stems on or under ground, [42].
Roridus, dewy.
Rosaceous, arranged like the petals of a rose.
Rostellate, bearing a small beak (Rostellum).
Rostrate, bearing a beak (Rostrum) or a prolonged appendage.
Rosulate, in a rosette or cluster of spreading leaves.
Rotate, wheel-shaped, [89].
Rotund, rounded or roundish in outline.
Ruber, Latin for red in general. Rubescent, Rubicund, reddish or blushing.
Rudimentary, imperfectly developed, or in an early state of development.