Ramification. Branching.
Ray. The branch of an umbel; the marginal flowers of an inflorescence when distinct from the disk.
Receptacle. The more or less expanded or produced portion of an axis which bears the organs of a flower (the torus) or the collected flowers of a head; any similar structure in Cryptogams.
Recurved. Curved downward or backward.
Reflexed. Abruptly bent or turned downward.
Regular. Uniform in shape or structure.
Reniform. Kidney-shaped.
Repand. With a slightly uneven and somewhat sinuate margin.
Resiniferous. Producing resin.
Reticulate. In the form of network; net-veined.