Ramentaceous, beset with thin chaffy scales (Ramenta), as the stalks of many Ferns.
Ramification, branching, [27].
Ramulose, full of branchlets (ramuli).
Raphe, see [rhaphe].
Ray, parts diverging from a centre, the marginal flowers of a head (as of Coreopsis, [94]), or cluster, as of Hydrangea ([78]), when different from the rest, especially when ligulate and diverging (like rays or sunbeams); also the branches of an umbel, [74].
Ray-flowers, [94].
Receptacle, the axis or support of a flower, [81], [112]; also the common axis or support of a head of flowers, [73].
Reclined, turned or curved downwards; nearly recumbent.
Rectinerved, with straight nerves or veins.
Recurved, curved outwards or backwards.