Reticulated, the veins forming network, [50]. Retiform, in network.
Retinerved, reticulate-veined.
Retroflexed, bent backwards; same as reflexed.
Retuse, blunted; the apex not only obtuse but somewhat indented, [54].
Revolute, rolled backwards, as the margins of many leaves, [72].
Rhachis (the backbone), the axis of a spike or other body, [73].
Rhaphe, the continuation of the seed-stalk along the side of an anatropous ovule or seed, [112], [126].
Rhaphides, crystals, especially needle-shaped ones, in the tissues of plants, [137].
Rhizanthous, flowering from the root.