Raceme

Simple elongated inflorescence with stalked flowers

Reniform

Kidney-shaped

Reticulate

Like a network (as in veins)

Rhizome

A prostrate thickened stem emitting roots and capable of producing leafy shoots and flowering stems from lateral and terminal buds

Rib

Prominent vein in leaf

Rogue

A plant differing from, wrongly placed, or appearing in, a batch of otherwise uniform plants

Root bound

Having roots restricted, due to confined conditions, and unable to extend, resulting in a root mass

Rootstock

The rooted portion of a plant or a root upon which one or more scions are to be or have been worked

Rugose

Wrinkled or rough

Runner

Trailing shoot taking root at the nodes

Runner

A young elongated prostrate herbaceous stem producing new plant at nodes