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Roots: R

racem-

referring to a raceme (racemosa)

radic-

referring to a root (Radicula = little root) (radicans usually means that the plant tends to root from its stem)

radio- / radia-

rayed, radiate (radiatus)

ramos-

referring to branches (ramosus / ramosissima = very- branched)

ran-

referring to a frog (Ranunculus = little frog, because most of the species grow where frogs live, i.e., marshes, ponds)

raph- / rhap- / rhaph-

referring to a needle (Rhapidophyllum, a palm genus, = needle-leaf)

reclin-

reclined, bent backwards (reclinatum)

recurv-

recurved (recurvatus)

rediviv-

restored, revived (rediviva)

refulg-

bright (refulgens)

regal-

regal (regalis)

regin-

referring to a queen (regina)

regl-

referring to a standard or model (paradigm) (regla)

reni-

referring to a kidney (reniform)

rep-

creeping (repens reptans repanda)

resect-

cut off, curtailed (resectus)

reticul-

reticulated, referring to a net, net-veined (reticulata)

retor-

twisted back (retortus)

retro-

backwards (retroflexus = bent backwards)

retus-

notched (retusus)

rex / reg-

referring to a king, royal (regalis)

rhamn-

referring to the genus Rhamnus, the buckthorn

rhiz-

referring to a root (Acanthorrhiza = thorny root)

rhod-

referring to the color red/rose (Rhododendron = rose + tree) (rhodantha = red-flowered)

rhomb-

rhomboid, (rhomboideus / rhombifolia = rhomboid-shaped leaves)

rhop-

referring to a club (shape) (Rhopalostyle = club-shaped flower style)

rhync-

referring to a nose or snout (Rhynchanthus = snout- shaped flower)

rhyt-

referring to a fold, a wrinkle (Rhytiglossa = wrinkled tongue / rhytidophyllum = wrinkled leaf)

ricin-

referring to the genus Ricinus, the castor-oil tree (ricinifolia)

ringens

referring to a hole

ripa-

referring to the banks of a river (riparia)

rivu- / riva-

referring to rivers, streams (rivularis / rivale / rivalis)

robust-

robust (robusta)

-rops

referring to a bush (Chamaerops = dwarf bush)

rose-

referring to the color rose (what else?!?) (rosea)

rostr-

referring to a beak (shape) (rostratus)

rotund-

round (rotundifolia = round-leafed)

rube-

referring to the color red (rubella)

rubig-

referring to rust (color) (rubiginosa)

rub- / rubr-

referring to the color red (rubens / rubra)

ruf-

referring to the color red (rufescens / rufida)

rug-

wrinkled (rugosa)

-rump(...)

referring to a rupture, a break (erumpens = breaking out of)

rup-

referring to rocks (rupicola = cliff-dwelling) (rupestris)

rut-

referring to the color red (rutilans)