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rotata	wheel-like
rotatus	wheel-like
rotunda	round
rotundata	rounded
rotundus	round
rubens	red
ruber	red
rubiginosa	rusty
rubra	red
rufa	reddish brown
rufus	reddish brown
rupestre	found near rocks
rupestris	found near rocks
saccharata	sugar, sweet
saccharum	sugar, sweet