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Roots: X

xanth-

referring to the color yellow (xanthocarpus = yellow-fruited / xanthinus)

xer-

dry (xerocarpa = dry-fruited) (Xeranthemum = dry flower)

xiph-

referring to a sword (xiphioides)

xyl-

referring to wood (Xylobium = wood + life, referring to the epiphytic habit of these orchids)