The word you're looking for is "Xerophyte." While it's not directly associated with the Oregon Trail itself, xerophytes are plants adapted to survive in arid climates, which could be relevant to some of the regions encountered along the trail. The Oregon Trail traversed various ecosystems, including areas where drought-resistant plants would thrive.
Xenophonic
x
Xerox
"X Marks the Spot - Oregon Survey History #1" (GC6E77)
A word that starts with X is a xylophone.
A word that starts with S and ends with X is sphinx.
s there a word that starts with x related to byzantine empire?
x-ray
X planet.
x-am
xylophonexylophone
there is no such word