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Roots: U

ulm-

referring to the genus Ulmus, the elm (ulmifolia = elm-shpaed leaves) (ulmoides = elm-like)

umbel-

referring to umbels (umbellifera = bearing umbels) - an umbel is a flower cluster generally in the form of an umbrella, i.e., the flowers radiate from a central point

umbrac-

referring to an umbrella (shade) (umbraculifera = umbrella-bearing)

unc-

referring to a hook or spine (uncinatus / biuncifera = bearing two-pronged spines)

und-

referring to a wave (undulatus)

ung-

referring to a claw (unguis-cati = cat-clawed) (unguiculatus)

uni-

referring to the number one (uniflora = single-flowered)

urceolat-

referring to an urn (shape) (urceolatus)

uren-

burning, stinging (urens)

-ur(...)

referring to a tail (Leonurus = lion's tail)

urs-

referring to a bear (ursina)

usn-

referring to the genus Usnea, a lichen (usneoides, - the specific name of Tillandsia usneoides, the Spanish Moss)

util-

useful (utilis)

utric-

inflated (utriculata)

uva- / uvi-

referring to a grape (uvifera = grape-bearing / uva- vulpis = fox + grape)