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Uvularia Grandiflora
- plant of southern and southeastern United States grown for its yellow flowers that can be dried
Ulex Europaeus
- very spiny and dense evergreen shrub with fragrant golden-yellow flowers; common throughout western Europe
Uruguay Potato Vine
- South American potato vine
Usnea Barbata
- greenish gray pendulous lichen growing on trees
Urnula Craterium
- an urn-shaped discomycete with a nearly black interior
Ustilago Maydis
- a common smut attacking Indian corn causing grayish white swellings that rupture to expose a black spore mass
Urocystis Cepulae
- smut fungus causing blackish blisters on scales and leaves of onions; especially destructive to seedlings
Urocystis Tritici
- fungus affecting leaves and stems of wheat
Ustilaginoidea Virens
- fungus causing green smut in rice
United States Customary System
- the system of weights and measures based on the foot and pound and second and pint that dates back to colonial America but differs in some respects from the British Imperial System; today in the United States this system exists side by side with the SI sy