1. North American nightshade with prickly foliage and racemose yellow flowers
   - buffalo bur

Type of: nightshade

• unwounded
• unwoven
• unwrap
• unwrapped
• unwrinkled
• unwritten
• unwritten law
• unyielding
• unyieldingness
• unyoke
• unzip
• up
• up and down
• up for
• up for grabs
• up here
• up in arms
• up in the air
• up quark
• up the creek
• up the stairs
• up to
• up to her neck
• up to his neck
• up to my neck