U is for Unless. I was trying to find a good botanical U word, but I could locate very few. Umbel is "an inflorescence with pedicles or branches arising at the same point and of nearly equal length." Think Queen Anne's Lace. Ulmus is the whole family of elms, and Urtica is the stinging nettle. Stinging nettle made me think of the problems we can face when gardening. And that made me think of an alphabet book by…