Rhubarb is a stalk of many colors, ranging from dark red to pink to bright green. Red rhubarb is most common, but you’ll also see green rhubarb (don’t suspect it’s unripe).
Here’s an interesting bit of rhubarb trivia, courtesy of Karl S: strawberry rhubarb pie wasn’t originally a combination of rhubarb and berries. Rather, it referred to strawberry rhubarb, a bright red variety! Other worthy pie pairings are rhubarb-apple and rhubarb-blackberry-apple.
See information on rhubarb varieties at: http://www.rhubarbinfo.com/rhubarb-varieties.html
Even more esoteric trivia: actors, to generate crowd noise backstage, murmur the word “rhubarb” over and over. Or at least that’s what we’ve heard…