Reading a good article in the WaPo's Metro section yesterday on the little-known memorial for Henry Marytn Robert, I was once again stopped dead by an incorrect Plant ID. I'm not keeping track, but in my random reading experience I'd say the Metro section writers are zero for 10 this year.
I copied the accompanying photo here -- that "holly bush" is actually the common Nandina and that misidentified "elephant grass" is known locally as "monkey grass" or "Lily turf" or more correctly, Liriope. (Just for clarification, this is elephant grass.) Both Nandina and Liriope are probably the most ubiquitous landscape plants in the DC area -- certainly not anything rare or unique. Nobody is perfect, but I do expect a basic level of plant knowledge in any area resident's brain -- similar to knowing a hot dog from a half-smoke or what times the lane direction's change in Rock Creek Park. You should just know these things.