Really awful photoshopping, but it was meant for laughs.
This House M.D. photo contains
spurge, buttercup, butterflower, butter flower, crowfoot, goldcup, kingcup, winter jasmine, and jasminum nudiflorum.
There might also be
great st john's wort, hypericum ascyron, hypericum pyramidatum, daffodil, narcissus pseudonarcissus, bur marigold, burr marigold, beggar ticks, beggar's ticks, and sticktight.