To honor Fred and Roberta, below are photographs of all but one of the species of Trillium that I saw in 2010 (I did not take a photo of Nodding Wakerobin, Trillium flexipes, which I saw in April at Bentley Woods).
Whip-poor-will Flower (Trillium cernuum), June 7, 2010, Pokegama Wetlands, Douglas County, Wisconsin
White Trillium (Trillium grandiflorum), April 18, 2010, Bentley Woods, St. Joseph County, Indiana
Ozark Wakerobin (Trillium pusillum var. ozarkanum), April 22, 2010, Shannon County, Missouri
Bloody Butcher (Trillium recurvatum forma recurvatum), April 18, 2010, Bentley Woods, St. Joseph County, Indiana
Bloody Butcher (Trillium recurvatum forma luteum), April 18, 2010, Bentley Woods, St. Joseph County, Indiana
Toadshade (Trillium sessile), April 21, 2010, Spurgeon Hollow, Shannon County, Missouri
Wood Wakerobin (Trillium viride), April 20, 2010, Victoria Glade, Jefferson County, Missouri
Tapertip Wakerobin (Trillium viridescens), April 25, 2010, Mount Magazine, Logan County, Arkansas
Tapertip Wakerobin (Trillium viridescens), unnamed purple-petaled form, April 25, 2010, Mount Magazine, Logan County, Arkansas
Trillium sp., presumably an unnamed purple petaled and sepaled form of Tapertip Wakerobin (Trillium viridescens) growing in the same colony as plants in the previous two photos, April 25, 2010, Mount Magazine, Logan County, Arkansas