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April 20, 2007 : Trillium ovatum 'Tillicum'
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Keywords: Melanthiaceae | Trillium ovatum 'Tillicum' | 014924-0050-1977
In horticultural parlance, this is considered a “double-flowered form” of western trillium. As noted by Ron B in response to silver_creek's photograph of this same plant at UBC Botanical Garden in this discussion thread, double-flowered trilliums are indeed uncommon, to the point where no named cultivars were known to exist by the authors of a book on the genus. This cultivar predates that book by at least twenty years, but seems to have slipped into obscurity. With the exception of the photographs and discussion on the UBC BG web site, there are no other mentions of it online. Perhaps it has only ever been in the collections of two institutions: UBC BG and the Washington Park Arboretum, the source of the material here at UBC.
An understanding of double-flowering manifestations is continuing to build. It has long been recognized that double-flowered forms are the result of mutated floral organs, e.g., stamens developing as petals. However, the genetics of these transformations, such as which genes are at least partly responsible, has not been well understood until recent years. I'll have to track down the paper this media release is based on, but for now, please read Genes for Unusual 'Flower Within a Flower' are Identified by UCSD Scientists.
Posted by Daniel Mosquin at April 20, 2007 6:11 AM
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Posted by: John Gyer at April 20, 2007 10:08 AM
Ah, I should have mentioned double-flowered western trilliums to be a bit more specific when stating how uncommon they are re: cultivars.
For those locals interested, a double-flowered trillium, Trillium ovatum 'Plenum' will be available at next week's Collectors' Plant Auction.
Posted by: Daniel Mosquin 
at April 20, 2007 2:21 PM
Please share your comments about the photograph(s) and accompanying write-up. Telling a story about the subject of the photograph(s) is also much appreciated! If you have a gardening question, the best place to ask is on the UBC Botanical Garden Forums. Thank you!
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Double-flowered trillium have a long history. The history began with the 1864 record of a double-flowered Trillium grandiflorum taken from the wild into a garden. Since then doubles have been recorded in T.erectum, T.ovatum and some sessile trilliums. A problematic record of a double T.vasyii exists, but the plant is no longer known to be in cultivation.
In addition to doubling caused by "normal" genetic mutations, it can be associated with a diseased state - both viral and mycoplasmal.
A historical study and search for the wild origin of cultivated forms is available in: ROCK GARDEN QUARTERLY, vol. 59#3, Summer 2001 - Double Trillium: History of an Elusive Flower by John and Janet Gyer. The work was also published in THE GREEN SCENE, the magazine of the Pennsylvania Horticultural Society, November 1997. Three named forms of T.ovatum were found during this historical research 'Edith', 'Barbara Walch', and 'Kemoor'.