Cercis siliquastrum, commonly known as the Judas tree or Judas-tree, is a small deciduous tree from Southern Europe and Western Asia which is noted for its prolific display of deep pink flowers in spring.
This species forms a small tree up to 12 metres in height and 10 metres in width.
The deep pink flowers are produced on year-old or older growth, including the trunk in late spring (cauliflory). Also, the flowers display a blossom with five free petals and fused sepals. This shape is specific to the Fabaceae. The leaves appear shortly after the first flowers emerge. These are cordate with a blunt apex, which occasionally has a shallow notch at the tip. The tree produces long flat pods that hang vertically. The flowers are edible and purportedly have a sweet-acid taste.
The species was first described by Linnaeus in 1753 and he gave it the specific epithet of siliquastrum which is derived from the Latin word siliqua, meaning "pod". The generic name comes from the Greek kerkis, a "shuttle", which refers to the resemblance shown to this weaver's tool by the flat, woody seedpods.
There are several varieties and subspecies and these include:
- var. hebecarpa Bornm.
- nothosubsp. yaltikirii (Ponert) Govaerts
- var. siliquastrum
- var. alba Weston
Distribution and ecological aspects
In Israel the tree has a status of a protected plant.
- 'Afghan Deep Purple'
- 'Alba' - white flowers
- 'Fructa Rubra'
- 'Rubra' - dark pink-purple flowers
- 'White Swan'
Propagation is by seed, cuttings or budding.
The species produces hard wood with an attractive grain. It is used in veneers and polishes well.
There is a long-standing myth that Judas Iscariot hanged himself from a tree of this species. This belief is related to the common name "Judas tree", which is possibly a corrupted derivation from the French common name, Arbre de Judée, meaning tree of Judea, referring to the hilly regions of that country where the tree used to be common. Another possible source for the vernacular name is the fact that the flowers and seedpods can dangle direct from the trunk in a way reminiscent of Judas' suicide.
A sermon illustration on the deadly effects of succumbing to temptation refers to an idea that the Judas Tree killed bees drawn to it: "Dr. Cuyler forcibly illustrates this by reference to the Judas tree. The blossoms appear before the leaves, and they are of a brilliant crimson. The flaming beauty of the flowers attracts innumerable insects; and the wandering bee is drawn after it to gather honey. But every bee which alights upon the blossom, imbibes a fatal opiate, and drops dead from among the crimson flowers to the earth." 
- "The Judas Tree" (Jonathan Creek)
- Chapter 7 of V. by Thomas Pynchon
- Flowering Judas by Katherine Anne Porter
- Fictionally used to poison The Doctor in the 2011 episode of Doctor Who, "Let's Kill Hitler"
- In the fourth episode of the fifth season of the HBO television series True Blood, the leader of the vampires, Roman, uses a stake made of Cercis siliquastrum to stake another vampire.
- The surname of Hinagiku Katsura (Hayate the Combat Butler), who has pink hair, means Judas Tree in Japanese.
- "BSBI List 2007". Botanical Society of Britain and Ireland. Archived from the original (xls) on 2015-02-25. Retrieved 2014-10-17.
- "Cercis siliquastrum- L.". Plants For A Future. Retrieved 13 September 2011.
- Rowell, Raymond J. (1980). Ornamental Flowering Trees in Australia. Australia: AH & AW Reed Pty Ltd Reed. ISBN 0-589-50178-X.
- Rumsey, Fred. "Cercis siliquastrum (Judas tree)". Natural History Museum. Retrieved 2013-01-04.
- Hickey, Michael; Clive King. 100 families of flowering plants. Cambridge University Press. Retrieved 13 September 2011.
- Hatch, Laurence (2007). Cultivars of Woody Plants Volume I (A-G). Raleigh, North Carolina: TCR Press. Retrieved 13 September 2011.
- Mabberley, D.J. (2008). Mabberleys's plant-book (3 ed.). Cambridge University Press. p. 170. ISBN 978-0-521-82071-4.
- William Adamson, “Illustrations to Chapter 3,” in Genesis, The Preacher’s Complete Homiletic Commentary (New York; London; Toronto: Funk & Wagnalls Company, 1892), 72.
- International Legume Database & Information Service (ILDIS): Cercis siliquastrum
- The Royal Horticultural Society : Circus siliquastrum
- Wildflowers of Israel : Judas tree
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