The Lilac reference article from the English Wikipedia on 24-Apr-2004
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Lilac

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The Lilacs are a group of shrubs, of the genus Syringa, in the family Oleaceae. They range in size from small shrubs to small trees. They are often grown for the panicles of white, pale pink or more generally purple flowers. The flowers grow in large clusters, and have a strong and fragrant scent.

A pale purple colour is generally known as 'lilac' after the flower.

image:lilac.head.250pix.jpg
Detail of a single flower head
Larger version

Purple lilac: Syringa vulgaris
Purple lilac: Syringa vulgaris

Lilac cultivar thumbnail
Larger lilac cultivar image

Image:Syringa.jpg
Cordate leaves of Syringa vulgaris