Hummadruz brings together Hilary Llewellyn-Williams's first two collections, the long-absent The Tree Calendar (1987) and Book of Shadows (1990).

The former includes her reputation-making title sequence of poems reflecting on the Celtic calendar, in which each month is represented by a tree.

Book of Shadows includes a group of poems inspired by Giordano Bruno, Renaissance philosopher, monk, magician and poet, who was burned at the stake for heresy.

These two sequences lie at the heart of Llewellyn-Williams's poetry, standing as it does at the interface of nature, mythology, contemporary science and mysticism.

Hilary Llewellyn-Williams was born in Kent but made her home in west Wales for a number of years, before moving recently to Pontypool. Widely published, she has read her work in a variety of venues and taught in schools, workshops and seminars. She has also travelled in Europe and North America. Her collections for Seren are The Tree Calendar, Book of Shadows and Animaculture.