pp 177 – 180 in Groendijk-Wilders N, C Alexander, R G van den Berg & H L A Hetterscheid (eds). Proceedings of the Fifth International Symposium on The Taxonomy of Cultivated Plants. Leuven, Belgium: ISHS
The RHS is the UK’s gardening charity, helping people and plants to grow - nurturing a healthier, happier world, one person and one plant at a time.
