Scientific name: Sorbus x proctoriana
Status: IUCN – Critically Endangered.
Flowering time: May. Fruiting: August – September.
Description: Small tree growing up to at least 8 metres tall with leaves divided like rowan tree leaves, with 9 or 10 pairs of leaflets. White flowers in densely-crowded clusters and small red/orange berries. Only 1 tree known to exist!
Social history: Discovered in 2005 and named after Michael C. F. Proctor.
Taxonomy: Hybridisation between Sorbus aucuparia (rowan tree) and Sorbus scalaris (an ornamental Chinese rowan thought to have come from a nearby garden).
Global and national distribution: Endemic to North Somerset.
Threats: Limited population.
Photographs: © Denice Stout, © Libby Houston.