Lupinus arboreus x polyphyllus (L. x regalis)
A short-lived perennial herb well-naturalised on rough ground, motorway and railway banks, and riverside shingle. Lowland.
This hybrid was first cultivated in Britain in 1937 after many years of experiments with other Lupinus species and hybrids, and is very popular as a garden plant. It was recorded from the wild by 1955 (Oxon), and appears to be increasing. Some cultivars may well contain genes of other lupin species, including L. nootkatensis, L. mutabilis and L. hartwegii. Backcrosses to L. arboreus also occur. It is unevenly recorded and sometimes erroneously recorded as L. polyphyllus.
A hybrid of garden origin, which also occurs spontaneously in Britain where the parents are established together.
PLANTATT - Attributes of British and Irish plants. (.zip 1455KB) This dataset was compiled and published in 2004, and last updated in November 2008. Download includes an Excel spreadsheet of the attributes, and a PDF explaining the background and nomenclature. Note that the PDF version is the booklet as published, whereas the Excel spreadsheet incorporates subsequent corrections. A hardcopy can be purchased from the Centre for Ecology and Hydrology.