|
Species |
Status and distribution |
Spontaneous hybridisation |
Gene flow |
|
_ |
_ |
BC |
F2 |
|
Brassica rapa (2n = 20)
Wild Turnip, Bargeman's Cabbage, Navew |
Probably native but widely introduced. Characteristic of river and canal banks; locally abundant on railways, roadsides, waste ground. very commonly confused with oilseed rape. |
ü |
ü |
ü |
ü |
High when small numbers of B. rapa in oil-seed rape field. Hybrids of backcrosses inter-mediate fitness. Introgression dependent on genome location, but probably rare and erratic in natural populations. |
|
Hirschfeldia incana
(= Brassica adpressa) (2n = 14)
Hoary Mustard |
Introduced weed of waste ground, docks, power stations, rubbish dumps and occasionally sand dunes. Common in southern England and Wales, scattered elsewhere; rare in Scotland. Native to Mediterranean. |
ü |
ü s |
ü |
X |
Hybrids have low fertility. Introgression unlikely because of genome incompatibility. |
|
Raphanus raphanistrum (2n = 18)
Wild Radish, Runch, White Charlock |
Probably introduced weed of cultivation; waste ground, roadsides and dockland, although ssp. maritima on coastal cliffs may be native. Common in England; frequent elsewhere. Native in Europe. |
ü |
ü s |
ü |
ü ? |
Hybrids produced in small numbers and have low fertility. Introgression difficult because of unshared genomes. |
|
Sinapis arvensis (2n - 18)
Charlock, Wild Mustard, Kilk |
Native and extremely common and formerly serious weed of fields, roadsides, railways, gardens, rubbish tips and waste ground. |
- |
ü s |
- |
m |
Introgression unlikely, but little information. |
|
Brassica juncea (2n = 36)
Chinese Mustard, Indian Mustard, Brown Mustard |
Introduced casual of fields, roadsides, paths and waste ground, especially in cities. Scattered in southern Britain, rare in west and north. Native to Asia. |
ü |
ü |
m |
m |
Low numbers (3%) of hybrids. No data on field performance or introgression. |
|
Brassica oleracea (2n = 18)
Wild Cabbage, Sea Cabbage |
Probably introduced by the Romans. Natural-ised on sea cliffs, especially chalk, limestone and basic shales. Scattered around British Isles but commoner on southern coasts. Native in Southern Europe. |
ü |
- |
- |
- |
Details unknown. Introgression possible in theory because of parental C genome. |
