Pedigree Chart of
Tweeny
, 12 W-Y, Alec Gray, England, 1950
Renown
Mortlake
Unknown
G.L. Wilson
2Y-Y seedling
Ben Alder
1Y-Y
Broadford
Elgin
(Weardale Perfection x unknown)
Yukon
Tweeny
N. rupicola subsp. watieri