OREGANUM ssp. TENUE R. T. Clausen, 1975
Distribution : South-western Canada, north-western USA (British Columbia to Oregon : Cascade Mts.) ; 300 - 1550 m.
Differs from ssp. oreganum :
Stems more slender.
Leaves thinner.
"Subsp. tenue, in addition to being smaller tends to be much darker in colour (almost like brambles in late summer)" - Ray Stephenson.