Woolly Head Clover: ssp. arcuatum - (former variety piperi) Found in northeastern Oregon as far south as the Strawberry Mts.
Cascade Woolly Head Clover: ssp. cascadense - Found in the north Oregon Cascades and Siskiyou Mts.
Cusick's Clover: ssp. cusickii - Found in southeastern Oregon as far north as the southern Blue Mts.
Woolly Head Clover: ssp. eriocephalum - Found in the Cascade Mts south to the Siskiyou Mts. and occasionally in the Blue Mts.
Woolly Head Clover: ssp. martinii -