Oregon Sunshine, Woolly Sunflower, Common Eriophyllum: Eriophyllum lanatum var. integrifolium - Plants average 10-25 cm high. Flower heads smaller, the involucre measuring 6-10 mm wide. About 8 rays encircle the disk flowers, each ray measuring from 5-12 mm long. The leaves are typically entire or tri-lobed at the tip and the margins are generally flat, although they could occassionally be rolled under.
Woolly Sunflower, Common Eriophyllum, Eastern Woolly Sunflower: Eriophyllum lanatum var. lanatum - Leaf margins generally rolled under. Upper leaf surfaces tufted-woolly to glabrate. Lower leaf surface woolly. Leaves once pinnate, generally in the distal half of the blade with 5-7 lobes. Lower stem leaves generally alternate. This variety intergrades with var. leucophyllum near the Cascade Mountains.
Western Woolly Sunflower, Woolly Sunflower, Common Eriophyllum: Eriophyllum lanatum var. leucophyllum (Synonym: Eriophyllum lanatum var. lanatum) - Plants average 26-60 cm high. Flower heads are larger, the involucre measuring 9-12 mm wide. About 8-15 rays encircle the disk flowers, each ray measuring from 10-20 mm long. The lower stem leaves are generally opposite and once to twice pinnately lobed with margins usually strongly revolute (rolled under). Upper leaf surface glabrate whild the lower surface is densely gray-woolly.