Flower heads of Senecio integerrimus var. ochroleucus
Bolander's Butterweed, Bolander's Groundsel, Bolander's Ragwort, Harford's Ragwort: Packera bolanderi var. harfordii (Synonyms: Senecio bolanderi var. harfordii, Seneio harfordii) - Basal and lower stem leaves roundeded with shallow, palmate lobes.
Alpine Meadow Groundsel: Packera streptanthifolia (formerly Senecio cymbalarioides) - Flower heads generally solitary. Plants up to 10 cm high.
Sweet Marsh Groundsel: Senecio foetidus var. hydrophiloides - Stems are erect and the herbage is glabrous or at least not glaucous. Leaves and stems not fleshy. Flowers all discoid, ray flowers generally lacking.
Great Swamp Groundsel Senecio hydrophilus - Stems are erect and the herbage is glaucous. The stems and leaves are both smooth and somewhat fleshy. The leaves are mostly entire. The flower heads are yellow, with disk flowers, but ray flowers may be absent.
Western Groundsel: Senecio integerrimus var. exaltatus - An erect wildflower with a single stem. The yellow flower heads have both ray and disk flowers. Many spoon-shaped basal leaves are found at the base of the plant, with reduced stem leaves. The basal leaves tend to oblanceolate or elliptic in shape.
Western Groundsel: Senecio integerrimus var. ochroleucus - An erect wildflower with a single stem. The creamy white flower heads have both ray and disk flowers. Many spoon-shaped basal leaves are found at the base of the plant, with reduced stem leaves. The basal leaves tend to be deltoid or subcordate.
Tansy Ragwort: Senecio jacobaea - An erect wildflower with numerous yellow flower heads with both ray and disk flowers up to 100 cm high. The leaves are finely cut, similar to those of tansy.
Streambank Butterweed: Packera pseudaurea var. pseudaurea (formerly Senecio pseudaureus) - An erect wildflower to 70 cm with thin leaves. The basal leaves are long-petiolate, cordate, with serrate margins. The stem leaves are few, reduced in size, and laciniate toward the bases, with cleft margins. The flower heads are yellow, with both disk and ray flowers.
Woods Groundsel: Senecio sylvaticus - A short-haired weedy annual similar to common butterweed but with the main stem branched and from 30-90 cm high. The grayish leaves are lanceolate, deeply toothed to lobed. The rays are short and often inconspicuous.
Arrow-leaf Groundsel: Senecio triangularis - A tall wildflower of moist areas in the foothills and mountains. Numerous, soft, green arrowhead shaped leaves along the entire stem. The numerous flower heads are yellow, with both disk and ray flowers present.
Common Butterweed: Senecio vulgaris - Small, low-growing, weedy annual or winter annuals to 30 cm high. Flowers all discoid, ray flowers lacking. Involucral bracts tipped with black spots. Leaves pinnatifid.