Rudbeckia klamathensis

Perennials, 50-100 cm (rhizomatous, roots fibrous). Leaves greenish blue (± glaucous), blades ovate to elliptic, often lobed, herbaceous, bases attenuate to rounded, margins entire, coarsely dentate, or crenate, apices acute, faces glabrous or sparsely hairy (at least on abaxial veins); basal petiolate, 15-65 × 4-15 cm; cauline petiolate or sessile, 7-35 × 4-14 cm. Heads borne singly or (2-10) in ± corymbiform arrays. Phyllaries to 1.5 cm (margins ciliate, hairs appressed, apices acute to rounded). Receptacles ovoid to conic; paleae 5-6 mm, apices acute, abaxial tips hairy. Ray florets 7-15; laminae elliptic or oblong, 25-35 × 7-14 mm, abaxially hairy. Discs 15-35 × 12-22 mm. Disc florets 180-300+; corollas yellowish green, 3.5-4 mm; style branches ca. 1.5 mm, apices acute to obtuse. Cypselae 4.5-6 mm; pappi coroniform or of 5-8 scales, to 1.5 mm. 2n = 36.

Flowering late summer-fall. Along streams; of conservation consern; 1000-1600 m; Calif.