Rudbeckia subtomentosa Pursh

Rudbeckia subtomentosa is often cultivated as an ornamental.

Perennials, to 200 cm (rhizomatous, rhizomes stout). Stems densely hirsute (hairs mostly antrorse, to 0.5 mm). Leaves: blades ovate to elliptic (not lobed), margins denticulate to serrate, apices acute to obtuse or acuminate, faces densely hirsute and gland-dotted (glands fewer adaxially); basal 15–30 × 3–10 cm, bases attenuate; cauline petiolate, ovate to elliptic, proximal 3–25 × 1–15 cm, usually 3–5-lobed, bases truncate to cuneate or rounded. Heads (8–25) in loose, corymbiform to paniculiform arrays. Phyllaries to 1.5 cm (faces hairy and ± gland-dotted). Receptacles conic to hemispheric; paleae 4–6 mm, apices acute, abaxial tips hirsute and gland-dotted. Ray florets 10–16; laminae (yellow to yellow-orange) linear to oblanceolate, 20–40 × 5–8 mm, abaxially sparsely hairy, abundantly gland-dotted. Discs 10–17 × 5–15 mm. Disc florets 200–400+; corollas yellowish green on basal ¹/2, otherwise brown-purple, 3–4.2 mm; style branches ca. 1 mm, apices acute. Cypselae 2–3.5 mm; pappi coroniform, to ca. 0.2 mm. 2n = 38.

Rudbeckia subtomentosa, the sweet coneflower, is a flowering plant in the family Asteraceae and is found in the central United States.

Rudbeckia subtomentosa là một loài thực vật có hoa trong họ Cúc. Loài này được Pursh miêu tả khoa học đầu tiên.