Rudbeckia subtomentosa
Fl. Amer. Sept. 2: 575. 1813.
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 glanddotted (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 ± glanddotted). Receptacles conic to hemispheric; paleae 4–6 mm, apices acute, abaxial tips hirsute and glanddotted. Ray-florets 10–16; laminae (yellow to yellow-orange) linear to oblanceolate, 20–40 × 5–8 mm, abaxially sparsely hairy, abundantly glanddotted. 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.
Phenology: Flowering late summer–fall.
Habitat: Mesic to wet prairies, stream banks, and woodland openings
Elevation: 20–300 m
Distribution
Ark., Conn., Ill., Ind., Iowa, Kans., Ky., La., Mass., Mich., Miss., Mo., N.Y., N.C., Okla., Tenn., Tex., Wis.
Discussion
Rudbeckia subtomentosa is often cultivated as an ornamental.
Selected References
None.