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sweet coneflower

Habit 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.

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.

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.

Phyllaries

to 1.5 cm (faces hairy and ± gland-dotted).

Heads

(8–25) in loose, corymbiform to paniculiform arrays.

Cypselae

2–3.5 mm;

pappi coroniform, to ca. 0.2 mm.

Discs

10–17 × 5–15 mm.

2n

= 38.

Rudbeckia subtomentosa

Phenology Flowering late summer–fall.
Habitat Mesic to wet prairies, stream banks, and woodland openings
Elevation 20–300 m (100–1000 ft)
Distribution
from FNA
AR; CT; IA; IL; IN; KS; KY; LA; MA; MI; MO; MS; NC; NY; OK; TN; TX; WI
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[BONAP county map]
Discussion

Rudbeckia subtomentosa is often cultivated as an ornamental.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Source FNA vol. 21, p. 59.
Parent taxa Asteraceae > tribe Heliantheae > subtribe Rudbeckiinae > Rudbeckia > sect. Rudbeckia
Sibling taxa
R. alpicola, R. amplexicaulis, R. auriculata, R. californica, R. fulgida, R. glaucescens, R. graminifolia, R. grandiflora, R. heliopsidis, R. hirta, R. klamathensis, R. laciniata, R. maxima, R. missouriensis, R. mohrii, R. mollis, R. montana, R. nitida, R. occidentalis, R. scabrifolia, R. texana, R. triloba
Name authority Pursh: Fl. Amer. Sept. 2: 575. (1813)
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