Rudbeckia subtomentosa

Pursh

Fl. Amer. Sept. 2: 575. 1813.

Common names: Sweet coneflower
Endemic
Treatment appears in FNA Volume 21. Treatment on page 59. Mentioned on page 53.

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

V21-129-distribution-map.gif

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.

Lower Taxa

None.

... more about "Rudbeckia subtomentosa"
not tailed +, rounded +  and obtuse +
connate +  and distinct +
subequal +
scarious +
usually ovate +  and lanceolate +
usually deltate +  and lanceolate +
corymbiform +  and paniculiform +
indeterminate +  and determinate +
Lowell E. Urbatsch +  and Patricia B. Cox +
15 cm150 mm <br />0.15 m <br /> (30 cm300 mm <br />0.3 m <br />) +
3 cm30 mm <br />0.03 m <br /> (10 cm100 mm <br />0.1 m <br />) +
truncate +  and cuneate or rounded +
compound +  and simple +
ovate;elliptic +
winged;ribbed;winged;ribbed +
tuberculate +  and rugose +
barbellulate +  and barbellate +
ovate +  and elliptic +
Sweet coneflower +
yellowish green +
0.3 cm3 mm <br />0.003 m <br /> (0.42 cm4.2 mm <br />0.0042 m <br />) +
0.35 cm3.5 mm <br />0.0035 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
hairy +  and glabrous +
flattened +, fusiform-terete +  and obpyramidal +
fertile +  and bisexual +
fertile +  and bisexual +
1 cm10 mm <br />0.01 m <br /> (1.7 cm17 mm <br />0.017 m <br />) +
5mm;15mm +
Ark. +, Conn. +, Ill. +, Ind. +, Iowa +, Kans. +, Ky. +, La. +, Mass. +, Mich. +, Miss. +, Mo. +, N.Y. +, N.C. +, Okla. +, Tenn. +, Tex. +  and Wis. +
20–300 m +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Mesic to wet prairies, stream banks, and woodland openings +
discoid +  and radiate +
in loose , corymbiform to paniculiform arrays +  and singly +
indeterminate +
homogamous +  and heterogamous +
each +  and sessile +
0.1 cm1 mm <br />0.001 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
fusiform;turbinate or broadly campanulate +
20mm;40mm +
linear +  and oblanceolate +
sessile +  and petiolate +
not glaucous +
greenish;yellowish +
deltate +  and lance-linear +
serrate +, entire +  and dentate +
denticulate +  and serrate +
2-carpellate +
0.4 cm4 mm <br />0.004 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
persistent +
0 +  and 2 +
coroniform +
0 cm0 mm <br />0 m <br /> (0.02 cm0.2 mm <br />2.0e-4 m <br />) +
Flowering late summer–fall. +
3 +  and 21 +
0 cm0 mm <br />0 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
3 cm30 mm <br />0.03 m <br /> (25 cm250 mm <br />0.25 m <br />) +
1 cm10 mm <br />0.01 m <br /> (15 cm150 mm <br />0.15 m <br />) +
Fl. Amer. Sept. +
bearing subulate enations +, hairy +  and bristly +
pitted +  and smooth +
conic;hemispheric +
connate +  and distinct +
2 +  and 5 +
exalbuminous +
appendaged +  and truncate +
hirsutulous +  and glabrous +
papillate +
0.3 cm3 mm <br />0.003 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
Compositae +
Rudbeckia subtomentosa +
Rudbeckia sect. Rudbeckia +
species +
cylindric +
entire +  and toothed +
100 cm1,000 mm <br />1 m <br /> (200 cm2,000 mm <br />2 m <br />) +
0 cm0 mm <br />0 m <br /> (200 cm2,000 mm <br />2 m <br />) +
shrub +  and subshrub +