Rudbeckia nitida

Nuttall

J. Acad. Nat. Sci. Philadelphia 7: 78. 1834.

Common names: Shiny coneflower St. John’s or black-eyed Susan
EndemicConservation concern
Synonyms: Rudbeckia glabra de Candolle
Treatment appears in FNA Volume 21. Treatment on page 51. Mentioned on page 47.

Perennials, to 140 cm (rhizomatous, roots fibrous). Leaves green (lightly glaucous), blades elliptic to lanceolate (not lobed), leathery, bases attenuate to cuneate, margins crenate, entire, or toothed, apices acute, faces glabrous or sparsely hairy; basal petiolate, 15–60 × 2–8 cm; cauline petiolate or sessile, 5–50 × 2–9 cm. Heads borne singly or in ± corymbiform arrays. Phyllaries to 2 cm (margins sometimes ciliate, sparsely hairy). Receptacles ovate to columnar; paleae (recurved prior to flowering, erect to spreading in young heads) 5–6 mm, apices acute to acuminate, abaxial tips hairy. Ray-florets 8–15; laminae oblong to oblanceolate, 12–60 × 5–15 mm, abaxially sparsely hairy. Discs 10–30 × 12–20 mm. Disc-florets 200–300+; corollas yellowish green proximally, maroon distally, 3.5–4.5 mm; style-branches ca. 1.2 mm, apices acute to acuminate. Cypselae 3–5.5 mm; pappi ± coroniform, to 2 mm. 2n = 36.


Phenology: Flowering spring–summer.
Habitat: Wet pinelands, swales, ditches, bayous
Elevation: 0–40 m

Discussion

Of conservation concern.

Rudbeckia nitida grows in northern Florida and southern Georgia (a report for Alabama has not been confirmed). It is cultivated as an ornamental. According to R. Kral (1983), it is threatened or endangered and is associated with savanna or bog dicots and monocots, particularly Eriocaulon, Sarracenia, Lachnocaulon, Rhexia, Xyris, and the composites Coreopsis, Helianthus, and Liatris.

Selected References

None.

Lower Taxa

None.

... more about "Rudbeckia nitida"
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 +
Nuttall +
15 cm150 mm <br />0.15 m <br /> (60 cm600 mm <br />0.6 m <br />) +
2 cm20 mm <br />0.02 m <br /> (8 cm80 mm <br />0.08 m <br />) +
attenuate +  and cuneate +
compound +  and simple +
elliptic;lanceolate +
winged;ribbed;winged;ribbed +
tuberculate +  and rugose +
barbellulate +  and barbellate +
sessile +  and petiolate +
sessile +  and petiolate +
5 cm50 mm <br />0.05 m <br /> (50 cm500 mm <br />0.5 m <br />) +
2cm +  and 9cm +
Shiny coneflower +  and St. John’s or black-eyed Susan +
maroon +  and yellowish green +
0.35 cm3.5 mm <br />0.0035 m <br /> (0.45 cm4.5 mm <br />0.0045 m <br />) +
0.3 cm3 mm <br />0.003 m <br /> (0.35 cm3.5 mm <br />0.0035 m <br />) +
hairy +  and glabrous +
flattened +, fusiform-terete +  and obpyramidal +
fertile +  and bisexual +
6 cm60 mm <br />0.06 m <br /> (8 cm80 mm <br />0.08 m <br />) +
fertile +  and bisexual +
1 cm10 mm <br />0.01 m <br /> (3 cm30 mm <br />0.03 m <br />) +
12mm;20mm +
Fla. +  and Ga. +
0–40 m +
hairy +  and glabrous +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Wet pinelands, swales, ditches, bayous +
discoid +  and radiate +
in more or less corymbiform 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 +
12mm;60mm +
oblong +  and oblanceolate +
5mm;15mm +
sessile +  and petiolate +
deltate +  and lance-linear +
dentate to pinnatifid or palmatifid +  and entire +
toothed +, entire +  and crenate +
2-carpellate +
0.5 cm5 mm <br />0.005 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
persistent +
0 +  and 2 +
coroniform +
0 cm0 mm <br />0 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
Flowering spring–summer. +
3 +  and 21 +
0 cm0 mm <br />0 m <br /> (2 cm20 mm <br />0.02 m <br />) +
J. Acad. Nat. Sci. Philadelphia +
bearing subulate enations +, hairy +  and bristly +
pitted +  and smooth +
ovate;columnar +
connate +  and distinct +
2 +  and 6 +
unequal +
exalbuminous +
Endemic +  and Conservation concern +
purplish +, bluish green +  and green +
appendaged +  and truncate +
hirsutulous +  and glabrous +
papillate +
0.3 cm3 mm <br />0.003 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
Rudbeckia glabra +
Rudbeckia nitida +
Rudbeckia sect. Macrocline +
species +
cylindric +
serrate +, dentate +  and entire +
0 cm0 mm <br />0 m <br /> (140 cm1,400 mm <br />1.4 m <br />) +
shrub +  and subshrub +