Difference between revisions of "Rudbeckia auriculata"
Rhodora 77: 49. 1975.
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Latest revision as of 23:57, 29 July 2020
Perennials, to 300 cm (rhizomatous, roots fibrous). Leaves green, oblong to elliptic or ovate to pandurate, herbaceous, margins crenate, dentate, entire or serrate, apices acute, faces scabrous, abaxial often glabrescent; basal petiolate, 20–65 × 8–20 cm, bases attenuate; cauline sessile, 15–40 × 4–15 cm, bases auriculate to truncate. Heads (usually 10+) in paniculiform arrays. Phyllaries to 1 cm. Receptacles conic to ovoid; paleae 4–6 mm, apices obtuse to acute, abaxial tips hairy. Ray-florets 8–14; laminae oblanceolate, 18–30 × 4–8 mm, abaxially sparsely hairy. Discs 12–16 × 10–18 mm. Disc-florets 150–200; corollas brown-purple, 3.5–4.2 mm; anther appendages glabrous or glanddotted; style-branches to ca. 1.8 mm, apices acute to obtuse. Cypselae 3.5–5 mm; pappi of 4–6, unequal scales, to 2 mm. 2n = 36.
Phenology: Flowering summer–fall.
Habitat: Sandy stream banks, wet roadsides
Elevation: 10–90 m
Distribution
Ala., Fla., Ga.
Discussion
Of conservation concern.
Rudbeckia auriculata is known from eight sites in Alabama, one in Florida, and one in Georgia.
Selected References
None.