Description ³

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.

Sources and Credits

1. (c) Photo by David J. Stang, some rights reserved (CC BY-SA), http://commons.wikimedia.org/wiki/File:Rudbeckia_nitida_Herbstonne_3zz.jpg
2. (c) rachelgreenbelt, some rights reserved (CC BY-NC-SA), https://www.flickr.com/photos/rachelgreenbelt/12266089076/
3. (c) Missouri Botanical Garden, 4344 Shaw Boulevard, St. Louis, MO, 63110 USA, some rights reserved (CC BY-NC-SA), http://eol.org/data_objects/4957803

More Info

• iNat taxon page
• Biodiversity Heritage Library
• BOLD Systems BIN search
• eFloras.org
• Flora of North America (beta)
• Global Biodiversity Information Facility (GBIF)
• HOSTS - a Database of the World's Lepidopteran Hostplants
• IPNI (with links to POWO, WFO, and BHL)
• NatureServe Explorer 2.0
• SEINet Symbiota portals
• Tropicos
• USDA PLANTS database
• World Flora Online

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