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7a. Rudbeckia laciniata Linnaeus var. ampla (A. Nelson) Cronquist in C. L. Hitchcock et al., Vasc. Pl. Pacif. N.W. 5: 280. 1955.
Rocky Mountain cutleaf coneflower
Rudbeckia ampla A. Nelson, Bull. Torrey Bot. Club 28: 234. 1901
Leaves: basal 20–50 × 10–25 cm, blades pinnately compound to pinnatifid (basal leaflets or lobes often pinnatifid); proximal and mid cauline blades 5–9-lobed; adaxial faces glabrous or sparsely hairy (hairs arching, 1-seriate). Receptacles ovoid; paleae 4.5–6.5 mm. Ray laminae 25–50 × 7–12 mm. Discs (17–)20–30 × 12–20 mm. Cypselae 4–5.5 mm; pappi mostly longer than 0.7 mm. 2n = 38.
Flowering summer–fall. Wet sites, along streams, open meadows; 1700–2700 m; B.C.; Ariz., Colo., Mont., N.Mex., S.Dak., Wyo.
Variety ampla grows west of the Great Plains. It is introduced in British Columbia.
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