Rudbeckia laciniata var. ampla

(A. Nelson) Cronquist

in C. L. Hitchcock et al., Vasc. Pl. Pacif. N.W. 5: 280. 1955.

Common names: Rocky Mountain cutleaf coneflower
Endemic
Basionym: Rudbeckia ampla A. Nelson Bull. Torrey Bot. Club 28: 234. 1901
Treatment appears in FNA Volume 21. Treatment on page 49.
Revision as of 20:15, 5 November 2020 by imported>Volume Importer
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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.


Phenology: Flowering summer–fall.
Habitat: Wet sites, along streams, open meadows
Elevation: 1700–2700 m

Distribution

V21-96-distribution-map.gif

B.C., Ariz., Colo., Mont., N.Mex., S.Dak., Wyo.

Discussion

Variety ampla grows west of the Great Plains. It is introduced in British Columbia.

Selected References

None.

Lower Taxa

None.
Lowell E. Urbatsch +  and Patricia B. Cox +
(A. Nelson) Cronquist +
Rudbeckia ampla +
Rocky Mountain cutleaf coneflower +
B.C. +, Ariz. +, Colo. +, Mont. +, N.Mex. +, S.Dak. +  and Wyo. +
1700–2700 m +
Wet sites, along streams, open meadows +
Flowering summer–fall. +
in C. L. Hitchcock et al., Vasc. Pl. Pacif. N.W. +
Rudbeckia subg. Macrocline +
Rudbeckia laciniata var. ampla +
Rudbeckia laciniata +
variety +