Rudbeckia laciniata var. ampla

(A. Nelson) Cronquist in C. L. Hitchcock et al.

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

Common names: Rocky Mountain cutleaf coneflower
Endemic
Basionyms: Rudbeckia ampla A. Nelson Bull. Torrey Bot. Club 28: 234. 1901
Treatment appears in FNA Volume 21. Treatment on page 49.

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.

hairy +  and glabrous +
not tailed +, rounded +  and obtuse +
connate +  and distinct +
subequal +
scarious +
usually ovate +  and lanceolate +
usually deltate +  and lanceolate +
indeterminate +  and determinate +
Lowell E. Urbatsch +  and Patricia B. Cox +
(A. Nelson) Cronquist in C. L. Hitchcock et al. +
20 cm200 mm <br />0.2 m <br /> (50 cm500 mm <br />0.5 m <br />) +
10 cm100 mm <br />0.1 m <br /> (25 cm250 mm <br />0.25 m <br />) +
cuneate +  and attenuate or cordate +
Rudbeckia ampla +
pinnatifid +
winged;ribbed;winged;ribbed +
tuberculate +  and rugose +
barbellulate +  and barbellate +
sessile +  and petiolate +
sessile +  and petiolate +
8 cm80 mm <br />0.08 m <br /> (40 cm400 mm <br />0.4 m <br />) +
lobed +, mostly lobed +  and pinnatifid +
3cm +  and 20cm +
Rocky Mountain cutleaf coneflower +
yellow +  and yellowish green +
0.35 cm3.5 mm <br />0.0035 m <br /> (0.5 cm5 mm <br />0.005 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 +
1.7 cm17 mm <br />0.017 m <br /> (2 cm20 mm <br />0.02 m <br />) +
fertile +  and bisexual +
2 cm20 mm <br />0.02 m <br /> (3 cm30 mm <br />0.03 m <br />) +
12mm;20mm +
B.C. +, Ariz. +, Colo. +, Mont. +, N.Mex. +, S.Dak. +  and Wyo. +
1700–2700 m +
hairy +  and glabrous +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Wet sites, along streams, open meadows +
discoid +  and radiate +
in loose , corymbiform to paniculiform 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 +
15mm;50mm +
elliptic +  and oblanceolate +
4mm;14mm +
sessile +  and petiolate +
deltate +  and lance-linear +
dentate +  and entire +
2-carpellate +
0.45 cm4.5 mm <br />0.0045 m <br /> (0.65 cm6.5 mm <br />0.0065 m <br />) +
persistent +
0 +  and 2 +
of 4 scales +  and coroniform +
0.7 cm7 mm <br />0.007 m <br /> (?) +
Flowering summer–fall. +
3 +  and 21 +
0 cm0 mm <br />0 m <br /> (2 cm20 mm <br />0.02 m <br />) +
in C. L. Hitchcock et al., Vasc. Pl. Pacif. N.W. +
2.5 cm25 mm <br />0.025 m <br /> (5 cm50 mm <br />0.05 m <br />) +
0.7 cm7 mm <br />0.007 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
bearing subulate enations +, hairy +  and bristly +
pitted +  and smooth +
connate +  and distinct +
unequal +
exalbuminous +
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 subg. Macrocline +
Rudbeckia laciniata var. ampla +
Rudbeckia laciniata +
variety +
cylindric +
serrate +, dentate +  and entire +
50 cm500 mm <br />0.5 m <br /> (300 cm3,000 mm <br />3 m <br />) +
shrub +  and subshrub +