Helenium amarum

(Rafinesque) H. Rock

Rhodora 59: 131. 1957.

Common names: Yellowdicks fiveleaf sneezeweed
Basionym: Gaillardia amara Rafinesque Fl. Ludov., 69. 1817 (as Galardia)
Synonyms: Helenium tenuifolium Nuttall
Treatment appears in FNA Volume 21. Treatment on page 428. Mentioned on page 427.

Annuals, 10–100 cm. Stems 1–3 (–15), usually branched distally, not winged, glabrous or sparsely hairy. Leaves glabrous or sparsely hairy; basal blades linear to ovate, entire or pinnately toothed or lobed to pinnatifid; mid and distal blades linear, entire. Heads (1–) 10–150 (–250+) per plant, in paniculiform arrays. Peduncles 3–11 cm, sparsely hairy. Involucres hemispheric to globose or globoid, 5–9 × 6–10 mm. Phyllaries moderately to densely hairy. Ray-florets 8–10, pistillate, fertile; corollas yellow, 4.5–14 × 2–10 mm. Disc-florets 75–250+; corollas yellow proximally, yellow to yellowbrown or purple distally, 1.6–2.7 × 0.8–1.2 mm, lobes 5. Cypselae 0.7–1.3 mm, moderately to densely hairy; pappi of 6–8 entire, aristate scales 1–1.8 mm.

Distribution

V21-1067-distribution-map.gif

Ala., Ark., Calif., D.C., Fla., Ga., Ind., Kans., La., Mich., Miss., Mo., N.C., Okla., Pa., S.C., Tenn., Tex., Va., n Mexico

Discussion

Varieties 2 (2 in the flora).

Selected References

None.

Key

1 Basal and proximal cauline leaves usually withered by flowering; basal blades usually entire or pinnately toothed, sometimes pinnatifid; proximal blades usually entire, sometimes pinnately toothed; disc corollas yellow to yellow-brown distally Helenium amarum var. amarum
1 Basal and proximal cauline leaves often present at, sometimes withered by, flowering; basal blades pinnatifid; proximal blades entire or pinnately toothed or lobed to pinnatifid; disc corollas purple distally Helenium amarum var. badium
... more about "Helenium amarum"
not tailed +, rounded +  and obtuse +
connate +  and distinct +
subequal +
scarious +
usually ovate +  and lanceolate +
usually deltate +  and lanceolate +
paniculiform +
indeterminate +  and determinate +
Mark W. Bierner +
(Rafinesque) H. Rock +
linear +  and ovate entire or pinnately toothed or lobed +
decurrent +
Gaillardia amara +
compound +  and simple +
pinnatifid;lobed;spatulate;ovate;spatulate;ovate;oblong;oblanceolate;linear;lanceolate;elliptic +
winged;ribbed;winged;ribbed +
tuberculate +  and rugose +
barbellulate +  and barbellate +
Yellowdicks +  and fiveleaf sneezeweed +
yellow +  and yellowbrown or purple +
0.16 cm1.6 mm <br />0.0016 m <br /> (0.27 cm2.7 mm <br />0.0027 m <br />) +
0.08 cm0.8 mm <br />8.0e-4 m <br /> (0.12 cm1.2 mm <br />0.0012 m <br />) +
4-5-angled +  and obpyramidal +
fertile +  and bisexual +
fertile +  and bisexual +
Ala. +, Ark. +, Calif. +, D.C. +, Fla. +, Ga. +, Ind. +, Kans. +, La. +, Mich. +, Miss. +, Mo. +, N.C. +, Okla. +, Pa. +, S.C. +, Tenn. +, Tex. +, Va. +  and n Mexico +
gland-dotted +
glabrous or +  and sparsely densely hairy +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
discoid +  and radiate +
indeterminate +
homogamous +  and heterogamous +
each +  and sessile +
0.4 cm4 mm <br />0.004 m <br /> (3.4 cm34 mm <br />0.034 m <br />) +
0.5 cm5 mm <br />0.005 m <br /> (0.9 cm9 mm <br />0.009 m <br />) +
globoid;hemispheric;globose +
0.6 cm6 mm <br />0.006 m <br /> (1 cm10 mm <br />0.01 m <br />) +
sessile +  and petiolate +
hairy +  and glabrous +
deltate +
dentate to pinnatifid or palmatifid +  and entire +
connate +  and distinct +
ovate +, oblong +, oblanceolate +, linear +, lanceolate +  and elliptic +
unequal +  and subequal +
2-carpellate +
persistent +
3 cm30 mm <br />0.03 m <br /> (11 cm110 mm <br />0.11 m <br />) +
9 +  and 34 +
bearing subulate enations +, hairy +  and bristly +
ovoid;hemispheric;ovoid;hemispheric;globose;conic +
6 +  and 8 +
aristate +
0.1 cm1 mm <br />0.001 m <br /> (0.18 cm1.8 mm <br />0.0018 m <br />) +
exalbuminous +
not winged +  and branched +
3 (?) +  and 15 (?) +
1 +  and 3 +
appendaged +  and truncate +
hirsutulous +  and glabrous +
papillate +
Helenium tenuifolium +
Helenium amarum +
Helenium +
species +
urceolate +  and campanulate +
dilated +
toothed +  and entire +
10 cm100 mm <br />0.1 m <br /> (100 cm1,000 mm <br />1 m <br />) +
shrub +  and subshrub +