Helenium linifolium

Rydberg in N. L. Britton et al.

in N. L. Britton et al., N. Amer. Fl. 34: 125. 1915.

Common names: Slimleaf sneezeweed
Endemic
Treatment appears in FNA Volume 21. Treatment on page 433. Mentioned on page 428, 430.
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Annuals, 20–80 cm. Stems usually 1, branched distally, narrowly winged, sparsely hairy proximally, moderately hairy distally. Leaves glabrous or sparsely hairy (basal withered by flowering); proximal blades lance-linear, usually coarsely or irregularly laciniate; mid and distal blades lance-linear to linear, entire. Heads 5–50 (–100+) per plant, in paniculiform arrays. Peduncles 2–8 cm, sparsely to moderately hairy. Involucres globose to slightly ovoid, 6–11 (–13) × 6–11 (–13) mm. Phyllaries moderately hairy. Ray-florets 8–9, pistillate, fertile; corollas yellow throughout or red proximally and yellow distally or red throughout, 6–12 × 3–8 mm. Disc-florets 150–300 (–500+); corollas yellow-green proximally, brown to purple distally, 2.5–3.2 mm, lobes 5. Cypselae 1–1.2 mm, moderately hairy; pappi of 6 (–7) entire, aristate scales 2–2.5 mm. 2n = 28.


Phenology: Flowering (Feb–)Mar–May(–Jul).
Habitat: Sandy soils, ditches, open pastures, edges of ponds and streams
Elevation: 10–200 m

Distribution

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Tex.

Discussion

Selected References

None.

Lower Taxa

None.
... more about "Helenium linifolium"
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 +
Rydberg in N. L. Britton et al. +
decurrent +
compound +  and simple +
pinnatifid;lobed;spatulate;ovate;spatulate;ovate;oblong;oblanceolate;linear;lanceolate;elliptic +
winged;ribbed;winged;ribbed +
tuberculate +  and rugose +
barbellulate +  and barbellate +
Slimleaf sneezeweed +
brown +  and purple +
0.6 cm6 mm <br />0.006 m <br /> - 1.2 cm12 mm <br />0.012 m <br /> +
0.25 cm2.5 mm <br />0.0025 m <br /> - 0.32 cm3.2 mm <br />0.0032 m <br /> +
0.3 cm3 mm <br />0.003 m <br /> - 0.8 cm8 mm <br />0.008 m <br /> +
4-5-angled +  and obpyramidal +
fertile +  and bisexual +
fertile +  and bisexual +
10–200 m +
gland-dotted +
glabrous or +  and sparsely densely hairy +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Sandy soils, ditches, open pastures, edges of ponds and streams +
discoid +  and radiate +
indeterminate +
homogamous +  and heterogamous +
each +  and sessile +
1.1 cm11 mm <br />0.011 m <br /> - 1.3 cm13 mm <br />0.013 m <br /> +
1.1 cm11 mm <br />0.011 m <br /> - 1.3 cm13 mm <br />0.013 m <br /> +
0.4 cm4 mm <br />0.004 m <br /> - 3.4 cm34 mm <br />0.034 m <br /> +
0.6 cm6 mm <br />0.006 m <br /> - 1.1 cm11 mm <br />0.011 m <br /> +
globose;slightly ovoid +
0.6 cm6 mm <br />0.006 m <br /> - 1.1 cm11 mm <br />0.011 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 +
2 cm20 mm <br />0.02 m <br /> - 8 cm80 mm <br />0.08 m <br /> +
Flowering - Feb–Mar–May - –Jul. +
9 +  and 34 +
in N. L. Britton et al., N. Amer. Fl. +
bearing subulate enations +, hairy +  and bristly +
ovoid;hemispheric;ovoid;hemispheric;globose;conic +
aristate +
0.2 cm2 mm <br />0.002 m <br /> - 0.25 cm2.5 mm <br />0.0025 m <br /> +
exalbuminous +
winged +  and branched +
1 - ? +  and 10 - ? +
appendaged +  and truncate +
hirsutulous +  and glabrous +
papillate +
Compositae +
Helenium linifolium +
Helenium +
species +
urceolate +  and campanulate +
dilated +
toothed +  and entire +
20 cm200 mm <br />0.2 m <br /> - 80 cm800 mm <br />0.8 m <br /> +
shrub +  and subshrub +