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.

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

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 +