Helenium linifolium

Rydberg

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.