Helenium thurberi

A. Gray

Proc. Amer. Acad. Arts 19: 32. 1883.

Common names: Thurber’s sneezeweed
Treatment appears in FNA Volume 21. Treatment on page 434. Mentioned on page 428, 432.

Annuals, 40–100 cm. Stems usually 1, branched distally, moderately winged, sparsely hairy proximally, moderately hairy distally. Leaves glabrous or sparsely hairy (basal leaves withered by flowering); proximal blades lanceolate to lance-linear, usually irregularly laciniate; mid and distal blades lance-linear, entire. Heads 10–75(–120+) per plant, in paniculiform arrays. Peduncles 3–10 cm, moderately hairy. Involucres ovoid to conic, 6–10 × 5–10 mm. Phyllaries (strongly connate proximally), moderately hairy. Ray florets 0. Disc florets 225–500+; corollas yellow-green proximally, brown to reddish brown distally, 1–1.3 mm, lobes 4. Cypselae 0.9–1.2(–1.5) mm, moderately hairy; pappi of 6(–7) entire, non-aristate scales 0.2–0.5 mm. 2n = 26.

Phenology: Flowering (Mar–)May–Jul(–Sep).
Habitat: Ditches, around ponds, along streams, moist fields
Elevation: 30–1600 m


Selected References


Lower Taxa