Difference between revisions of "Helenium thurberi"
Proc. Amer. Acad. Arts 19: 32. 1883.
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name=Helenium thurberi | name=Helenium thurberi | ||
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|authority=A. Gray | |authority=A. Gray | ||
|rank=species | |rank=species | ||
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|publication year=1883 | |publication year=1883 | ||
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|tribe=Asteraceae tribe Heliantheae | |tribe=Asteraceae tribe Heliantheae | ||
|subtribe=Asteraceae (tribe Heliantheae) subtribe Gaillardiinae | |subtribe=Asteraceae (tribe Heliantheae) subtribe Gaillardiinae | ||
Latest revision as of 20:08, 5 November 2020
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
Discussion
Selected References
None.