Helenium autumnale |
Helenium virginicum |
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common sneezeweed |
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Habit | Plants perennial, 2–13 dm. | |
Stems | often with 4+ branches, glabrous or puberulent. |
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Leaves | basal usually withered by flowering; cauline lanceolate-elliptic or oblanceolate, 3–13 cm, bases attenuate or truncate, decurrent; margins generally entire but with some denticulate or serrate-dentate; tips acute; surfaces glabrous or minutely glandular. |
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Involucres | 8–23 mm in diameter. |
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Ray florets | 8–21; corollas 10–23 mm, yellow. |
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Disc florets | 200–400+; corollas 2.5–5 mm, yellow, sometimes brownish distally. |
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Phyllaries | 5–12 mm, linear; surfaces puberulent. |
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Fruits | 1–2 mm, brown, sparsely hairy, pappi of 5–7 aristate scales, 0.5–1.5 mm. |
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Heads | 5–70+, radiate; peduncles moderately to densely hairy. |
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2n | =32, 34, 36. |
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Helenium autumnale |
Helenium virginicum |
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Distribution | ||
Discussion | Riverbanks, lake shores, wet meadows, swamps, marshes. Flowering Jul–Oct. 0–1500 m. Casc, Col, CR, ECas, Sisk, WV. CA, ID, NV, WA; throughout most of North America. Native. This species was formerly divided into variety grandiflorum and variety montanum, but the morphological differences between varieties are too minor and intergrading to merit taxonomic recognition. |
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Source | Flora of Oregon, volume 2, page 278 Kenton Chambers |
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Sibling taxa | ||
Synonyms | Helenium autumnale var. autumnale, Helenium autumnale var. grandiflorum, Helenium autumnale var. montanum | |
Web links |
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