Difference between revisions of "Helenium quadridentatum"
Actes Soc. Hist. Nat. Paris 1: 22, plate 4. 1792.
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name=Helenium quadridentatum | name=Helenium quadridentatum | ||
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|authority=Labillardière | |authority=Labillardière | ||
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|publication year=1792 | |publication year=1792 | ||
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| − | |source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/ | + | |source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/eaa6e58056e40c9ef614d8f47aea294977a1a5e9/coarse_grained_fna_xml/V19-20-21/V21_1089.xml |
|tribe=Asteraceae tribe Heliantheae | |tribe=Asteraceae tribe Heliantheae | ||
|subtribe=Asteraceae (tribe Heliantheae) subtribe Gaillardiinae | |subtribe=Asteraceae (tribe Heliantheae) subtribe Gaillardiinae | ||
Revision as of 19:32, 16 December 2019
Annuals, 30–100 cm. Stems usually 1, branched distally, moderately to strongly winged, glabrous or sparsely hairy. Leaves glabrous or sparsely hairy; blades narrowly elliptic to lance-linear, usually entire; proximal blades sometimes pinnately lobed. Heads 5–15(–50+) per plant, in paniculiform arrays. Peduncles 3–13 cm, sparsely to moderately hairy. Involucres ovoid to conic, 7–11(–14) × 6–11 mm. Phyllaries (connate proximally) sparsely to densely hairy. Ray florets 10–15, pistillate, fertile; corollas yellow, 7–12.4 × 4–8.8 mm. Disc florets 225–500+; corollas yellow proximally, yellow to brown to reddish brown distally, 1.1–1.8 mm, lobes 4. Cypselae 0.6–1.2 mm, moderately hairy; pappi of usually 6 entire, non-aristate scales 0.1–0.3 mm. 2n = 26.
Phenology: Flowering Mar–Jun (year round).
Habitat: Sandy or clay soils, ditches, around ponds and lakes, along streams
Elevation: 0–1800 m
Distribution
Ala., La., Miss., Pa., Tex., Mexico, West Indies (Cuba), Central America (Belize, Guatemala).
Discussion
Helenium quadridentatum is introduced in Pennsylvania.
Selected References
None.