Difference between revisions of "Helenium arizonicum"
J. Wash. Acad. Sci. 27: 388. 1937.
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name=Helenium arizonicum | name=Helenium arizonicum | ||
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|authority=S. F. Blake | |authority=S. F. Blake | ||
|rank=species | |rank=species | ||
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|publication year=1937 | |publication year=1937 | ||
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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, 30–70 cm. Stems usually 1, sparingly branched distally, weakly winged, glabrous or sparsely hairy. Leaves glabrous or sparsely hairy; blades all lance-linear, entire or coarsely toothed. Heads 1–15(–25) per plant, in paniculiform arrays. Peduncles 4–13 cm, glabrous or sparsely to moderately hairy. Involucres globoid to ovoid, 11–16 × 14–20 mm. Phyllaries sparsely to densely hairy. Ray florets 12–18, pistillate, fertile; corollas usually yellow, sometimes yellow with purple streaks, 10–20 × 5–13 mm. Disc florets 300–500(–700+); corollas yellow proximally, yellow to purple to dark blue-purple distally, 3.2–3.6 mm, lobes 5. Cypselae 2–2.9 mm, moderately hairy; pappi of 6–7 entire, aristate scales 1.5–2 mm. 2n = 30.
Phenology: Flowering Jul–Sep.
Habitat: Pine forests, edges of wet places such as bogs, ponds, lakes, ditches
Elevation: 1800–2400 m
Discussion
Selected References
None.