Difference between revisions of "Helenium amarum"

(Rafinesque) H. Rock

Rhodora 59: 131. 1957.

Common names: Yellowdicks fiveleaf sneezeweed
Basionym: Gaillardia amara Rafinesque Fl. Ludov., 69. 1817 (as Galardia)
Synonyms: Helenium tenuifolium Nuttall
Treatment appears in FNA Volume 21. Treatment on page 428. Mentioned on page 427.
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Latest revision as of 18:21, 6 November 2020

Annuals, 10–100 cm. Stems 1–3(–15), usually branched distally, not winged, glabrous or sparsely hairy. Leaves glabrous or sparsely hairy; basal blades linear to ovate, entire or pinnately toothed or lobed to pinnatifid; mid and distal blades linear, entire. Heads (1–)10–150(–250+) per plant, in paniculiform arrays. Peduncles 3–11 cm, sparsely hairy. Involucres hemispheric to globose or globoid, 5–9 × 6–10 mm. Phyllaries moderately to densely hairy. Ray florets 8–10, pistillate, fertile; corollas yellow, 4.5–14 × 2–10 mm. Disc florets 75–250+; corollas yellow proximally, yellow to yellow-brown or purple distally, 1.6–2.7 × 0.8–1.2 mm, lobes 5. Cypselae 0.7–1.3 mm, moderately to densely hairy; pappi of 6–8 entire, aristate scales 1–1.8 mm.

Distribution

V21-1067-distribution-map.gif

Ala., Ark., Calif., D.C., Fla., Ga., Ind., Kans., La., Mich., Miss., Mo., N.C., Okla., Pa., S.C., Tenn., Tex., Va., n Mexico.

Discussion

Varieties 2 (2 in the flora).

Selected References

None.

Key

1 Basal and proximal cauline leaves usually withered by flowering; basal blades usually entire or pinnately toothed, sometimes pinnatifid; proximal blades usually entire, sometimes pinnately toothed; disc corollas yellow to yellow-brown distally Helenium amarum var. amarum
1 Basal and proximal cauline leaves often present at, sometimes withered by, flowering; basal blades pinnatifid; proximal blades entire or pinnately toothed or lobed to pinnatifid; disc corollas purple distally Helenium amarum var. badium
... more about "Helenium amarum"
Mark W. Bierner +
(Rafinesque) H. Rock +
Gaillardia amara +
Yellowdicks +  and fiveleaf sneezeweed +
Ala. +, Ark. +, Calif. +, D.C. +, Fla. +, Ga. +, Ind. +, Kans. +, La. +, Mich. +, Miss. +, Mo. +, N.C. +, Okla. +, Pa. +, S.C. +, Tenn. +, Tex. +, Va. +  and n Mexico. +
Helenium tenuifolium +
Helenium amarum +
Helenium +
species +