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.

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 +