Helenium amarum var. amarum

Treatment appears in FNA Volume 21. Treatment on page 428.

Plants (10–)20–60(–100) cm. Leaves: basal and proximal cauline usually withered by flowering; basal blades linear to ovate, usually entire or pinnately toothed sometimes pinnatifid; proximal blades usually linear, usually entire, sometimes pinnately toothed. Ray corollas 6.5–14 × 4–10 mm. Disc florets 75–150+; corollas yellow to yellow-brown distally, 2–2.7 mm. Cypselae 0.9–1.3 mm; pappi of 6–8 scales 1.2–1.8 mm. 2n = 30.


Phenology: Flowering (Feb–)Jul–Oct(–Dec)
Habitat: Roadsides and fields
Elevation: 20–400 m

Distribution

V21-1068-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.

Discussion

Variety amarum is introduced in California.

Selected References

None.

Lower Taxa

None.
Mark W. Bierner +
(Rafinesque) H. Rock +
Gaillardia amara +
Ala. +, Ark. +, Calif. +, D.C. +, Fla. +, Ga. +, Ind. +, Kans. +, La. +, Mich. +, Miss. +, Mo. +, N.C. +, Okla. +, Pa. +, S.C. +, Tenn. +, Tex. +  and Va. +
20–400 m +
Roadsides and fields +
Flowering (Feb–)Jul–Oct(–Dec) +
Helenium tenuifolium +
Helenium amarum var. amarum +
Helenium amarum +
variety +