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 yellowbrown 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.
not tailed +, rounded +  and obtuse +
connate +  and distinct +
subequal +
scarious +
usually ovate +  and lanceolate +
usually deltate +  and lanceolate +
paniculiform +
indeterminate +  and determinate +
Mark W. Bierner +
(Rafinesque) H. Rock +
pinnatifid +, linear +  and ovate usually entire or pinnately toothed +
decurrent +
Gaillardia amara +
compound +  and simple +
pinnatifid;lobed;spatulate;ovate;spatulate;ovate;oblong;oblanceolate;linear;lanceolate;elliptic +
winged;ribbed;winged;ribbed +
tuberculate +  and rugose +
barbellulate +  and barbellate +
yellow +  and yellowbrown +
0.16 cm1.6 mm <br />0.0016 m <br /> (0.27 cm2.7 mm <br />0.0027 m <br />) +
0.2 cm2 mm <br />0.002 m <br /> (0.27 cm2.7 mm <br />0.0027 m <br />) +
0.08 cm0.8 mm <br />8.0e-4 m <br /> (0.12 cm1.2 mm <br />0.0012 m <br />) +
4-5-angled +  and obpyramidal +
fertile +  and bisexual +
fertile +  and bisexual +
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 +
gland-dotted +
glabrous or +  and sparsely densely hairy +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Roadsides and fields +
discoid +  and radiate +
indeterminate +
homogamous +  and heterogamous +
each +  and sessile +
0.4 cm4 mm <br />0.004 m <br /> (3.4 cm34 mm <br />0.034 m <br />) +
0.5 cm5 mm <br />0.005 m <br /> (0.9 cm9 mm <br />0.009 m <br />) +
globoid;hemispheric;globose +
0.6 cm6 mm <br />0.006 m <br /> (1 cm10 mm <br />0.01 m <br />) +
sessile +  and petiolate +
cauline +, proximal +  and basal +
hairy +  and glabrous +
deltate +
dentate to pinnatifid or palmatifid +  and entire +
connate +  and distinct +
ovate +, oblong +, oblanceolate +, linear +, lanceolate +  and elliptic +
unequal +  and subequal +
2-carpellate +
persistent +
3 cm30 mm <br />0.03 m <br /> (11 cm110 mm <br />0.11 m <br />) +
Flowering (Feb–)Jul–Oct(–Dec) +
9 +  and 34 +
0.65 cm6.5 mm <br />0.0065 m <br /> (1.4 cm14 mm <br />0.014 m <br />) +
0.4 cm4 mm <br />0.004 m <br /> (1 cm10 mm <br />0.01 m <br />) +
bearing subulate enations +, hairy +  and bristly +
ovoid;hemispheric;ovoid;hemispheric;globose;conic +
6 +  and 8 +
aristate +
0.12 cm1.2 mm <br />0.0012 m <br /> (0.18 cm1.8 mm <br />0.0018 m <br />) +
exalbuminous +
not winged +  and branched +
3 (?) +  and 15 (?) +
1 +  and 3 +
appendaged +  and truncate +
hirsutulous +  and glabrous +
papillate +
Helenium tenuifolium +
Helenium amarum var. amarum +
Helenium amarum +
variety +
urceolate +  and campanulate +
dilated +
toothed +  and entire +
10 cm100 mm <br />0.1 m <br /> (100 cm1,000 mm <br />1 m <br />) +