Helenium flexuosum

Rafinesque

New Fl. 4: 81. 1838.

Common names: Purplehead sneezeweed hélénie nudiflore
Endemic
Synonyms: Helenium nudiflorum Nuttall
Treatment appears in FNA Volume 21. Treatment on page 429. Mentioned on page 427, 430.

Perennials, 30–100 cm. Stems usually 1, usually branched distally, strongly winged, glabrous or sparsely hairy proximally, sparsely to moderately hairy distally. Leaves glabrous or sparsely to moderately hairy; basal blades oblanceolate to obovate or spatulate, entire or serrate; proximal and mid-blades oblanceolate to lanceolate, entire or toothed; distal blades lanceolate to lance-linear, entire. Heads (1–) 5–50 (–80+) per plant, in paniculiform arrays. Peduncles 3–10 cm, sparsely to moderately hairy. Involucres globoid to usually ovoid, 8–17 × 9–17 mm. Phyllaries (connate proximally) moderately to densely hairy. Ray-florets usually 8–13, neuter, sometimes 0; corollas yellow to reddish-brown to red to purple, 10–20 × 5–10 mm. Disc-florets 250–500 (–700+); corollas yellow proximally and purple distally or purple throughout, 2.3–3.7 mm, lobes 4 (–5). Cypselae 1–1.2 mm, moderately hairy; pappi of 5–6 entire, aristate scales 0.6–1 (–1.7) mm. 2n = 28.


Phenology: Flowering (Apr–)May–Jul(–Oct).
Habitat: Ditches, fields, washes, along streams
Elevation: 10–900 m

Distribution

V21-1073-distribution-map.gif

N.S., Ont., Que., Ala., Ark., Fla., Ga., Ill., Ind., Ky., La., Md., Mass., Mich., Miss., Mo., N.J., N.C., Ohio, Okla., Pa., S.C., Tenn., Tex., Va., W.Va., Wis.

Discussion

It has been suggested that Helenium flexuosum may be of hybrid origin from H. campestre (perennial, 2n = 28) and some member of Helenium sect. Tetrodus (H. F. L. Rock 1957). The only member of sect. Tetrodus that has a chromosome number of 2n = 28 is H. linifolium, an annual from southern Texas.

Selected References

None.

Lower Taxa

None.
... more about "Helenium flexuosum"
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 +
oblanceolate +  and obovate or spatulate +
decurrent +
compound +  and simple +
pinnatifid;lobed;spatulate;ovate;spatulate;ovate;oblong;oblanceolate;linear;lanceolate;elliptic +
winged;ribbed;winged;ribbed +
tuberculate +  and rugose +
barbellulate +  and barbellate +
Purplehead sneezeweed +  and hélénie nudiflore +
yellow +  and reddish-brown +
1 cm10 mm <br />0.01 m <br /> (2 cm20 mm <br />0.02 m <br />) +
0.23 cm2.3 mm <br />0.0023 m <br /> (0.37 cm3.7 mm <br />0.0037 m <br />) +
0.5 cm5 mm <br />0.005 m <br /> (1 cm10 mm <br />0.01 m <br />) +
4-5-angled +  and obpyramidal +
fertile +  and bisexual +
fertile +  and bisexual +
N.S. +, Ont. +, Que. +, Ala. +, Ark. +, Fla. +, Ga. +, Ill. +, Ind. +, Ky. +, La. +, Md. +, Mass. +, Mich. +, Miss. +, Mo. +, N.J. +, N.C. +, Ohio +, Okla. +, Pa. +, S.C. +, Tenn. +, Tex. +, Va. +, W.Va. +  and Wis. +
10–900 m +
gland-dotted +
glabrous or +  and sparsely densely hairy +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Ditches, fields, washes, along streams +
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 />) +
0.8 cm8 mm <br />0.008 m <br /> (1.7 cm17 mm <br />0.017 m <br />) +
0.9 cm9 mm <br />0.009 m <br /> (1.7 cm17 mm <br />0.017 m <br />) +
sessile +  and petiolate +
glabrous or +  and sparsely moderately hairy +
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 /> (10 cm100 mm <br />0.1 m <br />) +
Flowering (Apr–)May–Jul(–Oct). +
9 +  and 34 +
bearing subulate enations +, hairy +  and bristly +
ovoid;hemispheric;ovoid;hemispheric;globose;conic +
0.1 cm1 mm <br />0.001 m <br /> (0.17 cm1.7 mm <br />0.0017 m <br />) +
5 +  and 6 +
aristate +
0.06 cm0.6 mm <br />6.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
exalbuminous +
winged +  and branched +
1 (?) +  and 10 (?) +
appendaged +  and truncate +
hirsutulous +  and glabrous +
papillate +
Helenium nudiflorum +
Helenium flexuosum +
Helenium +
species +
urceolate +  and campanulate +
dilated +
toothed +  and entire +
30 cm300 mm <br />0.3 m <br /> (100 cm1,000 mm <br />1 m <br />) +
shrub +  and subshrub +