The green links below add additional plants to the comparison table. Blue links lead to other Web sites.
enable glossary links
Helenium autumnale

common sneezeweed, fall sneezeweed, hélénie automnale, large-flower sneezeweed, mountain sneezeweed

rosilla, sneezeweed

Habit Perennials, 50–130 cm. Annuals or perennials, 50–160 cm.
Stems

1(–7), branched distally, strongly winged, sparsely to densely hairy proximally, moderately to densely hairy distally.

usually 1, branched distally, strongly winged, glabrous proximally, sparsely hairy distally.

Leaves

usually moderately to densely hairy, sometimes glabrous;

basal blades (withered by flowering) lanceolate, oblanceolate, or obovate, entire or weakly lobed;

proximal and mid blades obovate to oblanceolate, usually dentate or entire;

distal blades oblanceolate to lanceolate, entire or dentate.

glabrous or sparsely hairy;

basal blades oblanceolate to oblong-elliptic, entire;

proximal and mid blades lanceolate to oblong-elliptic, entire;

distal blades lance-linear, entire.

Peduncles

3–10 cm, moderately to densely hairy.

(6–)9–17(–23) cm, sparsely to moderately hairy.

Involucres

globoid, 8–20 × 8–23 mm.

globose to depressed globose, 9–15 × 9–17(–19) mm.

Ray florets

8–21, pistillate, fertile;

corollas yellow, 10–23 × 4–10 mm.

0, or 13–15, pistillate, fertile;

corollas yellow, 3.8–10 × 2–4 mm.

Disc florets

200–400(–800+);

corollas yellow proximally, yellow to yellow-brown distally, 2.4–4 mm, lobes 5.

300–500(–1000+);

corollas yellow proximally, yellow to reddish brown to purple distally, (1.6–)1.9–2.7 mm, lobes 4(–5).

Phyllaries

(connate proximally) moderately to densely hairy.

(distinct or connate proximally) moderately hairy.

Heads

5–70(–100+) per plant, in paniculiform arrays.

4–20(–30) per plant, in paniculiform arrays.

Cypselae

1–2 mm, sparsely to moderately hairy;

pappi of 5–7 entire, aristate scales (0.5–)0.9–1.5(–1.8) mm.

1.2–1.9 mm, moderately hairy;

pappi of 5–6 entire, aristate scales 0.4–1 mm.

2n

= 32, 34, 36.

= 58.

Helenium autumnale

Helenium puberulum

Phenology Flowering (Jul–)Aug–Oct(–Nov). Flowering (Mar–)Jun–Aug(–Nov).
Habitat Roadsides, fields, along streams, ditches, seepage areas, around ponds and lakes Along streams, ditches, seepage areas, around ponds and lakes, forests, woodlands
Elevation 20–2600 m (100–8500 ft) 0–1200 m (0–3900 ft)
Distribution
from FNA
AL; AR; AZ; CA; CO; DC; DE; FL; GA; IA; ID; IL; IN; KS; KY; LA; MA; MD; MI; MO; MS; MT; NC; ND; NE; NJ; NM; NV; NY; OH; OK; OR; PA; SC; TN; TX; UT; VA; WA; WV; WY; AB; BC; MB; NT; ON; QC; SK
[WildflowerSearch map]
[BONAP county map]
from FNA
CA; Mexico (Baja California)
[WildflowerSearch map]
[BONAP county map]
Discussion

Helenium puberulum may be of amphidiploid origin from hybridization between H. bigelovii (perennial, radiate, 2n = 32) and H. thurberi (annual, rayless, 2n = 26) (M. W. Bierner 1972).

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Source FNA vol. 21, p. 431. FNA vol. 21, p. 432.
Parent taxa Asteraceae > tribe Heliantheae > subtribe Gaillardiinae > Helenium Asteraceae > tribe Heliantheae > subtribe Gaillardiinae > Helenium
Sibling taxa
H. amarum, H. arizonicum, H. bigelovii, H. bolanderi, H. brevifolium, H. campestre, H. drummondii, H. elegans, H. flexuosum, H. linifolium, H. microcephalum, H. pinnatifidum, H. puberulum, H. quadridentatum, H. thurberi, H. vernale, H. virginicum
H. amarum, H. arizonicum, H. autumnale, H. bigelovii, H. bolanderi, H. brevifolium, H. campestre, H. drummondii, H. elegans, H. flexuosum, H. linifolium, H. microcephalum, H. pinnatifidum, H. quadridentatum, H. thurberi, H. vernale, H. virginicum
Synonyms H. autumnale var. canaliculatum, H. autumnale var. fylesii, H. autumnale var. grandiflorum, H. autumnale var. montanum, H. autumnale var. parviflorum, H. latifolium, H. parviflorum
Name authority Linnaeus: Sp. Pl. 2: 886. (1753) de Candolle: in A. P. de Candolle and A. L. P. P. de Candolle, Prodr. 5: 667. (1836)
Web links