Flora of North America species comparison

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Helenium puberulum

rosilla, sneezeweed
Habit Annuals or perennials, 50–160 cm.
Stems

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

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

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

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

0, or 13–15, pistillate, fertile;

corollas yellow, 3.8–10 × 2–4 mm.
Disc florets

300–500(–1000+);

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

(distinct or connate proximally) moderately hairy.
Heads

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

1.2–1.9 mm, moderately hairy;

pappi of 5–6 entire, aristate scales 0.4–1 mm.
2n

= 58.

Helenium puberulum
Phenology Flowering (Mar–)Jun–Aug(–Nov).
Habitat Along streams, ditches, seepage areas, around ponds and lakes, forests, woodlands
Elevation 0–1200 m (0–3900 ft)
Distribution
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. 432.
Parent taxa Asteraceae > tribe Heliantheae > subtribe Gaillardiinae > Helenium
Sibling taxa
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
Name authority de Candolle: in A. P. de Candolle and A. L. P. P. de Candolle, Prodr. 5: 667. (1836)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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