Flora of North America species comparison

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Helenium thurberi

Thurber's sneezeweed
Habit Annuals, 40–100 cm.
Stems

usually 1, branched distally, moderately winged, sparsely hairy proximally, moderately hairy distally.
Leaves

glabrous or sparsely hairy (basal leaves withered by flowering);

proximal blades lanceolate to lance-linear, usually irregularly laciniate;

mid and distal blades lance-linear, entire.
Peduncles

3–10 cm, moderately hairy.
Involucres

ovoid to conic, 6–10 × 5–10 mm.
Ray florets

0.
Disc florets

225–500+;

corollas yellow-green proximally, brown to reddish brown distally, 1–1.3 mm, lobes 4.
Phyllaries

(strongly connate proximally), moderately hairy.
Heads

10–75(–120+) per plant, in paniculiform arrays.
Cypselae

0.9–1.2(–1.5) mm, moderately hairy;

pappi of 6(–7) entire, non-aristate scales 0.2–0.5 mm.
2n

= 26.

Helenium thurberi
Phenology Flowering (Mar–)May–Jul(–Sep).
Habitat Ditches, around ponds, along streams, moist fields
Elevation 30–1600 m (100–5200 ft)
Distribution
from FNA
AZ; Mexico
[WildflowerSearch map]
[BONAP county map]
Source FNA vol. 21, p. 434.
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. puberulum, H. quadridentatum, H. vernale, H. virginicum
Name authority A. Gray: Proc. Amer. Acad. Arts 19: 32. (1883)
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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(If the plant you're looking for doesn't show up in the auto-complete list, that means it either isn't described in Flora of North America yet, or it's listed under a synonym. And please note that Flora of North America is still missing several plant families, including Fabaceae, Apiaceae, Boraginaceae, and Polemoniaceae.)

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