Flora of North America species comparison

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Helenium quadridentatum

longdisk sneezeweed
Habit Annuals, 30–100 cm.
Stems

usually 1, branched distally, moderately to strongly winged, glabrous or sparsely hairy.
Leaves

glabrous or sparsely hairy;

blades narrowly elliptic to lance-linear, usually entire;

proximal blades sometimes pinnately lobed.
Peduncles

3–13 cm, sparsely to moderately hairy.
Involucres

ovoid to conic, 7–11(–14) × 6–11 mm.
Ray florets

10–15, pistillate, fertile;

corollas yellow, 7–12.4 × 4–8.8 mm.
Disc florets

225–500+;

corollas yellow proximally, yellow to brown to reddish brown distally, 1.1–1.8 mm, lobes 4.
Phyllaries

(connate proximally) sparsely to densely hairy.
Heads

5–15(–50+) per plant, in paniculiform arrays.
Cypselae

0.6–1.2 mm, moderately hairy;

pappi of usually 6 entire, non-aristate scales 0.1–0.3 mm.
2n

= 26.

Helenium quadridentatum
Phenology Flowering Mar–Jun (year round).
Habitat Sandy or clay soils, ditches, around ponds and lakes, along streams
Elevation 0–1800 m (0–5900 ft)
Distribution
from FNA
AL; LA; MS; PA; TX; Mexico; West Indies (Cuba); Central America (Belize, Guatemala)
[BONAP county map]
Discussion

Helenium quadridentatum is introduced in Pennsylvania.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
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. thurberi, H. vernale, H. virginicum
Name authority Labillardière: Actes Soc. Hist. Nat. Paris 1: 22, plate 4. (1792)
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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