Flora of North America species comparison

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Helenium microcephalum var. microcephalum
Photo is of parent taxon

smallhead sneezeweed
Habit Plants 30–120 cm.
Leaves

proximal and mid blades serrate to undulate-serrate, glabrous or sparsely hairy;

distal blades glabrous or sparsely hairy.
Peduncles

1–3.5 cm, projecting terminal heads barely beyond foliage.
Involucres

4–8 × 4–8 mm.
Ray florets

7–13;

corollas yellow, 2.6–4.8 × 1.6–3.9 mm.
Disc florets

120–300+;

corollas 1.2–1.6 mm, lobes (4–)5.
Heads

20–150(–300+) per plant.
Pappi

(0.2–)0.3–0.4(–0.5) mm.
2n

= 26.

Helenium microcephalum var. microcephalum
Phenology Flowering (Feb–)Jun–Jul(–Nov).
Habitat Sandy or clay soils, ditches, washes, around ponds and lakes, along streams
Elevation 0–1500 m (0–4900 ft)
Distribution
from FNA
AZ; NM; OK; TX; Mexico (Coahuila, Nuevo León, and Tamaulipas)
[BONAP county map]
Source FNA vol. 21, p. 434.
Parent taxa Asteraceae > tribe Heliantheae > subtribe Gaillardiinae > Helenium > Helenium microcephalum
Sibling taxa
H. microcephalum var. oöclinium
Name authority unknown
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 Apiaceae, Boraginaceae, and Polemoniaceae.)

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