Flora of North America species comparison

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Helenium microcephalum var. oöclinium
Photo is of parent taxon
Habit Plants 25–80 cm.
Leaves

proximal and mid blades serrate to undulate-serrate to occasionally deeply toothed or laciniate, glabrate;

distal blades glabrous or sparsely to moderately hairy.
Peduncles

1.5–8 cm, usually projecting terminal heads well beyond foliage.
Involucres

8–12 × 8–12 mm.
Ray florets

9–13;

corollas usually yellow throughout, sometimes reddish proximally and yellow distally, 2.7–9.1 × 1.5–6.7 mm.
Disc florets

200–400+;

corollas 1.7–2.4 mm, lobes 5.
Heads

20–100+ per plant.
Pappi

0.4–0.7 mm.
2n

= 26.

Helenium microcephalum var. oöclinium
Phenology Flowering (Mar–)Apr–Jun(–Dec).
Habitat Sandy or clay soils, ditches, washes, around ponds and lakes, along streams
Elevation 500–1900 m (1600–6200 ft)
Distribution
from FNA
TX; Mexico (Coahuila, Nuevo León, Durango, San Luis Potosí)
Source FNA vol. 21, p. 434.
Parent taxa Asteraceae > tribe Heliantheae > subtribe Gaillardiinae > Helenium > Helenium microcephalum
Sibling taxa
H. microcephalum var. microcephalum
Synonyms H. oöclinium
Name authority (A. Gray) Bierner: Sida 5: 47. (1972)
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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