Helianthus strumosus L. - Pale-leaved Sunflower


 

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Helianthus strumosus - (image 1 of 4)

 

Taxonomy

Family: Asteraceae

Habitat

Woodlands. Frequent in oak woods that have not been fire-suppressed

Associates

In oak woodlands with Actaea pachypoda, Aster sagittifolius, Carex blanda, Carex hirtifolia, Carex jamesii, Carex oligocarpa, Carex pensylvanica, Caulophyllum thalictroides, Dodecatheon meadia, Eupatorium rugosum, Geranium maculatum, Helianthus hirsutus, Polemonium reptens, Scrophularia marilandica, Solidago ulmifolia, Trillium recurvatum, Uvularia grandifora.

Distribution

Most of the eastern half of the US.

Morphology

Herbaceous perennial. Leaves opposite, abruptly narrowed to a petiole less than 3cm long but more than 5mm long, the larger leaves more than 5cm wide, thick coarse, pale to whitish and usually densely pubescent beneath, subentire to shallowly dentate, the principle blades lanceolate to lance-ovate, more than 3 times longer than wide. Flowers head few to numerous, the disks typically more than 1.5cm across, yellow.

Notes

Flowers late July to early October

Wetland indicator: Upland

This species, H. hirsutus, and H. decapetalus represent a complex in this genus that is difficult to differentiate.

Bibliography

Swink, F. and G. Wilhelm. 1994. Plants of the Chicago Region.
Indiana Academy of Science. The Morton Arboretum. Lisle, Illinois.

 


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 Michael Hough 2005