Vascular Plants of North Carolina
Account for Paleleaf Sunflower - Helianthus strumosus   L.
Members of Asteraceae:
Members of Helianthus with account distribution info or public map:
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Section 6 » Order Asterales » Family Asteraceae
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AuthorL.
DistributionMountains and most of the Piedmont; scarce in the southeastern Piedmont, and disjunct to two counties on the outer Coastal Plain.

ME and Que. to ND, south to northern FL and TX.
AbundanceFrequent to locally common in the Mountains and western Piedmont; fairly common in most of the central and northern Piedmont, but rare to very rare in the southeastern portions. Very rare in the lower Coastal Plain.
HabitatMesic to dry, open woodlands, openings and edges of woodlands, overgrown fields, roadsides, powerline clearings.
PhenologyFlowering and fruiting late July-September.
IdentificationPaleleaf Sunflower is a robust species often growing to 5-6 feet tall; it has a smooth stem (except perhaps in the inflorescence), which is also glaucescent. Leaves are opposite (the uppermost may be alternate), thick, very rough above, glaucescent or glaucous or short-hairy beneath, and lanceolate or narrowly ovate in shape. The apparently non-native H. tuberosus is similarly robust with large leaves, but its stem is rough-pubescent, at least near the base. H. laevigatus is similar but its leaves are smooth above, with a "rubbery" texture. This is a rather "standard" sunflower, looking like many species and growing in typical sunflower habitats; however, it is a large species with quite large flowers, often 3 inches across.
Taxonomic CommentsNone

Other Common Name(s)Roughleaf Sunflower, Paleleaf Woodland Sunflower
State RankS4 [S5]
Global RankG5
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