Status: Native
Synonyms:
By var., see Allred
Helianthus petiolaris is similar to Helianthus annuus, but the phyllaries are
lanceolate and not ovate. To use the key in Martin & Hutchins, one has to consider the phyllaries to be "hispidulous" but not ciliate. There certainly are short, bristly hairs on the margin. The hairs are conspicuously shorter than those of Helianthus annuus. Helianthus petiolaris is
much branched from near the base and spindly in comparision. Both are annuals. Helianthus
petiolaris prefers sandy plains at lower elevation. The seeds are hairy, lighter toward the margin and darker toward the center. They have a notch on the broad end. The achenes of Helianthus annuus are glabrate in comparision.
Please click on an image for a larger file.
Helianthus petiolaris, photo Russ Kleinman & Karen Blisard, Burro Mtns., Saddlerock Road, Aug. 15, 2007
Helianthus petiolaris, growth habit, photo Russ Kleinman & Karen Blisard, Burro Mtns., Saddlerock Road, Aug. 15, 2007
Helianthus petiolaris, villous achenes, photo Russ Kleinman, Burro Mtns., Blackhawk Canyon, Jan. 6, 2009
Helianthus petiolaris, closeup of lanceolate phyllaries, photo Russ Kleinman, Burro Mtns., Mangas Springs, July 1, 2009
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