Heterotheca grandiflora is a species of flowering plant in the daisy family known by the common name silk-grass goldenaster or telegraphweed. It is native to the southwestern United States (California, Nevada, Utah, Arizona) and northwestern Mexico (Baja California), but it can be found in other areas as an introduced species, such as Hawaii. It is often a roadside weed even where it is native.
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Heterotheca grandiflora is a tall, bristly, glandular plant exceeding a meter (40 inches) in height and densely foliated in hairy to spiny toothed or lobed leaves. Leaves are smaller and more widely spaced toward the top of the stem, which is occupied by an inflorescence of bright yellow daisy-like flower heads. The disc and ray florets drop away to leave a spherical head of achenes, each with a long white pappus.
- The Plant List, Heterotheca grandiflora Nutt
- "Biota of north America Program 2014 county distribution map".
- Calflora taxon report, University of California, Heterotheca grandiflora Nutt.. telegraph weed, telegraphweed
- SEINet, Southwestern Biodiversity, Arizona chapter photos, description, distribution map
- "Heterotheca grandiflora in Flora of North America @ efloras.org". www.efloras.org.
- Jepson Manual Treatment
- United States Department of Agriculture Plants Profile
- Calphotos Photo gallery, University of California