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threadleaf woollywhite, white ragweed
Asteraceae - Aster
Leonora Curtin Wetland Preserve, Museum Hill
DescriptionThis perennial is a native of western North America. The stems and leaves are densely coated with short, matted, woolly, white hairs. Under the coat of white wool are dark green stems. The leaves are alternate, threadlike and clustered at the base. The leaves resemble fern. This plant is usually found growing in rocky or sandy areas.
Mature SizeUp to 16 inches
Flower ColorYellow, White
BloomIn late spring and summer, yellow or sometimes white, disk flowers appear. There are no ray flowers. The flower heads are in open clusters. Parchment-like bracts surround these flower heads. The stigmas protrude noticeably from the tips of the corollas.
Interesting FactsThere are many species of Hymenopappus. H. filifolius is easily confused with the other species. In Latin, the word filifolius means with thread-like leaves. It is called White ragweed because of its white hairs and the tattered appearance of the leaves.
Traditional and Medicinal UsesThe Zuni people chewed the roots of Hymenopappus filifolius like chewing gum.
Santa Fe Botanical Garden SitesLeonora Curtin Wetland Preserve, Museum Hill