Gutierrezia genus --- aster subfamily 3.2
Aster 3.1 (Genus A to F) -- Aster 3.2 (Genus G to O) -- Aster 3.3 (Genus P to R) -- Aster 3.4 (Genus S to Z)
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threadleaf snakeweed (Gutierrezia microcephala) -- in September -- White Sands National Monument, NM NM-S
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broom snakeweed (Gutierrezia sarothrae) -- in August -- Orchard Cove Trail, Lory State Park, CO CO-LSP
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broom snakeweed (Gutierrezia sarothrae) -- in August -- Soapstone Prairie, Fort Collins Natural Area, CO