This plant is listed by the U.S. federal government or a state. Common names are from state and federal lists. Click on a place name to get a complete noxious weed list for that location, or click here for a composite list of all
Federal and State Noxious Weeds
This plant and the related entity italicized and indented above can be weedy or invasive according to the authoritative sources noted below.This plant may be known by one or more common names in different places, and some are listed above. Click on an acronym to view each weed list, or click here for a composite list of
Weeds of the U.S.
5-50 cm, papillose to hispid or, occasionally, glabrous.
erect to ascending, branched from base; branches arcuate or, occasionally, almost prostrate.
alternate; blade linear, mostly 1-2 mm wide in herbarium specimens, fleshy, usually not swollen at base, apex ± acuminate into rather firm, 1-1.5(-2.2) mm spine.
interrupted at maturity, usually 1-flower per axil of bract; bracts alternate, not imbricate at maturity, reflexed, not distinctly swollen at base, apex narrowing into subulate spine.
bracteoles free or becoming connate and adnate to perianth base; perianth segments with comparatively narrow wing or in lower flowers occasionally wingless (in
sometimes prominently winged), with weak or firm, acute apex, glabrous; fruiting perianth 4-6(-8) mm diam.
Subspecies ca. 2 (2 in the flora): introduced; coastal areas of Europe, n Africa, sw Asia; introduced and naturalized in other coastal regions.
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