The University of Arizona Cooperative Extension (reg)

  About the Journal



  This Issue:
    Last Minute Holiday
          Gift Ideas
    Computer Corner
    Arizona's Official
          Noxious Weed List
    Does Your Landscape
          Have A Drinking
    Irrigation Time Bombs
    Gambel's Quail
    Lettuce for the Cool
    Desert Milkweed,
          Fit for a Queen

2004 Valley Citrus Festivals

Master Gardener Journal  

S O U T H W E S T   R E P R I N T S

Arizona's Official Noxious Weed List

The following plants are prohibited from entry into Arizona unless accompanied by the appropriate federal and state permits. (Additional weed species are regulated by the federal government and may not be transported without specific permit).

Acroptilon repens (L.) DC.- Russian knapweed
Aegilops cylindrica Host.- Jointed goatgrass
Alhagi pseudalhagi (Bieb.) Desv.- Camelthorn
Alternanthera philoxeroides (Mart.) Griseb.- Alligator weed
Cardaria pubescens (C.A. Mey) Jarmolenko- Hairy whitetop
Cardaria chalepensis (L.) Hand-Muzz- Lens podded hoary cress
Cardaria draba (L.) Desv.- Globe-podded hoary cress (Whitetop)
Carduus acanthoides L.- Plumeless thistle
Cenchrus echinatus L.- Southern sandbur
Cenchrus incertus M.A. Curtis- Field sandbur
Centaurea calcitrapa L.- Purple starthistle
Centaurea iberica Trev. ex Spreng.- Iberian starthistle
Centaurea squarrosa Willd.- Squarrose knapweed
Centaurea sulphurea L.- Sicilian starthistle
Centaurea solstitialis L.- Yellow starthistle (St. Barnaby's thistle)
Centaurea diffusa L.- Diffuse knapweed
Centaurea maculosa L.- Spotted knapweed
Chondrilla juncea L.- Rush skeletonweed
Cirsium arvense L. Scop.- Canada thistle
Convolvulus arvensis L.- Field bindweed
Coronopus squamatus (Forskal) Ascherson- Creeping wartcress (Coronopus)
Cucumis melo L. var. Dudaim Naudin- Dudaim melon (Queen Anne's melon)
Cuscuta spp.- Dodder
Drymaria arenarioides H.B.K.- Alfombrilla (Lightningweed)
Eichhornia azurea (SW) Kunth.- Anchored waterhyacinth
Elytrigia repens (L.) Nevski- Quackgrass
Euphorbia esula L.- Leafy spurge
Halogeton glomeratus (M. Bieb.) C.A. Mey- Halogeton
Helianthus ciliaris DC.- Texas blueweed
Hydrilla verticillata Royale- Hydrilla (Florida-elodea)
Ipomoea spp.- Morning glory. All species except Ipomoea carnea, Mexican bush morning glory; Ipomoea triloba, three-lobed morning glory (which is considered a restricted pest); and Ipomoea aborescens, morning glory tree
Medicago polymorpha L.- Burclover
Nassella trichotoma((ees.) Hack.- Serrated tussock
Onopordum acanthium L.- Scotch thistle
Orobanche ramosa L.- Branched broomrape
Panicum repens L.- Torpedo grass
Peganum harmala L.- African rue (Syrian rue)
Portulaca oleracea L.- Common purslane
Rorippa austriaca (Crantz.) Bess.- Austrian fieldcress
Salvinia molesta- Giant salvina
Senecio jacobaea L.- Tansy ragwort Solanum carolinense L.- Carolina horsenettle
Sonchus arvensis L.- Perennial sowthistle
Solanum viarum Dunal- Tropical Soda Apple
Stipa brachychaeta Godr.- Puna grass
Striga spp.- Witchweed
Trapa natans L.- Water-chestnut
Tribulus terrestris L. - Puncturevine

From the Arizona Department of Agriculture website at

Photography: Courtesy UA/WM. B. McClaskey

Naming Names
by Kelly Young, Instructional Specialist, Maricopa County Extension

As seen in "Arizona's Noxious Weed List" on the left, when scientific or botanical names are written down, credit is traditionally given to the person who discovered the plant and "authored" its name.

If you look closely at the list, you'll notice that the letter L. follows several of the scientific names. This "L" stands Carolus Linnaeus, aka Carl Linne, the Swedish botanist who over 200 years ago named thousands of plants and developed the current system of classifying organisms.

Of a plant is renamed, as sometimes happens, the original author is given credit in parentheses out of respect, and the new author's name follows outside the parentheses.

Maricopa County Master Gardener Volunteer Information
Last Updated December 18, 2003, 2003
Author: Lucy K. Bradley, Extension Agent Urban Horticulture, University of Arizona Cooperative Extension, Maricopa County
© 1997 The University of Arizona, College of Agriculture and Life Sciences, Cooperative Extension in Maricopa County
Comments to 4341 E. Broadway Road, Phoenix, AZ 85040,
Voice: (602) 470-8086 ext. 301, Fax (602) 470-8092