{"data":{"id":"us/7-cfr-361.6","jurisdiction":"us","citation":"7 CFR 361.6","heading":"Noxious weed seeds.","body":"(a) Seeds of the plants listed in paragraphs (a)(1) and (a)(2) of this section shall be considered noxious weed seeds.\n(1) Seeds with no tolerances applicable to their introduction:\nAcacia nilotica (Linnaeus) Wildenow ex Delile\nAeginetia spp.\nAgeratina adenophora (Sprengel) King \u0026 Robinson\nAgeratina riparia (Regel) R.M. King and H. Robinson\nAlectra spp.\nAlternanthera sessilis (L.) R. Brown ex de Candolle\nArctotheca calendula (Linnaeus) Levyns\nAsphodelus fistulosus L.\nAvena sterilis L. (including Avena ludoviciana Durieu)\nAzolla pinnata R. Brown\nCarthamus oxyacantha M. Bieberstein\nChrysopogon aciculatus (Retzius) Trinius\nCommelina benghalensis L.\nCrupina vulgaris Cassini\nCuscuta spp.\nDigitaria abyssinica (Hochstetter ex A. Richard) Stapf\nDigitaria velutina (Forsskal) Palisot de Beauvois\nDrymaria arenariodes Humboldt \u0026 Bonpland ex J.A. Schultes\nEichhornia azurea (Swartz) Kunth\nEmex australis Steinheil\nEmex spinosa (L.) Campdera\nEuphorbia terracina Linnaeus\nGalega officinalis L.\nHeracleum mantegazzianum Sommier \u0026 Levier\nHydrilla verticillata (Linnaeus f.) Royle\nHygrophila polysperma T. Anderson\nImperata brasiliensis Trinius\nImperata cylindrica (Linnaeus) Palisot de Beauvois\nInula britannica Linnaeus\nIpomoea aquatica Forsskal\nIschaemum rugosum Salisbury\nLagarosiphon major (Ridley) Moss\nLeptochloa chinensis (L.) Nees\nLimnophila sessiliflora (Vahl) Blume\nLycium ferocissimum Miers\nLygodium flexuosum (Linnaeus) Swartz (maidenhair creeper)\nLygodium microphyllum (Cavanilles) R. Brown (Old World climbing fern)\nMelaleuca quinquenervia (Cav.) Blake\nMelastoma malabathricum L.\nMikania cordata (Burman f.) B. L. Robinson\nMikania micrantha Kunth\nMimosa diplotricha C. Wright\nMimosa pigra L. var. pigra\nMonochoria hastata (L.) Solms-Laubach\nMonochoria vaginalis (Burman f.) C. Presl\nMoraea collina Thunberg\nMoraea flaccida (Sweet) Steudel\nMoraea miniata Andrews\nMoraea ochroleuca (Salisbury) Drapiez\nMoraea pallida (Baker) Goldblatt\nNassella trichotoma (Nees) Hackel ex Arechavaleta\nOnopordum acaulon Linnaeus\nOnopordum illyricum Linnaeus\nOpuntia aurantiaca Lindley\nOrobanche spp.\nOryza longistaminata A. Chevalier \u0026 Roehrich\nOryza punctata Kotschy ex Steudel\nOryza rufipogon Griffith\nOttelia alismoides (L.) Pers.\nPaspalum scrobiculatum L.\nPennisetum clandestinum Hochstetter ex Chiovenda\nPennisetum macrourum Trinius\nPennisetum pedicellatum Trinius\nPennisetum polystachion (L.) Schultes\nProsopis alapataco R. A. Philippi\nProsopis argentina Burkart\nProsopis articulata S. Watson\nProsopis burkartii Munoz\nProsopis caldenia Burkart\nProsopis calingastana Burkart\nProsopis campestris Grisebach\nProsopis castellanosii Burkart\nProsopis denudans Bentham\nProsopis elata (Burkart) Burkart\nProsopis farcta (Banks \u0026 Solander) J.F. Macbride\nProsopis ferox Grisebach\nProsopis fiebrigii Harms\nProsopis hassleri Harms\nProsopis humilis Gillies ex Hooker \u0026 Arnott\nProsopis kuntzei Harms\nProsopis pallida (Humboldt \u0026 Bonpland ex Willdenow) Kunth\nProsopis palmeri S. Watson\nProsopis reptans Bentham var. reptans\nProsopis rojasiana Burkart\nProsopis ruizlealii Burkart\nProsopis ruscifolia Grisebach\nProsopis sericantha Gillies ex Hooker \u0026 Arnott\nProsopis strombulifera (Lamarck) Bentham\nProsopis torquata (Cavanilles ex Lagasca y Segura) de Candolle\nRottboellia cochinchinensis (Lour.) W. Clayon\nRubus fruticosus L. (complex)\nRubus moluccanus L.\nSaccharum spontaneum L.\nSagittaria sagittifolia L.\nSalsola vermiculata L.\nSalvinia auriculata Aublet\nSalvinia biloba Raddi\nSalvinia herzogii de la Sota\nSalvinia molesta D.S. Mitchell\nSenecio inaequidens DC.\nSenecio madagascariensis Poir.\nSetaria pumila (Poir.) Roem. \u0026 Schult. subsp. pallidefusca (Schumach.) B.K. Simon\nSolanum tampicense Dunal (wetland nightshade)\nSolanum torvum Swartz\nSolanum viarum Dunal\nSparganium erectum L.\nSpermacoce alata Aublet\nStriga spp.\nTridax procumbens L.\nUrochloa panicoides Beauvois\n(2) Seeds with tolerances applicable to their introduction:\nAcroptilon repens (L.) DC. (=Centaurea repens L.) (=Centaurea picris)\nCardaria draba (L.) Desv.\nCardaria pubescens (C. A. Mey.) Jarmol.\nConvolvulus arvensis L.\nCirsium arvense (L.) Scop.\nElytrigia repens (L.) Desv. (=Agropyron repens (L.) Beauv.)\nEuphorbia esula L.\nSonchus arvensis L.\nSorghum halepense (L.) Pers.\n(b) The tolerance applicable to the prohibition of the noxious weed seeds listed in paragraph (a)(2) of this section shall be two seeds in the minimum amount required to be examined as shown in column 1 of table 1 of § 361.5. If fewer than two seeds are found in an initial examination, the shipment from which the sample was drawn may be entered. If two seeds are found in an initial examination, a second sample must be examined. If two or fewer seeds are found in the second examination, the shipment from which the samples were drawn may be entered. If three or more seeds are found in the second examination, the shipment from which the samples were drawn may not be entered. If three or more seeds are found in an initial examination, the shipment from which the sample was drawn may not be entered.\n(c) Any seed of any noxious weed that can be determined by visual inspection (including the use of transmitted light or dissection) to be within one of the following categories shall be considered inert matter and not counted as a weed seed:\n(1) Damaged seed (other than grasses) with over one half of the embryo missing;\n(2) Grass florets and caryopses classed as inert:\n(i) Glumes and empty florets of weedy grasses;\n(ii) Damaged caryopses, including free caryopses, with over one-half the root-shoot axis missing (the scutellum excluded);\n(iii) Immature free caryopses devoid of embryo or endosperm;\n(iv) Free caryopses of quackgrass (Elytrigia repens) that are 2 mm or less in length; or\n(v) Immature florets of quackgrass (Elytrigia repens) in which the caryopses are less than one-third the length of the palea. The caryopsis is measured from the base of the rachilla.\n(3) Seeds of legumes (Fabaceae) with the seed coats entirely removed.\n(4) Immature seed units, devoid of both embryo and endosperm, such as occur in (but not limited to) the following plant families: buckwheat (Polygonaceae), morning glory (Convolvulaceae), nightshade (Solanaceae), and sunflower (Asteraceae).\n(5) Dodder (Cuscuta spp.) seeds devoid of embryos and seeds that are ashy gray to creamy white in color are inert matter. Dodder seeds should be sectioned when necessary to determine if an embryo is present, as when the seeds have a normal color but are slightly swollen, dimpled, or have minute holes.","path":["Title 7—Agriculture","Subtitle B—Regulations of the Department of Agriculture","CHAPTER III—ANIMAL AND PLANT HEALTH INSPECTION SERVICE, DEPARTMENT OF AGRICULTURE","PART 361—IMPORTATION OF SEED AND SCREENINGS UNDER THE FEDERAL SEED ACT"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-7.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:24:01Z","sha256":"2cd7d529280852cb5403823a13c48de38b2a68ec901b32a31a20881c9842928a","source_id":"us-cfr","stale":true,"prev":"us/7-cfr-361.5","next":"us/7-cfr-361.7"},"notice":"GroundRules: Original legal text. Not legal advice."}