THE WATCH LIST Watch List_0.pdf• Pale green stems hairy, rigid, upper portion branched • Plants...
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Asian Mustard (Brassica tournefortii) • 18-36 in. tall; basal rosette up to 36 in. wide • Plants set seed prior to April •Seed pods up to 2 in. long • Basal rosette leaves hairy; pinnately lobed & with toothed margins •Seeds light reddish brown or black Flowering rush (Butomus umbellatus) •Up to 5 ft. tall • Aquatic perennial • Blooms late summer •Flowers 1 in. wide • Leaves basal, sword-like & up to 3 ft. tall by in. wide • Thick, creaping rhizomes • Stems triangular • Fruits brown, in. long •Tolerant to a wide temperature range Common reed (Phragmites australis) • 6-15 ft. tall perennial grass • Spreads by rhizomes •Forms dense thickets in or near water •Blooms July to October • Flowers feathery & drooping; can appear silvery or purplish • Leaves blue-green, flat, smooth • Native species of Phragmites also exist in Colorado Cogongrass (Imperata cylindrica) •Up to 6 ft. tall • Colony-forming •Flowers 2-8 in.; fuzzy • Leaves to in. wide with off-center whitish midrib, finely serrated margins & a sharp, pointed apex • Rhizomes whitish, scaly & sharp Himalayan blackberry (Rubus armeniacus) •Up to 15 ft. tall • Thicket-forming shrub •Blooms late spring to summer •Flowers 1 in. in groups of 3-20 • Compound leaves dark green above & pale to whitish below; leaves on 1st year shoots have 5 leaflets & leaves on 2nd year side shoots have 3 leaflets Common bugloss (Anchusa officinalis) •1-2 ft. tall by 1-2 ft. wide •Blooms June to October • Flowers in. bright blue to purple with white throats •Stems & leaves fleshy & hairy • Leaves narrow & slightly pointed; alternate & get smaller up stem • Fruit 4-chambered nutlet, 1 seed each Meadow hawkweed (Hieracium caespitosum) •1-3 ft. tall •Blooms late May to June; flower heads in tight clusters; 5-30 heads per stem • Leaves mostly basal; lance shaped, up to 6 in. long & hairy; form dense mat at base •Stems, leaves & bracts have dense blackish hairs & exude milky sap when broken Onionweed (Asphodelus fistulosus) • 1-2 ft. tall tufted clumps • Blooms July through August • Flowers to in. wide • Stems branched & hollow •Leaves 3-14 in. long by in. wide •Doesn’t smell like onion & doesn’t form bulb • Seeds triangular in cross- section; sharp edges Baby’s breath (Gypsophila paniculata) •12-18 in. tall & up to 16 in. wide • Blooms summer through fall • Flowers clustered, delicate, white or pink, 5-parted • Leaves linear-lance-shaped, hairy, opposite; to 4 in. long • Seed capsules egg-shaped, less than 1/10 in., very small & blackish Garlic mustard (Alliaria petiolata) •1-4 ft. tall • Herbaceous biennial • Blooms early spring • Flowers small; 4 white petals •Rosette leaves 1-6 in. & heart-shaped •Mature seeds shiny black in erect, slender green pods that turn pale brown •Garlic odor when plant parts crushed • Highly shade-tolerant Report Sitings To: [email protected] I More Info: www.colorado.gov/ag/weeds I Photo Credits to www.invasive.org THE WATCH LIST Colorado Noxious Weed Management Program Hairy willow-herb (Epilobium hirsutum) • 3-6 ft. tall; perennial • Blooms June to August •Flowers single, 1/2 to 1 in. •Stems covered in soft hairs •Seeds with white silky tuft in long seedpod • Leaves in. wide, 2-4 in. long, opposite, lance-shaped with toothed edges; attached directly to stem • Numerous native species are found in CO wetlands Brazillian Elodea (Egeria densa) •Up to 6 ft. long; dense submerged aquatic perennial •Can live rooted or free floating; up to 20’ deep • Flowers emergent on stalks with 3 white petals & 3 green sepals • Bright green leaves in whorls of 4; linear, oblong, 1¼” w/ very finely toothed margins • Fragmented pieces can produce new plants
Transcript of THE WATCH LIST Watch List_0.pdf• Pale green stems hairy, rigid, upper portion branched • Plants...
Asian Mustard(Brassica tournefortii)
•18-36in.tall;basalrosetteupto36in.wide•PlantssetseedpriortoApril•Seedpodsupto21/2in.long•Basalrosetteleaveshairy;pinnatelylobed&withtoothedmargins•Seedslightreddishbrownorblack
Flowering rush(Butomus umbellatus)
•Upto5ft.tall•Aquaticperennial•Bloomslatesummer•Flowers1in.wide•Leavesbasal,sword-like&upto3ft.tallby1/2in.wide•Thick,creapingrhizomes•Stemstriangular•Fruitsbrown,1/2in.long•Toleranttoawidetemperaturerange
Common reed (Phragmites australis)
•6-15ft.tallperennialgrass•Spreadsbyrhizomes•Formsdensethicketsinornearwater•BloomsJulytoOctober•Flowersfeathery&drooping;canappearsilveryorpurplish•Leavesblue-green,flat,smooth•NativespeciesofPhragmitesalsoexistinColorado
Cogongrass(Imperata cylindrica)
•Upto6ft.tall•Colony-forming•Flowers2-8in.;fuzzy•Leaves1/2to3/4in.widewithoff-centerwhitishmidrib,finelyserratedmargins&asharp,pointedapex•Rhizomeswhitish,scaly&sharp
Himalayan blackberry(Rubus armeniacus)
•Upto15ft.tall•Thicket-formingshrub•Bloomslatespringtosummer•Flowers1in.ingroupsof3-20•Compoundleavesdarkgreenabove&paletowhitishbelow;leaveson1styearshootshave5leaflets&leaveson2ndyearsideshootshave3leaflets
Common bugloss(Anchusa officinalis)
•1-2ft.tallby1-2ft.wide•BloomsJunetoOctober•Flowers1/2in.brightbluetopurplewithwhitethroats•Stems&leavesfleshy&hairy•Leavesnarrow&slightlypointed;alternate&getsmallerupstem•Fruit4-chamberednutlet,1seedeach
Meadow hawkweed(Hieracium caespitosum)
•1-3ft.tall•BloomslateMaytoJune;flowerheadsintightclusters;5-30headsperstem•Leavesmostlybasal;lanceshaped,upto6in.long&hairy;formdensematatbase•Stems,leaves&bractshavedenseblackishhairs&exudemilkysapwhenbroken
Onionweed(Asphodelus fistulosus)
•11/2-21/2ft.talltuftedclumps•BloomsJulythroughAugust•Flowers1/4to1/2in.wide•Stemsbranched&hollow•Leaves3-14in.longby1/4in.wide•Doesn’tsmelllikeonion&doesn’tformbulb•Seedstriangularincross-section;sharpedges
Baby’s breath (Gypsophila paniculata)
•12-18in.tall&upto16in.wide•Bloomssummerthroughfall•Flowersclustered,delicate,whiteorpink,5-parted•Leaveslinear-lance-shaped,hairy,opposite;3/4to4in.long•Seedcapsulesegg-shaped,lessthan1/10in.,verysmall&blackish
Garlic mustard(Alliaria petiolata)
•1-4ft.tall•Herbaceousbiennial•Bloomsearlyspring•Flowerssmall;4whitepetals•Rosetteleaves1-6in.&heart-shaped•Matureseedsshinyblackinerect,slendergreenpodsthatturnpalebrown•Garlicodorwhenplantpartscrushed•Highlyshade-tolerantR
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Hairy willow-herb(Epilobium hirsutum)
•3-6ft.tall;perennial•BloomsJunetoAugust•Flowerssingle,1/2to1in.•Stemscoveredinsofthairs•Seedswithwhitesilkytuftinlongseedpod•Leaves1/2in.wide,2-4in.long,opposite,lance-shapedwithtoothededges;attacheddirectlytostem•NumerousnativespeciesarefoundinCOwetlands
Brazillian Elodea(Egeria densa)
•Upto6ft.long;densesubmergedaquaticperennial•Canliverootedorfreefloating;upto20’deep•Flowersemergentonstalkswith3whitepetals&3greensepals•Brightgreenleavesinwhorlsof4;linear,oblong,1¼”w/veryfinelytoothedmargins•Fragmentedpiecescanproducenewplants
Purple pampasgrass(Cortaderia jubata)
•1-2ft.tallby1-2ft.wide•BloomsJunetoOctober•Flowers1/2in.brightbluetopurplewithwhitethroats•Stems&leavesfleshy&hairy•Leavesnarrow&slightlypointed;alternate&getsmallerupstem•Fruitsare4-chamberednutletswith1seedeach
Scotch broom(Cytisus scoparius)
•7ft.tallby31/2ft.wide•Bloomslatespringtoearlysummer•Flowers1in.&pea-like•Trifoliateleavesdarkgreenabove;paler&fuzzybelow;alternate&pinatelycompound;1/2-1in.wide•Groovedstemsupto2in.wide•Flatseedpodswithsmallblackseeds
Sericea lespedeza(Lespedeza cuneata)
•3to6ft.tall•Bloomssummertofall•Flowersinclustersof2-4•Leavesthin,alternate,abundant&three-parted;leaflets1/2-1in.withwedge-shapedbases;hairy•Onetomanyslenderstems
Spiny cocklebur(Xanthium spinosum)
•1-4ft.tallby1-4ft.wide•BloomsJunetoJuly•Flowers1-11/2in.;creamygreen•Stemstraight&ridgid•Leavesalternate,upto3in.long&11/2in.wide;3-lobed;shiny•Femaleflowersbecomeburrswhicharethefruits;egg-shaped
Woolly distaff thistle(Carthamus lanatus)
•31/2ft.tall•BloomsJulytoAugust•Flowers1-2in.widewithspinybracts•Palegreenstemshairy,rigid,upperportionbranched•Plantspersistuprightaftertheyhavedied•Flowerssimilartoyellowstarthistle
Yellow flag iris(Iris pseudacorus)
•3-4ft.tallwetlandperennial•Bloomslatespringtoearlysummer•Flowersbrightyellowwith3droopingsepals&3smaller,uprightpetals,3in.wide&ingroupsof2-10•Leavesarisefrombase,flatwithraisedmid-rib;rhisomesgrowupto20ft.•Fruitsoccuras2in.browncapsules
Yellowtuft(Alyssum murale & A. corsicum)
•Perennialforbs•Adaptedtoserpentinesoils•Flowersareyellow,small&plentiful,occurringonbranchedumbels•Bloomearlysummer•Fruitsarepapery,circulartoovalandflattened
• A.muralehasnarrow,gray-greenleaves&A.corsicumhasovalsilvery-grayleaves
Water lettuce(Pistia stratiotes)
•2-3ft.tall;densefloatingaquatic•Bloomslatesummertowinter•Flowersinconspicuous;clusteredonsmall,fleshystalkinleafaxils•Leavesvelvety,hairy,spongy&inrosettes;6in.long;connectedbyshortstolons•Rootsnumerous&feathery
White bryony(Bryonia alba)
•12ft.longormore;vigorousvine;cangrow6in.perday•Bloomsmid-summer•Flower1/2in.wide&greenish-white•Leavesaredarkgreenandpalmatelylobed;eachhasacorkscrewtendrilforclimbing•Highlytoxicseedsinround,blackfruit•Formsdensemats&shadesoutvegetation
Parrotfeather(Myriophyllum aquaticum)
•Denseaquaticperennialwithbothsubmerged&emergentleaves•Emergedleavesbrightblue-green;submergeddarker;4-6whorledateachnode•Emergedstemsgrowupto1ft.abovewater•Flowersmayoccur;ifso,white&1/16in.long•Spreadsbyplantfragments
Water hyacinth(Eichhornia crassipes)
•Upto3ft.tall;densefloatingaquatic•Formsdensethicketsinwater•BloomsJulytoOctober•Flowers2in.wideinclustersattheendofa12-in.spike•Leavesdarkgreen,11/2to41/2in.wide&6in.long•Featheryroots
Yellow floatingheart(Nymphoides peltata)
•Floatingaquaticperennial•Carpetswatersurfacewithlong-stalked,heart-shaped,opposite&unequalleaves;2-6”long&wide;arisingfromrhizomes•Flowersbrightyellow;2-5perstalk;1”indiameter;5petalswithfringededges•FlowersJunetoSeptember•Seedsflat&ovalinshape;containedinbeakedcapsule
Swainsonpea(Sphaerophysa salsula)
•Upto5ft.tall•BloomsMaytoJune•Flowers1/4-1in.long,pea-shaped,&ingroupsof4-8•Leavescompoundpinnate,alternate;9-25ovalleafletswithsilveryhairs•Seedsformininflatedbladder-likepods•Woodytaprootwithspreadingrhizomes
Syrian beancaper(Zygophyllum fabago)
•Upto3ft.tallby3ft.wide•BloomsMaytoAugust•Flowerscanbewhite,yelloworsalmoncolor&have10-12orangestamens•Stemssucculent&multi-branched•Leavesopposite,compound&with2thick,fleshyleaflets
*PhotoscourtesyOregonDept.ofAgriculture
