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New Invasive Plants to Watch For –And What to do When You Find ThemEllen JacquartInvasive Plant Advisory Committee Chair
Watch for These NewInvasive Plants:And When You Find Them:1.2.3.4.5.6.7.8.9.10.Japanese stiltgrassPlumeless thistleBlack swallow-wortPale swallow-wortCallery pearBurning bushAmur cork treeSweet autumn clematisJapanese chaff flowerMile-a-minute vine
Japanese Stilt GrassMicrostegium vimineum
Casey Jones of ACRES showing Japanesestiltgrass to Allen County Highways foreman
Spiny plumeless thistleCarduus acanthoides Magenta-flowered biennial thistleinvasive in open areasRelated to nodding thistle, Carduusnutans – same color flower, butflowers upright, smaller, andnumerous on plant.
Spiny plumeless thistleCarduus acanthoides First found by Scott Namestnik nearHamilton several years agoMapping in effort in 2015 found 36sitesLandowner contact effort starting thisyear
Spiny plumeless thistleCarduus acanthoides Highly branched, with one flowerat the end of each branchEach flower up to 1” in diameterLooks like bull thistle, but: Even spinier than bull thistle Leaves paler Flowers 2 weeks earlier (early July,versus bull thistle blooming in lateJuly)
Black Swallow-wortPale Swallow-wortVincetoxicum nigrumVincetoxicum rossicumLeaves dark green, flowers darkpurple, peduncles 2 cmLeaves medium green, flowerspink to reddish, peduncles 2cm
Black and Pale Swallow-wortNative Look-alikeBlack swallow-wortCynanchum laeve , Honey vineNote its heart-shaped leaf baseand white flowers
Callery PearPyrus calleryana
Callery PearPyrus calleryanaMartin County - Callery pear hasinvaded approximately 80% of a62,473 acre reserve
Burning bushEuonymus alatus Extremely popular landscaping shrubwhich is invading forests throughoutIndianaGreen, more or less winged twigs withfinely-toothed opposite leaves, turningbright red in fall
Burning bushEuonymus alatus
Amur cork treePhellodendron amurense Tree used in landscaping decades ago,now popping up in a few places aroundthe statePinnately compound leaves, oppositearrangement, with acute tips – smelllike turpentine when crushedFuits are drupesCorky bark
Amur cork treePhellodendron amurense Scattered locations; unsure howprevalent this species is.
Sweet autumn clematisClematis terniflora Invasive vine in open habitats, climbingover other vegetation
Sweet autumn clematisClematis terniflora Scattered in Indiana, unclear howwidespread it isHas a native look-a-like, Clematisvirginiana, which has toothed leavesNativeInvasive
Japanese chaff flowerAchyranthes japonica A relatively new invader in IndianaThe leaves are opposite, simple, and entirealong the margins.The flowers occur on erect spikes at theend of the stems and upper branches.
Japanese chaff flowerAchyranthes japonica The flowers diverge at nearly a rightangle from the spike, giving the flowerssome what of a bottle-brush look.When the fruit are formed, the spikeselongate greatly and the fruit lay flatagainst the spike . Each fruit has a pairof stiff bracts that aid in dispersal.
Japanese chaff flowerVanderburgh/Warrick County line, near river:Just wanted to let you know that I recently saw Japanese chaffflower (in seed at about 5' tall) actually catch (entangle in seedheads) a bird, in this case, a juvenile downy woodpecker. Ithink the bird was probably aiming at the poke plant nearby.He was struggling to get free, which alerted me to hispresence. I was able to disentangle him from the seed headsand pick as many seeds off him as I could before he "needed"to be let loose.I'm not sure whether you have heard of any other "captures" bythe chaff flower; if not, here's a first. It elevates the durn thingon my list of unfavorite things (tho it was probably at the topalready). Excuse the language, but I call it "The Plant fromHell." I'm not sure whether it could catch a mature bird with itsslicker coat of feathers, but this one still had quite a bit of babyfluff on his belly, etc.Kate Lynch
Mile-a-minute vinePersicaria perfoliata Not yet in Indiana – along Ohio Riverin Ohio.Invasive vine in open habitats
Mile-a-minute vinePersicaria perfoliata
Report IN – and keep invasive species out! Grew out of an Early Detection RapidResponse conference held by theIndiana Invasive Species Council atPurdue University in October 2013 Developed by the Invasive PlantAdvisory Committee, it is a way toquickly and easily report invasivespecies and populate a public map
Report IN has two platforms ORComputerEDDMapS.org/indiana– Useful if you don’t have asmart phone– More detail possible in reportsSmart phoneGreat Lakes Early Detection Network(GLEDN) app Good to report in the fieldEDDMapS DatabaseQueue To Be Verified
Report IN – and keep invasive species out!Go toEDDMaps.org/indianaand start using it today!
flower (in seed at about 5' tall) actually catch (entangle in seed heads) a bird, in this case, a juvenile downy woodpecker. I think the bird was probably aiming at the poke plant nearby. He was struggling to get free, which alerted me to his presence. I was able to disentangle him from the seed heads
