Jeff Plakke, manager of landscapes at Matthaei-Nichols, describes another key negative of black locust. Black locust (Robinia pseudoacacia L.) is a legume belonging to the pea (Fabaceae) family. UM Board of Regents. The leaves are imparipinnate and the flowers are white. Morphology Size and shape: It is a medium-sized tree, averaging 12 to 30 m in height and 30 to 60 cm (up to 150 cm) in diameter. Black locust is resistant to black walnut toxicity. CLASS OF SIGNS: Depression, poor appetite, weakness, paralysis, abdominal pain, diarrhea (which may be bloody) and abnormalities in the heart rate and/or rhythm. The information in the table is fairly self-explanatory but a few words are in order regarding the Reaction column. Toxicity. Flowering blooms lead to 3-4 inch brown seed pods which look like dried, flat pea pods containing 4-8 seeds; pods persist through the winter. Clinical Signs: Vomiting, depression, anorexia, weakness, difficulty breathing, diarrhea (bloody), death. Black locust seed pods. Black locust contains several toxic components in its leaves, stems, bark and seeds. You can identify black locust (Robinia pseudoacacia, hardy in USDA zones 4 through 8) by the 1-inch-long, white, fragrant flowers held in pendant clusters in the late spring. Leaves are variably smooth or hairy. Poisoning and death have been reported for horses consuming bark, leaves, or sprouts. The wood of var. Black locust (Robinia pseudoacacia) is a perennial shrub or medium-sized, deciduous, fast-growing tree from the bean (Fabaceae) family. Some animals recover despite showing clinical signs, an indication of the dose-dependent nature of the toxin. Story goes that a black locust fence post will wear out two post holes. Katie volunteers for her kids’ school, for Carleton College as an alumni volunteer, and in her neighborhood to organize community events. The black locust tree (Robinia pseudoacacia) is extremely poisonous if consumed. All parts of the plant are poisonous, especially the pods, seeds, bark and leaves. Black Locust (Robinia pseudoacacia). Vomiting of intensely sour fluid, setting teeth on edge.-Vomiting of ropy mucus; tinged with blood; retching and epigastric pains.-Vomiting, with slight convulsions.-Sour stomach.-Dull, heavy, aching dulness in stomach. If you think that your animal is ill or may have ingested a poisonous substance, contact your local veterinarian or our 24-hour emergency poison hotline directly at 1-888-426-4435. Allergies/Toxicity: Although severe reactions are quite uncommon, Black Locust … Clusters of white flowers, one-fourth inch across, bloom in midsummer and are followed by small, black fruits. All parts of the plant are poisonous, especially the pods, seeds, bark and leaves. The health and vigor of the trees are important defenses against devastation, as research has shown that good growing conditions are more important than genetic resistance. Toxic Tree. Honey locust (Gleditsia triacanthos, pea family) has been implicated in causing similar toxic signs, but the information on this is not clear. It first appeared in the June 1990 issue of American Woodturner and was derived from a number of reference sources, listed below the table. The stems are angled in cross-section and sometimes spiny. Question A single stem can regenerate the entire clone, sometimes even more rapidly.  They are often planted along highways and fencerows as ornamentals and for erosion control. SYMPTOMS. Black locust Robinia pseudoacacia Black locust is native to the southern Appalachians and the Ozarks, where it occurs on slopes and forest edges. Horses are especially susceptible to these chemicals, which can be fatal. They are boiled and used like peas. However, the most notable feature of the black locust is its toxicity. Black locust (Robinia pseudoacacia), as it has come to be called, offers superb qualities. The toxins affect the gastrointestinal tract as well as the nervous system. The black locust tree (Robinia pseudoacacia), also called false acacia, grows in U.S. Department of Agriculture plant hardiness zones 3 to 8. Important constituents of the plant are the toxalbumin robin, which loses its toxicity when heated, and robinin, a nontoxic glucoside. Michigan Web Design by Boxcar Studio. See the articles Wood Allergies and Toxicity and Wood Dust Safety for more information. From contributor A: A pair of sharp thorns grows at each node. "Toxicity: Black locust is poisonous to all animals if ingested. Paints and sprays to prevent wood chewing may be tried, but long-term success with these treatments may be difficult. Black Locust Poisoning. Two distinguishing features are flowers and thorns. Of grazing animals, horses are most susceptible to the effects of black locust. The wood is weak and brittle, subject to storm damage. Toxicity. “It tips the balance for the whole plant community by making abundant what once was a limiting essential nutrient. R. pseudoacacia's dark brown bark is rough with interlaced ridges. It has been planted widely in Iowa for post The flowers are creamy white and are not toxic. SIGNS: This discussion will center on the effects in horses, the species most likely to be poisoned by black locust. She holds an M.A. Black locust is toxic to humans and can cause discomfort and irritation, but is not life-threatening. It is also often planted as an ornamental tree for its showy aromatic flowers and hard, durable wood. Inkberry, Poke weed. Although fatal cases are rare, recovery may take several days or even weeks. The Tree is a deciduous tree, it will be up to 25 m (82 ft) high. Black Locust wood is not toxic, however, just like any other tree it can trigger allergies. Herbicidal use is generally necessary for control, once a site has been thoroughly evaluated for the presence of native species, how close it is to wetlands or other water sources, effectiveness, and residual effects of indicated herbicides (i.e., does it linger in the soil). Removal of sprouts through cutting and bulldozing generates new growth. Death is possible. DANGEROUS PARTS OF PLANT: Leaves, especially wilted leaves, young shoots, pods, seeds, inner bark. Similarly, its fruit is used in livestock feed. Some horses are wood and bark chewers, however, and for these horses is may be necessary to fence off the trees or utilize a different pasture to prevent toxicosis. What Are the Dangers of Black Locust Tree Thorns? Shelled seeds are safe to harvest from summer through fall, and are edible both raw and/or boiled. Found this for you... https://www.oardc.ohio-state.edu/weedguide/singlerecordframe2.asp?id=390 Native geographic location and habitat. Black locust is a fast growing tree that matures to 50-100 feet tall, described as having a “narrow crown and open, irregular form with contorted branches.” Leaves are alternate, pinnately compound, up to 14 inches long, with 7-21 oval-shaped 1-2” inch bluish-green leaflets on the upper side, lighter green on the underside, turning yellow in fall. Locust borer is a serious pest of black locust. The leaves, especially wilted leaves, young shoots, pods, seeds and inner bark are toxic. Leaves are alternate and pinnately compound with oval, entire leaflets (fig. Black locust is unique in being the only woody invasive species addressed by the WIGL Collaborative to date that is native to North America. Responds very well to both lathe turning and steam bending; glues and finishes well. Scientific Name: Robinia pseudoacacia Additional Common Names: false acacia Toxic Principle: Black locust’s bark and leaves are toxic, various reports suggest that the seeds and the young pods of the black locust may be edible when cooked, since the poisons that are contained in this plant are decomposed by heat. Fragrant, pea-like white blooms with five irregular petals appear in May-June on long clusters. The consumption of a 1/2 pound of leaves or bark can kill a 1,000-pound horse. Reference Burrows GE, Tyrl RJ (Eds. If you suspect your pet may have ingested a potentially toxic substance, call the APCC at (888) 426-4435 or contact your local veterinarian as soon as possible. Photo by L. Wallis. They are ½ to ¾ inches long, and very stout. Copyright © 2020 Matthaei Botanical Gardens & Nichols Arboretum.Privacy. Be extra cautious around affected horses to prevent human injury, and these horses should not be ridden until all clinical signs have resolved. ANIMALS AFFECTED: Horses are particularly at risk, but all animals ingesting the plant may be poisoned. Common Names: Black Locust, Robinia, False Acacia Distribution: Central-Eastern United States (also widely naturalized in many temperate areas worldwide) Color/Appearance: Color can range from a pale greenish-yellow to a darker brown Janka Hardness: 1,700 lb f Density: 4.0 lb/b.f. Black locusts are common in well-drained woods, thickets, and waste areas, especially in the southeastern part of the state. Ingesting black locust thorns, bark or leaves may cause colic, weakness, kidney failure, tachycardia and depression. Toxicity . A pair of sharp thorns grows at each node. It tolerates a wide range of soil conditions, and spreads clonally as well as by seed. 52,53 The toxic principle is classified as a lectin, which is present in seeds, sap, roots, wood, leaves, and bark of the plant. Identification Habit: Black locust is a deciduous, medium-sized tree ranging in height from 12-25 m (40-82 ft) and 30-60 cm (12-24 in) in Its historic native range was small compared to its current distribution and was constrained to the Appalachian Mountains … Black locust thorns grow from one-fourth of an inch to one inch in length. The second tallest locust, it reaches 40 to 70 feet tall. It can cause dizziness, nausea, vomiting, diarrhoea, convulsions and drowsiness. Diagnosis of black locust poisoning is based on the clinical signs, and evidence that the bark or new growth of the tree has been eaten. Young seedpods - cooked. It has been suggested that flowers are toxic as well. The honey locust, on the other hand, can grow pods to as long as 10-12 inches. Its natural range extends from Pennsylvania southwest ward to Alabama and west ward to southern Illinois. (pea family). This signs and symptoms information for Black locust poisoning has been gathered from various sources, may not be fully accurate, and may not be the full list of Black locust poisoning signs or Black locust poisoning symptoms. Black locust requires annual and long term monitoring as it may resprout several years after herbicidal treatment appears to have eradicated it. Its crown is narrow with an open, irregular form and contorted branches. Black locust ( Robinia pseudoacacia) is an ornamental tree which can reach 40 to 100 feet in height at maturity. Post mortem findings are not specific. Like the honey locust, the black locust reproduces through its distinct hanging pods, but on the black locust they are smaller and lighter and thus easily carried long distances by the wind. There have been reports of children poisoned by chewing the inner bark or eating seeds. The black locust grows 40-100 feet tall and is most common in the southeastern states of the United States. With sufficient amounts ingested, death may occur within a few days, although black locust is not always lethal. Plants sensitive to juglone show signs of wilting, yellow leaves, stunted or slow growth, and eventually death. The consumption of a 1/2 pound of … It is native to North America, and found growing in the Appalachian mountains from Pennsylvania to Alabama as well as parts of the Midwestern United States.Black locust is often planted as an ornamental for landscaping, for its showy aromatic flowers. Seedlings grow rapidly and are easily identified by long, paired thorns. Summary From the few reported cases, toxicity of the black locust tree appears to be caused by the lectin robin. A horse only needs to ingest 0.04% of his body weight to be poisoned by the black locust tree. Poisonous Principle Not Exactly Known. Odor: No characteristic odor. The pulp of the honey locust fruit is edible while the fruits of the black locust is known to be toxic. It has an alternate branching pattern, which creates a zigzag effect. Black nightshade is an annual plant, two-feet high, with many branches. Black Locust Firewood - Toxicity. Disease, pests, and problem resistance. Black locust has a shallow, aggressive root system. Speak to an expert now: (855) 764-7661 Reported from North American Center of Diversity, black locust, or cvs thereof, is reported to tolerate drought, frost, high pH, limestone, low pH, poor soil, slope, stripmine spoil. Black Locust also has a moderate blunting effect on cutting edges. The Black Locust is botanically called Robinia pseudoacacia. A nutritional analysis is available. )Toxic Plants of North America.Iowa State Press. Scientific Name: Robinia pseudoacacia Additional Common Names: false acacia Toxic Principle: Black locust’s bark and leaves are toxic, various reports suggest that the seeds and the young pods of the black locust may be edible when cooked, since the poisons that are contained in this plant are decomposed by heat. 2001, 602-604. https://www.michigan.gov/invasives/0,5664,7-324-68002_71240_73851-379779–,00.html, https://www.michigan.gov/documents/dnr/Black_Locust_389112_7.pdf, https://www.invasive.org/alien/fact/rops1.htm, Photo credits: michiganflora.net, bugwood.org, #matthaeinichols #umichnature #umich #invasiveoftheweek, The Virtual Bard: Shakespeare in the Arb Online. Native to eastern and southern parts of the United States. This year—along with a months-long closure and absent student interns—Katie’s been helping out in a big way with our social media and with blog posts, including this series about staff happenings behind the scenes during these extraordinary times. Despite the potential dangers of Black Locust intoxication, reports of human toxicity after ingestion are rare. Black Locust Firewood - Toxicity. The bark of black locust is deeply furrowed and is dark reddish-brown to black in color. Yes the blooms are a delicious edible, raw or cooked. However, most reported cases involve horses that became ill after eating young shoots or chewing bark. Black locust tree thorns are toxic to people and it is recommended that they not be ingested by animals. About the author: In a normal year, Katie Stannard would be coordinating and onboarding the summer interns at Matthaei-Nichols and helping the visitor engagement team run the visitor center at Matthaei. We report the first human intoxication of Black Locust … from Carnegie Mellon University in literary and cultural theory, and a B.A. If this is unavoidable, provide enough palatable feed so that the horses leave the trees alone. Black locust thorns grow from one-fourth of an inch to one inch in length. Black Locust wood is a hardwood with a Janka hardness scale of 1,700 lbf (7,560 N). The bark, seeds, leaves and twigs of the black locust tree are toxic to humans, cattle, poultry, sheep, and horses. The fruit is a flat brown pod which contains kidney-shaped beans (fig. Ingesting black locust thorns, bark or leaves may cause colic, weakness, kidney failure, tachycardia and depression. contain toxic chemicals that cause neurological and gastrointestinal effects. Continuing on with the flowers, bees apparently love to forage from the black locust blooms. This is now a growing concern to me because I am exposed to this wood everyday. Prickly ash (Zanthoxylum americanum, citrus family) superficially resembles black locust in vegetative aspect and has been blamed for loss of sheep. It is native to the Appalachian mountains from Pennsylvania to Alabama, and a secondary population in the Ozark Mountains, in the United States. Oily. In one study, sprouts that had been cut regrew and blossomed 50% faster and bigger than those that hadn’t been cut. Pre pressure treated lumber it was a good source for lumber that needed to survive ground contact. It’s known to be one of the top trees for honey bees in the US, and the honey produced from black locust pollen is said to be “fruity and fragrant”. 48A). Black Locust is toxic to all classes of livestock. Ingestion results in both gastrointes-tinal and neurological effects which are particularly acute in horses and may be fatal. I have a customer who wants locust fence posts, and claims to have horses that will chew on the fencing. Her current gardening interests include children’s gardens, native plants, and everlasting yet nonintrusive perennials. 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