diff --git a/src/main/java/org/jenkinsci/plugins/workflow/steps/EnvStep.java b/src/main/java/org/jenkinsci/plugins/workflow/steps/EnvStep.java
index a6485c6c..3350d92c 100644
--- a/src/main/java/org/jenkinsci/plugins/workflow/steps/EnvStep.java
+++ b/src/main/java/org/jenkinsci/plugins/workflow/steps/EnvStep.java
@@ -35,7 +35,9 @@
 import java.util.List;
 import java.util.Map;
 import java.util.Set;
+import java.util.stream.Collectors;
 import net.sf.json.JSONObject;
+import org.jenkinsci.plugins.structs.describable.CustomDescribableModel;
 import org.kohsuke.stapler.DataBoundConstructor;
 import org.kohsuke.stapler.StaplerRequest2;
 
@@ -104,7 +106,7 @@ private static final class ExpanderImpl extends EnvironmentExpander {
         }
     }
 
-    @Extension public static class DescriptorImpl extends StepDescriptor {
+    @Extension public static class DescriptorImpl extends StepDescriptor implements CustomDescribableModel {
 
         @Override public String getFunctionName() {
             return "withEnv";
@@ -152,11 +154,34 @@ private static final class ExpanderImpl extends EnvironmentExpander {
                     }
                 }
                 return b.toString();
+            } else if (overrides instanceof Map) {
+                return ((Map<?, ?>) overrides).keySet()
+                    .stream()
+                    .filter(e -> e instanceof String)
+                    .map(Object::toString)
+                    .collect(Collectors.joining(", "));
             } else {
                 return null;
             }
         }
 
+        @NonNull
+        @Override
+        public Map<String, Object> customInstantiate(@NonNull Map<String, Object> arguments) {
+            Map<String, Object> r = new HashMap<>(arguments);
+            final String key = "overrides";
+            Object overrides = r.get(key);
+            if (overrides instanceof Map) {
+                r.put(key, toKeyValueList((Map<?, ?>) overrides));
+            }
+            return r;
+        }
+
+        private static List<String> toKeyValueList(Map<?, ?> map) {
+            return map.entrySet().stream()
+                .map(m -> (String) m.getKey() + "=" + (m.getValue() == null ? "" : m.getValue().toString()))
+                .collect(Collectors.toList());
+        }
     }
 
 }
diff --git a/src/main/resources/org/jenkinsci/plugins/workflow/steps/EnvStep/help-overrides.html b/src/main/resources/org/jenkinsci/plugins/workflow/steps/EnvStep/help-overrides.html
index 6a4a7625..dfd68b9e 100644
--- a/src/main/resources/org/jenkinsci/plugins/workflow/steps/EnvStep/help-overrides.html
+++ b/src/main/resources/org/jenkinsci/plugins/workflow/steps/EnvStep/help-overrides.html
@@ -1,6 +1,11 @@
 <div>
+<p>
     A list of environment variables to set, each in the form <code>VARIABLE=value</code>
     or <code>VARIABLE=</code> to unset variables otherwise defined.
     You may also use the syntax <code>PATH+WHATEVER=/something</code>
     to prepend <code>/something</code> to <code>$PATH</code>.
+</p>
+<p>
+    Environment variables to set can also be defined in a map, each entry of the form <code>[VARIABLE: 'value']</code>.
+</p>
 </div>
diff --git a/src/main/resources/org/jenkinsci/plugins/workflow/steps/EnvStep/help.html b/src/main/resources/org/jenkinsci/plugins/workflow/steps/EnvStep/help.html
index 980ca27e..8ab96e87 100644
--- a/src/main/resources/org/jenkinsci/plugins/workflow/steps/EnvStep/help.html
+++ b/src/main/resources/org/jenkinsci/plugins/workflow/steps/EnvStep/help.html
@@ -11,5 +11,14 @@
 }
 </pre>
 <p>(Note that here we are using single quotes in Groovy, so the variable expansion is being done by the Bourne shell, not Jenkins.)
+<p>Environment variables to be set may also be defined in a map. For example:
+<p><pre>
+node {
+  withEnv([MYTOOL_HOME: '/usr/local/mytool']) {
+    sh '$MYTOOL_HOME/bin/start'
+  }
+}
+</pre>
+</p>
 <p>See the documentation for the <code>env</code> singleton for more information on environment variables.
 </div>
diff --git a/src/test/java/org/jenkinsci/plugins/workflow/steps/EnvStepTest.java b/src/test/java/org/jenkinsci/plugins/workflow/steps/EnvStepTest.java
index 41e41177..73f3855b 100644
--- a/src/test/java/org/jenkinsci/plugins/workflow/steps/EnvStepTest.java
+++ b/src/test/java/org/jenkinsci/plugins/workflow/steps/EnvStepTest.java
@@ -149,6 +149,48 @@ public class EnvStepTest {
         });
     }
 
+    @Test public void mapArguments() throws Throwable {
+        sessions.then(j -> {
+            WorkflowJob p = j.createProject(WorkflowJob.class, "p");
+            p.setDefinition(new CpsFlowDefinition(
+                "node {\n" +
+                    "  withEnv(a: 1, b: 2, c: 'hello world', d: true, e: null) {\n" +
+                    "    echo(/a=$a b=$b c=$c d=$d e=${env.e}/)" +
+                    "  }\n" +
+                    "}", true));
+            WorkflowRun b = j.assertBuildStatusSuccess(p.scheduleBuild2(0));
+            j.assertLogContains("a=1 b=2 c=hello world d=true e=null", b);
+            List<FlowNode> coreStepNodes = new DepthFirstScanner().filteredNodes(
+                b.getExecution(),
+                Predicates.and(
+                    new NodeStepTypePredicate("withEnv"),
+                    n -> n instanceof StepStartNode && !((StepStartNode) n).isBody()));
+            assertThat(coreStepNodes, Matchers.hasSize(1));
+            assertEquals("a, b, c, d, e", ArgumentsAction.getStepArgumentsAsString(coreStepNodes.get(0)));
+        });
+    }
+
+    @Test public void mapArgumentsAsMap() throws Throwable {
+        sessions.then(j -> {
+            WorkflowJob p = j.createProject(WorkflowJob.class, "p");
+            p.setDefinition(new CpsFlowDefinition(
+                "node {\n" +
+                    "  withEnv([A: 1, B: 2, C: 'hello world', D: true, E: null]) {\n" +
+                    "    echo(/A=$A B=$B C=$C D=$D E=${env.E}/)\n" +
+                    "  }\n" +
+                    "}", true));
+            WorkflowRun b = j.assertBuildStatusSuccess(p.scheduleBuild2(0));
+            j.assertLogContains("A=1 B=2 C=hello world D=true E=null", b);
+            List<FlowNode> coreStepNodes = new DepthFirstScanner().filteredNodes(
+                b.getExecution(),
+                Predicates.and(
+                    new NodeStepTypePredicate("withEnv"),
+                    n -> n instanceof StepStartNode && !((StepStartNode) n).isBody()));
+            assertThat(coreStepNodes, Matchers.hasSize(1));
+            assertEquals("A, B, C, D, E", ArgumentsAction.getStepArgumentsAsString(coreStepNodes.get(0)));
+        });
+    }
+
     @Test public void configRoundTrip() throws Throwable {
         sessions.then(j -> {
                 configRoundTrip(Collections.emptyList(), j);