diff -r 4675d9c6c66b -r de62daaf2054 hgext/evolve.py
--- a/hgext/evolve.py	Tue Jun 12 11:08:27 2012 +0200
+++ b/hgext/evolve.py	Tue Jun 12 11:14:02 2012 +0200
@@ -112,6 +112,8 @@
 
         user = commitopts.get('user') or old.user()
         date = commitopts.get('date') or None # old.date()
+        extra = dict(commitopts.get('extra', {}))
+        extra['branch'] = head.branch()
 
         new = context.memctx(repo,
                              parents=newbases,
@@ -120,7 +122,7 @@
                              filectxfn=filectxfn,
                              user=user,
                              date=date,
-                             extra=commitopts.get('extra') or None)
+                             extra=extra)
 
         if commitopts.get('edit'):
             new._text = cmdutil.commitforceeditor(repo, new, [])
@@ -352,8 +354,6 @@
      _('use text as commit message for this update')),
     ('c', 'change', '',
      _('specifies the changeset to amend'), _('REV')),
-    ('b', 'branch', '',
-     _('specifies a branch for the new.'), _('REV')),
     ('e', 'edit', False,
      _('edit commit message.'), _('')),
     ] + walkopts + commitopts + commitopts2,
@@ -389,12 +389,6 @@
     if change == '.':
         change = 'p1(p1())'
     old = scmutil.revsingle(repo, change)
-    branch = opts.get('branch')
-    if branch:
-        opts.setdefault('extra', {})['branch'] = branch
-    else:
-        if old.branch() != 'default':
-            opts.setdefault('extra', {})['branch'] = old.branch()
 
     lock = repo.lock()
     try:
@@ -421,7 +415,7 @@
             updatenodes = set(cl.nodesbetween(roots=[old.node()],
                                               heads=[head.node()])[0])
             updatenodes.remove(old.node())
-            okoptions = ['message', 'logfile', 'edit', 'user', 'branch']
+            okoptions = ['message', 'logfile', 'edit', 'user']
             if not updatenodes:
                 for o in okoptions:
                     if opts.get(o):