This code should do the trick:
function _get_form($form_id){
global $user;
$node = (object) array(
'uid' => $user->uid,
'name' => (isset($user->name) ? $user->name : ''),
'type' => 'ENTER NODE TYPE HERE',
'language' => LANGUAGE_NONE
);
$form_state['build_info']['args'] = array($node);
form_load_include($form_state, 'inc', 'node', 'node.pages');
echo drupal_render(drupal_build_form($form_id, $form_state));
}
You will need to get the node type as well as the form_id for this to work but that shouldn't be to difficult.