diff --git a/grambank/__init__.py b/grambank/__init__.py
index 940f527..e3ec79c 100644
--- a/grambank/__init__.py
+++ b/grambank/__init__.py
@@ -1,6 +1,7 @@
 import functools
 
 from pyramid.config import Configurator
+from pyramid import httpexceptions
 from sqlalchemy.orm import joinedload
 
 from clld.interfaces import (
@@ -57,6 +58,17 @@ def link_attrs(req, obj, **kw):
     return kw
 
 
+def combine_feature_with_family(ctx, req):
+    if 'feature' in req.params and 'family' in req.params:
+        feature_id = req.params.get('feature')
+        family_id = req.params.get('family')
+        query = {'feature': feature_id}
+        raise httpexceptions.HTTPFound(
+            req.route_url('family', id=family_id, _query=query))
+    else:
+        raise httpexceptions.HTTPNotFound()
+
+
 def main(global_config, **settings):
     """ This function returns a Pyramid WSGI application.
     """
@@ -66,6 +78,10 @@ def main(global_config, **settings):
     config.include('clld_phylogeny_plugin')
     config.register_datatable('familys', datatables.Families)
     config.add_route_and_view('faq', '/faq', lambda *args, **kw: {}, renderer='faq.mako')
+    config.add_route_and_view(
+        'combine_feature_with_family',
+        '/_combine_feature_with_family',
+        combine_feature_with_family)
 
     config.registry.registerUtility(GrambankCtxFactoryQuery(), ICtxFactoryQuery)
     config.registry.registerUtility(GrambankMapMarker(), IMapMarker)
diff --git a/grambank/templates/family/detail_html.mako b/grambank/templates/family/detail_html.mako
index 41ab160..0349d88 100644
--- a/grambank/templates/family/detail_html.mako
+++ b/grambank/templates/family/detail_html.mako
@@ -11,6 +11,7 @@
 <%block name="title">Family ${ctx.name}</%block>
 
 <%! from sqlalchemy.orm import joinedload %>
+<%! import sqlalchemy %>
 
 <ul class="nav nav-pills" style="float: right">
     <li class="">
@@ -43,17 +44,28 @@
         <div id="feature-container" class="${'alert alert-info' if feature else 'well well-small'}">
             <p>
                 To display the datapoints for a particular feature on the map and on the
-                classification tree, select the feauture then click "submit".
+                classification tree, select the feature then click "submit".
             </p>
-            <form action="${request.route_url('family', id=ctx.id)}"
+            <form action="${request.route_url('combine_feature_with_family')}"
                   method="get"
                   class="form-inline">
+                <input type="hidden" name="family" value="${ctx.id}" />
                 <select id="ps" name="feature" class="input-xxlarge">
                     <label for="ps">Feature</label>
-                    % for f in features:
-                        <option value="${f.id}"${' selected="selected"' if feature and feature.id == f.id else ''}>
-                            ${f.id} ${f.name}
-                        </option>
+                    ## XXX: This can probably be expressed in SQLAlchemy dot-notation.
+                    <%! query = sqlalchemy.text('''
+                        SELECT DISTINCT parameter.id, parameter.name
+                        FROM value
+                        JOIN valueset ON valueset.pk = value.valueset_pk
+                        JOIN parameter ON parameter.pk = valueset.parameter_pk
+                        JOIN grambanklanguage ON grambanklanguage.pk = valueset.language_pk
+                        WHERE grambanklanguage.family_pk = :family_pk
+                        ORDER BY parameter.id;''')
+                    %>
+                    % for feature_id, feature_name in request.db.execute(query, {'family_pk': ctx.pk}):
+                      <option value="${feature_id}"${' selected="selected"' if feature and feature.id == feature_id else ''}>
+                         ${feature_id} ${feature_name}
+                      </option>
                     % endfor
                 </select>
                 <button class="btn" type="submit">Submit</button>
diff --git a/grambank/templates/parameter/detail_html.mako b/grambank/templates/parameter/detail_html.mako
index 65eee10..ddfa9c0 100644
--- a/grambank/templates/parameter/detail_html.mako
+++ b/grambank/templates/parameter/detail_html.mako
@@ -5,6 +5,8 @@
 <%! active_menu_item = "parameters" %>
 <%block name="title">Feature ${ctx.id}: ${ctx.name}</%block>
 
+<%! import sqlalchemy %>
+
 <%block name="head">
     <link href="${request.static_url('clld:web/static/css/select2.css')}" rel="stylesheet">
     <script src="${request.static_url('clld:web/static/js/select2.js')}"></script>
@@ -60,6 +62,35 @@ ${u.process_markdown(ctx.description, req)|n}
 
 <br style="clear: right"/>
 
+<div class="well well-small">
+    <p>
+        To display the datapoints for a particular language family on the map
+        and on the classification tree, select the family then click "submit".
+    </p>
+    <form action="${request.route_url('combine_feature_with_family')}"
+          method="get"
+          class="form-inline">
+        <input type="hidden" name="feature" value="${ctx.id}" />
+        <select id="fs" name="family">
+            <label for="fs">Family</label>
+            ## XXX: This can probably be expressed in SQLAlchemy dot-notation.
+            <%! query = sqlalchemy.text('''
+                SELECT DISTINCT family.id, family.name
+                FROM value
+                JOIN valueset ON valueset.pk = value.valueset_pk
+                JOIN grambanklanguage ON grambanklanguage.pk = valueset.language_pk
+                JOIN family ON family.pk = grambanklanguage.family_pk
+                WHERE valueset.parameter_pk = :param_pk
+                ORDER BY family.name;''')
+            %>
+            % for family_id, family_name in request.db.execute(query, {'param_pk': ctx.pk}):
+              <option value="${family_id}">${family_name}</option>
+            % endfor
+        </select>
+        <button class="btn" type="submit">Submit</button>
+    </form>
+</div>
+
 <div class="well well-small">
     <p>
         You may combine this variable with a different variable by selecting on in the list below