http://en.wikipedia.org/wiki/Dioscorea_alata

if they don't share readings, they can't be together.

@@ -7,12 +7,0 @@
-<k_ele>
-<keb>参薯</keb>
-</k_ele>
-<k_ele>
-<keb>田薯</keb>
-</k_ele>
-<k_ele>
-<keb>沖縄山芋</keb>
-</k_ele>
-<k_ele>
-<keb>台湾山芋</keb>
-</k_ele>
@@ -21,1 +9,0 @@
-<re_restr>大薯</re_restr>
@@ -27,44 +14,0 @@
-<r_ele>
-<reb>しんしょ</reb>
-<re_restr>参薯</re_restr>
-</r_ele>
-<r_ele>
-<reb>シンショ</reb>
-<re_nokanji/>
-</r_ele>
-<r_ele>
-<reb>でんしょ</reb>
-<re_restr>田薯</re_restr>
-</r_ele>
-<r_ele>
-<reb>デンショ</reb>
-<re_nokanji/>
-</r_ele>
-<r_ele>
-<reb>おきなわやまいも</reb>
-<re_restr>沖縄山芋</re_restr>
-</r_ele>
-<r_ele>
-<reb>オキナワヤマイモ</reb>
-<re_nokanji/>
-</r_ele>
-<r_ele>
-<reb>たいわんやまいも</reb>
-<re_restr>台湾山芋</re_restr>
-</r_ele>
-<r_ele>
-<reb>タイワンヤマイモ</reb>
-<re_nokanji/>
-</r_ele>
-<r_ele>
-<reb>ウベ</reb>
-<re_nokanji/>
-</r_ele>
-<r_ele>
-<reb>パープルヤム</reb>
-<re_nokanji/>
-</r_ele>
-<r_ele>
-<reb>ウォーターヤム</reb>
-<re_nokanji/>
-</r_ele>
@@ -73,1 +16,4 @@
-<gloss>purple fleshed yam / sweet potato (Dioscorea alata)</gloss>
+<misc>&uk;</misc>
+<gloss>water yam (Dioscorea alata)</gloss>
+<gloss>winged yam</gloss>
+<gloss>purple yam</gloss>

I think this could do with splitting up a bunch and x-refs adding.

wiki www

bit of a mess, but they all refer to the same species it would seem