▁Category : T own s ▁in ▁W ash ita ▁County , ▁Oklahoma ▁Category : T own s ▁in ▁Oklahoma ▁Category : 1 9 0 1 ▁establish ments ▁in ▁Oklahoma ▁Territ ory <0x0A> </s> ▁Um kom asia ▁is ▁a ▁genus ▁of ▁seed ▁f ern s ▁( P ter idos per mat oph y ta ), ▁and ▁first ▁based ▁on ▁foss ils ▁collected ▁by ▁Ham sh aw ▁Thomas ▁from ▁the ▁Burn era ▁Water fall ▁local ity ▁near ▁the ▁Um k oma as ▁River ▁of ▁South ▁Africa . ▁ ▁He ▁recognized ▁on ▁the ▁basis ▁of ▁cut icular ▁similar ities ▁that ▁the ▁same ▁plant ▁produced ▁pol len ▁org ans ▁P ter uch us ▁and ▁the ▁leaves ▁Dic roid ium . ▁ ▁Description ▁ ▁Um kom asia ▁has ▁hel met ▁like ▁cup ules ▁around ▁ov ules ▁born ▁in ▁complex ▁large ▁branch ing ▁structures . ▁ ▁Wh ole ▁plant ▁associations ▁ ▁Um kom asia ▁fe ist m ant el ii ▁from ▁the ▁Early ▁Tri ass ic ▁of ▁Australia ▁may ▁have ▁been ▁produced ▁by ▁the ▁same ▁plant ▁as ▁P ter uch us ▁bar real ensis ▁( pol len ▁org ans ) ▁and ▁Dic roid ium ▁z uber i ▁( le aves ) ▁Um kom asia ▁mac lean ii ▁from ▁the ▁Late ▁Tri ass ic ▁of ▁South ▁Africa ▁may ▁have ▁been ▁produced ▁by ▁the ▁same ▁plant ▁as ▁P ter uch us ▁a fr ican us ▁( pol len ▁org ans ) ▁and ▁Dic roid ium ▁od ont opter o ides ▁( le aves ) ▁ ▁See ▁also ▁ ▁E volution ▁of