Denshi Jisho — Online Japanese dictionary

にら Chinese chive; garlic chive (Allium tuberosum)
Noun, Usually written using kana alone 
みら Chinese chive; garlic chive (Allium tuberosum)
Out-dated or obsolete kana, Noun, Usually written using kana alone 
かみら Chinese chive; garlic chive (Allium tuberosum)
Out-dated or obsolete kana, Noun, Usually written using kana alone 
にらねぎ broadleaf wild leek (edible plant with hard tubular leaves, Allium ampeloprasum)
Noun 

You can also

Look up kanji details for 韮.

Try a Yahoo Jisho search for 韮 .
Try a Goo Jisho search for 韮 .
Try a Google search for 韮 .