Jerusalem Vetchling 
Judas tree 
Juniper Wattle 
Jupiter's Beard 
Kangaroo Thorn 
Kassod Tree 
Knicker Nut 
Koompassia excelsa 
Kudzu 
Large Hop Clover 
Large wedge-pea 
Large-flower Hop Clover 
Large-flowered vetch 
Large-leaf Bush Pea 
Largehead clover 
Lathyrus annuus 
Lathyrus blepharicarpos 
Lathyrus cicera 
Lathyrus ciliolatus 
Lathyrus gloeospermus 
Lathyrus hirticaprus 
Lathyrus inconspicuus 
Lathyrus laxiflorus 
Lathyrus littoralis