Myrtle-leaf Milkwort 
Naked Tick-trefoil 
Narrow Leaf Bitter Pea 
Narrow-leaf Bird's-foot Trefoil 
Narrow-leaved everlasting-pea 
Narrow-leaved lupine 
Narrowleaf Crimson Clover 
Neustanthus 
Nevada sweet pea 
Nuttall's Ticktrefoil 
Odem's Lens 
Okie Bean 
One-flowered Clover 
One-flowered Horseshoe-Vetch 
Onobrychis caput-galli 
Onobrychis cornuta 
Onobrychis crista-galli 
Onobrychis huetiana 
Onobrychis humilis 
Onobrychis montana 
Onobrychis ptolemaica 
Onobrychis wettsteinii 
Ononis angustissima 
Ononis biflora