Description
                                                                                                            Key Characters:
                                                                            
                                    
                                    
                                                                                                            Growth Form:
                                                                                Shrubs up to 3 m tall.                                        
                                    
                                                                        
                                                                                                                                                                                    
                                                                                                                                                                                    
                                                                                                                                                                                    
                                                                                                                                                                                    
                                                                                                                                                                                    
                                                                                                            Stems:
                                                                                Young stems green, flexible, cylindrical, longitudinally striate, compressable, medullate, glabrous.                                                                                
                                                                        
                                                                                                                                                                                    
                                                                                                            Roots: 
                                                                                                                                                                    
                                                                        
                                                                                                            Leaves: 
                                                                                
                                                                                                                        Leaves simple, few, caducous, scale-like but green.                                                                                 
                                        
                                                                                                                        Alternate.                                                                                 
                                        
                                                                                                                        Blades oblong–linear to lanceolate, 1–3 cm long, 0.2–0.5 cm wide.                                                                                 
                                        
                                                                                                                        
                                        
                                                                                                                        
                                        
                                                                                                                        Surfaces green.                                                                                 
                                        
                                                                                                                        Leaflet margins entire.                                                                                 
                                        
                                                                                                                        
                                        
                                                                                                                        Subsessile.                                                                                 
                                        
                                                                                                                        Stipules absent.                                                                                                                                                            
                                                                        
                                                                                                                                                                                    
                                                                                                                                                                                    
                                                                                                            Flowers:
                                                                                                                        Flowers numerous in terminal racemes.                                        
                                                                                Flowers papilionaceous, pedicellate. Pedicels with a small caducous bract at base and 2 bracteoles at apex.
                                        
                                                                                Calyx spathaceous, split along upper side, minutely 5-toothed.
                                        
                                                                                Corolla yellow, 20–25 mm long, wing petals distinct, shorter than keel, keel obtuse, curved upward.
                                        
                                                                                Stamens 10, connate into a tube; anthers with a tuft of hairs at base.
                                        
                                                                                                                        
                                                                                Ovary superior; ovules numerous.                                        
                                                                                                                                                                                                    
                                                                        
                                                                                                            Fruit:
                                                                                                                        Pods straight; linear; 4–10 cm long; 0.5–0.8 cm wide; pubescent when young; dehiscent; subseptate between the seeds.                                        
                                                                                Seeds 10–18; black; ellipsoid; transversely arranged; 5–7 mm long; 3–4 mm wide with a collar-like rim–aril.                                                                                                                    
                                                                        
                                                                                                                                                                                    
                                                                                                            Ploidy:
                                                                                                                        2n = 48; 52; 54
                                                                            
                                                                        
                                                                                                            Habitat:
                                                                                                                                                            
                                                                        
                                                                                                                                                                                    
                                                                                                            Elevation Range: