274 FLORA OF MADRAS. [Genisteae. 



in 2 lips. Petals 5, rarely fewer, usually free and unequal. 

 Stamens normally 10, rarely fewer, sometimes indefinite, peri- 

 gynous or subhypogynous ; filaments free or variously com- 

 bined ; anthers 2-celled. Ovary free, with, one or more ovules 

 on the ventral suture ; style simple, usually decimate ; stigma 

 capitate, terminal or oblique. Fruit usually dry, a pod splitting 

 open along both sutures, sometimes continuous and in dehiscent, 

 sometimes separating into 1-seeded joints. Seeds usually ex- 

 albuminous ; testa usually hard or leathery, occasionally strophio- 

 otylecl jus fleshy or leafy, the radicle straight or accumbent. 



ANALYSIS OF SUBFAMILIES. 

 Flo v< >morphic; stamens definite : 



Corolla papilionaceous ; petals imbricate, the uppermost (standard) 

 the outermost, the 4 others in 2 opposite pairs ; stamens usually 



combined I. Papilionatae. 



Corolla not papilionaceous ; petals imbricate, the uppermost the 

 innermost, the rest similar to each other ; stamens usually free 



II. Caesalpinioideae. 



Flowers regular ; stamens definite or indefinite ; petals valvate, 

 usually united above the base III. Mimosoideae. 



Subfamily I. PAPILIONATAE. 



Herbs, shrubs, or trees. Leaves alternate, simple or digitately 

 or pinnately compound, rarely bipinnate, sometimes ending in 

 tendrils. Flowers irregular, zygomorphic, rarely subregular, 

 hermaphrodite. Calyx gamosepalous, 5-toothed or -lobed or the 

 upper lobes more or less connate, or bilabiate the 2 upper 

 opposed to the 3 lower, rarely spathaceous. Corolla papiliona- 

 ceous, petals 5, free or adnate to the stamiiial tube, the posterior 

 (standard) outside in bud, the 2 lateral (wings) intermediate, 

 the 2 lower inside and usually cohering by their lower margins 

 (keel). Stamens 10, diadelphous (usually 9 and 1, the one 

 (vexillary) opposite the standard), monadelphous or free. Ovary 

 free ; embryo with an inflexed radicle, cotyledons accumbent. 



Tribe I. GENISTEAE. Herbs or shrubs ; leaves simple or digitately 

 '3 - many - f oliolate ; stamens monadelphous; pod dehiscent, not 

 jointed : 



Stamens combined in a tube cleft above : 



Anthers uniform; keel petals scarcely cohering '1. Rothia. 



