6 FLORA OF JAMAICA Mimoseoe. 



§ 19. Parts of the flower in 6's or 4's. Flowers in 

 globular heads. Stamens as many as, or twice as 

 . many as, the petals; anthers without glands. 

 Pollen granules numerous, distinct. 

 Parts of the flower in 5's. Calyx campanulatc. 



Gland between the lowest pair of pinnae 41. Desmanthus. 



Gland in middle of petiole, or just below the 



pinnae, or wanting 43. Leticsena. 



Parts of the flower in 4*3. Calyx minute 42. Mimosa. 



§ 20. Parts of the flower in 5's or 4's. Flowers in 

 globular heads, or in spikes (in ^. swma). Stamens 

 indefinite, generally numerous, distinct or slightly 

 united at the base. Pollen granules in 2-6 masses 



in each cell - 44. Acacia. 



§ 21. Parts of the flowers in 5's. Stamens indefinite, 

 sometimes few, united at the base or into a tube. 

 Anthers small. Pollen granules in 2-6 masses in 

 each cell. 

 Leaves bipinnate. 



Pod strap-shaped, straight or slightly curved t 



valves elastically revolute from the apex 45. Calliandra. 

 Pod broadly oblong, straight, thin, continuous 

 within, valves not opening elastically nor 



twisted 46. Alhizzia. 



Pod curved and twisted spirally, continuous 



within, splitting open 47. Pithecellobium. 



Pod straight or curved, continuous within, 



tardily opening 48. Zygia. 



Pod ciirved or straight, thick, not opening, 



with partitions between the seeds ^9. Enterolobium. 



Leaves simply abruptly pinnate 50. Inga. 



Subfamily 1. PAPILIONATM 



Flowers papilionaceous (that is, like a pea-flower). Sepals 

 normally 5, united into a tubular or campanulate calyx. Petals 

 5, imbricate : the upper — the " standard," exterior ; the 2 lateral 

 — the " wings " ; the 2 lower interior and generally parallel 

 and united — the "keel." Stamens genei'ally 10 (numerous in 

 Swartzia) ; filaments united into a sheath enclosing the pistil, 

 the uppermost often more or less free or sometimes wanting 

 (all distinct in §§ 11 and 12) ; anthers all alike, or sometimes the 

 alternate different. Radicle inflexed, accumbent on the coty- 

 ledons. Leaves digitately or pinnately compound, or sometimes 

 .simple. 



§ 1. Herbs or shrubs (not twining). Leaves simple or 

 digitately 3-5-foliolate, or reduced to spines. Flowers in 

 racemes terminal or opposite the leaves, or solitary or 

 shortly racemose in the axils. Stamens 10, all united 

 into a sheath. Anthers alternately small, versatile, and 

 long, basifixed. Pod 2-valved, inflated in Crotalaria. 



