PERKINS THE LEGUMINOSAE OF PORTO RICO. 



135 



Legume flat, thin, indehiscent, or 

 dehiscent with valves that are not 

 contorted. 

 Legume straight or slightly curved; 

 valves separating elastically longi- 

 tudinally from apex to base. 

 Stamens free, the inner ones sometimes 

 united, forming a very short ring; carpel 

 always 1. (Acacieae.) 

 Stamens (as many as or) twice as many as petals. 

 Anthers eglandular. (Eumimoseae.) 



Valves of the legume separating from the 

 persistent sutural replum. 

 Legume flatly compressed. 

 Legume subquadrangular. 

 Valves of the legume adhering to the 

 sutural replum. 



Legume narrowly linear; seeds longi- 

 tudinal or oblique. 

 Legume broadly linear; seeds trans- 

 verse. 

 Anthers in the bud bearing a sessile or more 

 often stipitate gland, which usually has 

 disappeared at the time of flowering. 

 Seeds with endosperm. (Adenanthe- 



REAE.) 



Flowers capitate. 

 Flowers spicate or racemose. 

 Seeds without endosperm. (Piptade- 

 nieae.) 



Flowers in globose heads (in the 

 Porto Rican species) or in spikes; 

 legume flat, 2-valved, valves con- 

 tinuous, entire. 

 Flowers in spikes; legume straight 

 or arcuate, sometimes of enormous 

 size, woody, coriaceous, or papery; 

 sutures more or less thickened, 

 persisting after the separation of 

 the 1-seeded articulations as a re- 

 plum. 

 Flowers zygomorphic, not papilionaceous; petals im- 

 bricate in the bud, the posterior one included in 

 estivation. 



Leaves abruptly pinnate; calyx lobes free to the 

 disk; petals 0, 1, or 5; ovules 1 to 4. (Cynome- 



TKEAE.) 



Leaves without black glandular dots; petals 



on the outside levigate; stamens usually 



glabrous. 

 Leaves on the under surface with black 



glands; petals on the outside verrucose; 



stamens lanate-pilose. 



3. Albizzia (p. 142). 



4. Calliandra (p. 143 ). 



5. Acacia (p. 144). 



8. Mimosa (p. 147). 

 7. SchranMa (p. 146). 



9. Desmanthas (p. 148). 

 6. Leucaena (p. 146). 



10. Neptunia (p. 148). 



11. Adenanthera (p. 149). 



12. Piptadenia (p. 150). 



13. Entada (p. 150). 



('AESALPINIOIDEAE. 



14. Cynometra (p. 151). 



15. Slaklia (p. 151). 



