(92) 



6-10 pinnae: leaflets numerous (20-40 in each pinna), rela- 

 tively small. Flowers perfect, in head-like spikes. Calyx 

 quite short, 5-lobed, very different from the corolla in shape 

 and texture. Corolla 5-lobed, the lobes shorter than the tube. 

 Stamens numerous : filaments united below. Ovary stipitate : 

 stvle filiform. Ovules several. Pods flat, readily dehiscent, 

 with membranous or thin-leathery valves. Seeds few. 



(In honor of Dr. Valery Havard, U. S. Army, a diligent 

 student of the North American flora.) 



Distinguished from related genera by the characters given 

 in the generic key. 



1. Havardia brevifolia (Benth.) 

 Pithecolobium brevifolium Benth. ; A. Gray, PL Wright. 

 1 : 67. 1852. 



In valleys, southern Texas and northern Mexico. 



4. ALBIZZIA Durazz. Mag. Tosc. 3: IV. 11. 1772. 



1. Albizzia Julibrissin Durazz. 



Albizzia Julibrissin Durazz. Mag. Tosc. 3: IV. 11. 1772. 

 In sandy soil and open woods, Virginia to Arkansas, Florida 

 and Texas. Naturalized from Asia. 



5. LYSILOMA Benth. Lond. Journ. Bot. 3: 82. 1844. 



1. Lysiloma latisiliqua (L.) Benth. 



Mimosa latisiliqua L. Sp. PL 519. 1753. 



Lysiloma latisiliqua Benth. Trans. Linn. Soc. 30: 534. 



i875- 



In sandy soil, Florida Keys, and in the West Indies. 



6. ACACIA Adans. Fam. PL 2: 319. 1763. 



Leaflets of each pinna mostly more than 20. 



Pods over 15 mm. broad : the ultimate divisions of the leaf-rachis 

 puberulent. . \. A. Berlandicri. 



Pods less than 10 mm. broad : the ultimate division of the leaf- 

 rachis glabrous or with few long hairs. 

 Leaflets of each pinna 40-100, acute. 2. A. filicioides. 



Leaflets of each pinna 20-30, blunt. 3. A. cuspidata. 



Leaflets of each pinna mostly less than 20. 

 Flowers in head-like spikes. 



