458 FOXWORTHY. 



Albizzia groups, because, in practice, I have not found them readily 

 •distinguishable. The different types of structure as T have recognized 

 them are : 



1. OUGEINIA-ALBIZZIA TYPE. 



Vessels moderately large, scattered or more or less distinctly radially 

 or concentrically grouped; distinctly fringed with wood parenchyma, 

 which usually forms elongated patches, which are sometimes almost con- 

 tinuous concentrically. This is much the largest and most representative 

 group in the family. Examples of this type of structure are: Ougeinia 

 daibergioideSj Inttia bijuga, Albizzia procera. 



1. ACACIA-CASSIA TYPE. 



Vessels inclosed in irregularly shaped patches of wood parenchyma, 

 which are more or less united into a reticulate pattern. Cassia fistula, 

 C. nodosa, and many species of Acacia. 



3. DALBERGIA TYPE. 



Vessels ringed, rather scanty, usually independent of the narrow, wavy, 

 numerous regularly distributed bands of wood parenchyma. Dalbcrgia 

 spp., Ptcrocarpus spp., Dialium spp. 



4. BAUHINIA TYPE. 



Numerous, regularly distributed, rather broad, concentric bands of 

 wood parenchyma, usually inclosing the pores. Cynometra, Crudia 

 blancoij Bauhinia. 



5. HARDWJCKIA TYPE. 



Vessels scattered, not inclosed in patches of wood parenchyma, con- 

 centric bands of wood parenchyma usually wanting. Sindora, Eard- 

 wicJcia, Caesalpinia sappan. 



0. ERYTHRINA TYPE. 



Vessels large, scanty, unequal, irregular. Alternate broad bands of 

 wood parenchyma and fibers making, with the pith-rays, a tesselated 

 pattern. Erythrina, Butca and Mi/lcllia. 



These different forms may be tabulated in a key as follows: 



Wood parenchyma prominent about vessels or arranged concentrically. 

 Wood parenchyma in patches surrounding the vessels. 



Wood parenchyma patches not continuous Ougcima-Albi-ia type 



Wood parenchyma patches connected and forming definite pattern. 



Patches united to form reticulate pattern Acacia-Cassia type 



Wood parenchyma forming concentric lines. 



Lines narrow, wavy, numerous usually not inclosing pores Dalbcrgia type 



Lines moderately broad, inclosing pores Bauhinia type 



Lines very broad, wood very soft Erythrina type 



Wood parenchyma not prominent Hardwichia type 



