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FOXWORTHY. 
Albizzia groups, because, in practice, I have not found them readily 
distinguishable. The different types of structure as I 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 
dalbergioides, Intsia bijuga, Albizzia procera. 
2. 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. Dalbergia 
spp., Pterocarpus spp., Dialium spp. 
4. BAUHINIA TYPE. 
Numerous, regularly distributed, rather broad, concentric bands of 
wood parenchyma, usually inclosing the pores. Cynometra, Crudia 
blancoi, Bauhinia. 
5. HARDWICKIA TYPE. 
Vessels scattered, not inclosed in patches of wood parenchyma, con- 
centric bands of wood parenchyma usually wanting. Sindora , Ilard- 
wicTcia, Caesalpinia sappan. 
6. ERYTHRINA TYPE. 
Vessels large, scanty, unequal, irregular. Alternate broad bands of 
wood parenchyma and fibers making, with the pith-rays, a tesselated 
pattern. Erythrina, Butea and Millettia. 
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 Ougeinia- Albizzia 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 Dalbergia type 
Lines moderately broad, inclosing pores Bauhinia type 
Lines very broad, wood very soft Erythrina type 
Wood parenchyma not prominent Hardimckia type 
