LEGUMINOSAE 75 



with hard yellow and brown wood with the larger ducts some- 

 what crowded in spring and the smaller in tangential waves in 

 the fall growth, and moderate medullary rays; moderate zig- 

 zag roundish twigs; roundish continuous pith; alternate raised 

 leaf-scars, for a time concealing the small superposed rounded 

 buds and with 3 bundle-traces; bristle-like or spinescent sti- 

 pules; no end-bud; typically odd-pinnate leaves with entire 

 stipellate leaflets; showy perfect papilionaceous white or rosy 

 flowers in axillary racemes; and rather small flat few-seeded 

 legumes. 



1. Twigs neither glandular nor bristly. 2. 

 Twigs bristly. 10. 



Twigs with sticky glands, not bristly. R. viscosa. 



2. Twigs prickly: pods bristly. R. Kelseyi. 

 Twigs not prickly. 3. 



3. Tree round or ovoid. 4. 



Tree pyramidal. R. Pseudacacia pyramidalis. 



4. Unarmed. 5. 



With stipular spines. 6. 



5. Branching open. R. Pseudacacia inermis*. 

 Branching compact. R. Pseudacacia umbraculifera. 



6. Leaves mostly of only 1 leaflet. R. Pseudacacia monophylla. 

 Leaves distinctly compound. 7. 



7. Weeping. R. Pseudacacia pendula. 

 Not weeping. 8. 



8. Leaves green. 9. 



Leaves yellow. R. Pseudacacia aurea. 



9. Flowers white. (Locust). R. Ps'eudacacia. 

 Flowers rosy. R. dubia. 



10. Without sticky glands. (Rose acacia). R. hispida. 



With both glands and bristles. R. neo-mexicana. 



COLUTEA. Bladder Senna. 



Deciduous shrubs with more or less shredding bark; 

 rounded or angular twigs; rather angular homogeneous pale 

 pith; alternate small somewhat raised crescent-shaped leaf- 

 scars with 1 or usually 3, 5 or 7 bundle-traces in a single series; 



