1	"Leaves simple"	"Boswellia occulta"
1	"Leaves compound, odd-pinnate"	2
2	"Leaflets with entire margins, up to 18 mm long and 10 mm wide but usually much smaller"	"Boswellia neglecta"
2	"Leaflets with crenate to undulate-sinuate margins, often much larger than 18 mm long and 10 mm wide"	3
3	"Leaflets up to 23 mm long and 12 mm wide; filaments densely pilose; fruits pubescent"	"Boswellia rivae"
3	"Leaflets oftem much larger; filaments glabrous; fruits glabrous"	4
4	"Leaves pubescent to densely tomentose, especially on the lower surface, usually with crenate margins; petals white; disk shortly tubular; fruits 3-4(-5) celled"	"Boswellia sacra"
4	"Leaves glabrous, minutely glandular or, rarely, sparsely pubescent, with undulate-sinuate margins; petals reddish or greenish red; disk flattened, saucer-shaped; fruits (5-)6(-8)-celled"	"Boswellia frereana"