I am making a barplot using barplot2 from gplots and would like to  
format the names of my categorical variables (tree species) on the x- 
axis so that the genus name is above the species name (to save room).  
My code so far is:

speciesnames<-c("Dialium guianensis", "Inga alba", "Tachigali  
versicolor", "Brosimum utile", "Caryocar costaricense", "Castilla  
tunu", "Otoba novagranatensis", "Pourouma bicolor", "Socratea  
exorrhiza")
barplot2(meanapAprilactivity, names.arg=speciesnames, col=columncolor,  
xlab="Species", ylab="Soil acid phosphatase activity (nmol/h/g)",  
plot.ci=T, ci.l=apAprilminusordered, ci.u=apAprilplusordered,  
cex.lab=1.5)

For example, I want 'Dialium' to be located above 'guianensis' on the  
x-axis. Is there a way to do this?

Thanks,

Adrienne Keller


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