Table 2.

Results of fitting diversification models to North American Psoraleeae using Birth-Death Likelihood

	pureBirth	BD	DDL	DDX	yule2rate	yule3rate
Parameters	r 1 = 0.58	r 1 = 0.58	r 1 = 0.93	r 1 = 0.74	r 1 = 0.76	r 1 = 0.35
		a = 0	k = 68.18	x = 0.081	r 2 = 0.11	r 2 = 0.96
					st = 0.45	r 3 = 0.11
						st 1 = 2.05
						st 2 = 0.44
Ln(L)	54.723	54.723	56.242	54.829	61.654	64.588
AIC	-107.445	-105.445	-108.484	-105.658	-117.308	-119.177
ΔAIC	0	2	-1.039	1.787	9.863	11.732

The maximum clade credibility chronogram was calibrated such that the divergence of Hoita and Pediomelum was scaled to 5.8 mya. r = net diversification rate (speciation events per million years); a = extinction fraction; st = time of rate shift (mya); k = carrying capacity parameter; x = rate change parameter; Ln(L) = Log-likelihood; AIC = Akaike information criterion; ΔAIC = change in AIC relative to pureBirth.