TABLE 2.

Percentage pollen viability (on and above the diagonal) and the number of rearranged chromosomes (below diagonal) derived from crosses within and among populations of H. annuus, H. petiolaris, and their stabilized hybrid derivatives, H. anomalus, H. deserticola, and H. paradoxus

Taxon	H. annuus	H. anomalus	H. deserticola	H. paradoxus	H. petiolaris
H. annuus	94.3 (0.7)	2.6 (0.1)	4.9 (0.9)	9.1 (0.5)	4.8 (0.2)
H. anomalus	9	94.5 (0.9)	42.9 (3.9)	14.8 (2.8)	3.0 (0.1)
H. deserticola	9	10	90.3 (3.1)	35.9 (3.9)	2.5 (0.7)
H. paradoxus	9	11	11	95.6 (1.1)	10.9 (0.6)
H. petiolaris	10	10	9	11	94.9 (0.8)

Standard errors are in parentheses. Pollen viabilities for crosses among H. annuus, H. anomalus, and H. petiolaris are from Rieseberg (2000).