TABLE 1.

Comparison of map lengths between two parental and three hybrid Helianthus species

Taxa	No. segments compared	Mean dif. (cm)	Std. error (cm)	t-ratio	P > |t|
H. annuus-anomalus	23	−20.59	4.81	−4.28	0.0003*
H. annuus-deserticola	11	−0.09	5.51	−0.02	0.9872
H. annuus-petiolaris	21	−9.27	4.56	−2.03	0.0557
H. annuus-paradoxus	16	−17.9	7.61	−2.36	0.0321
H. anomalus-deserticola	21	18.45	6.59	2.80	0.0110
H. anomalus-paradoxus	20	2.52	4.77	−0.53	0.6041
H. anomalus-petiolaris	20	6.29	5.53	1.14	0.2686
H. deserticola-paradoxus	13	−5.43	3.26	1.67	0.1211
H. deserticola-petiolaris	4	−2.53	15.29	−0.17	0.8793
H. paradoxus-petiolaris	9	17.84	5.93	3.01	0.0168

^*Significant after Bonferroni correction for multiple comparisons.