Table 1.

Correlations between pollen tube growth rate* (mm 0·5 h⁻¹) in vivo and sporophytic traits of pollen donors of parental generation in Collinsia heterophylla

Correlated trait	r	d.f.	P
Seedling height, 9 weeks (cm)	0·431	18	0·058
Day of first flowering	−0·234	18	0·32
Final plant height (cm)	−0·266	18	0·26
No. of seeds per capsule	0·378	9	0·25

* Estimated as the difference in pollen tube length between 2 and 1·5 h.