192
J. HESLOP-HARRISON
Petal
Winter
colour
Petal
length
Leaf
number
length
FIQ. 2. (a) Statistical correlations between pairs of characters in 992 F, progeny of
Potentilla glandulosa subsp. 72evadensw x P. glandulosa subsp. tgpicu. (b) Statistical
correlations between pairs of characters in 570 F, progeny of Potentilla glandulosa subsp.
nevademia (subalpine form) x P . glandulosa subsp. rejexa (foothill form). I n each figure,
a heavy line indicates r = 0.25-0.80, a light line, r = 0.09-0-25 and a broken line, r =
0-0&0.09 (insignificant). (From Clausen and Hiesey, 1958.)