Issue 3 2013 Lo-res PDF - Passion Flowers

Flower colour
The ancestry of P. ‘Berkeley’ is unknown, but on the basis of its morphology and hardiness it appears to be a hybrid of
P. subpeltata and P. caerulea. The flower colour of P. ‘Berkeley’ shows considerable variability, and this is related to the conditions
under which it is grown. The corona filaments of plants grown outside have a variable blue banding, see Figs. 2a and 2b) while
those grown under glass are almost pure white, see Fig. 2c
Passiflora Online Journal February 2013
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Fig 2a. P. ‘Berkeley’.
Flower (Grown outside)
Image by Martin Murray.
Fig 2b. P. ‘Berkeley’.
Flower (Grown outside)
Image by Sally Levinson.
Fig 3a. P. ‘Amethyst’
Flower (outside)
Image by Martin
Murray
Fig 2c. P. ‘Berkeley’.
Flower (Grown inside)
Image by Dr Les King.
In P. ‘Amethyst’, a different
form of colour variation can be
unambiguously associated with
temperature. Flowers that develop
late in the year in cold weather
exhibit white petals and sepals (see
Figure 3). This is not a function of
low light levels in winter months
since plants grown in winter in a
heated conservatory have a normal
colour.
Figure 3a shows the normal flowers
of P. ‘Amethyst’. Figure 3b shows
the effect of low temperature
on colour.
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Passiflora Online Journal February 2013
Fig 3b. P. ‘Amethyst’ Flower (Grown
inside) and the effect of low temperature
Image by Dr Les King