R22 
colour, while the remainder have flowers with white sepals, white 
or very pale rose petals and red to purple styles and stigmas. 
While colour variations in different individuals (purple, 
magenta, violet, dingy white, pure white) are not uncommon in 
Calluna, the occurrence of two distinct colours in the same stock 
is rare, and recalls to mind some of the well-known graft-hybrids 
e. ye A 
Sie et by Lindman (Bot. Not. 1907, p. 201) in a plant col- 
lected some miles north of Stockholm, Sweden. The author 
pp. 966 seq., and the more modern work on flower colours with 
special reference to genetics is dealt with in M. Wheldale, ‘‘ The ° 
1916 
coloration : 
_1. Potycuromy, indicating many colours or variegated colora- 
tion in the same corolla. Thus Lin 
prolet and orange) and Convolvulus tricolor three colours (violet- 
e 
this connection. The polychromy of a hybrid is often due to the 
mixing of the parental colours (e.g. Dianthus, Iris) 
_ &. Hererocnromy, indicating colour differences between the 
individuals of one species. This ; know 
: ample 
Hepatica triloba, Melampyrum eristatum, Anthyllis vulneraria, 
Species is not infrequent. Jackson (l.c.) defines ‘* heterochroma- 
tism”’ as ‘‘a change in the colouring or marking of petals.’ 
3. Ampuicnromy, indicating diff 
flower on the same stock, this is mos 
other accidental influence, Tt is habi 
