Inheritance of Mutation in the Common Foxglove. 53 
Fig. 12. A characteristic spike 
of the heptandra form proper. In the 
lower flowers the corolla appears to 
be wholly wanting. In those above 
staminody of the lower lip still per¬ 
sists, but the upper lip develops as a 
flattened petaloid structure. The 
stamens, unrestrained by a corolla- 
tube, are seen diverging in different 
directions. 
together and curving forwards, di¬ 
verge in a horizontal and backward 
direction, owing no doubt to the 
absence of the restraining force 
exerted, in the case of the type 
form, by the enclosing tube of the 
corolla. At the same time the 
ovary and style are directed up¬ 
wards, this again is no doubt due 
to the absence of a corolla tube. 
As a result of this upward incli¬ 
nation of the style, the ring of 
stamens, although becoming de¬ 
tached when the flower is over, 
remains in situ long after it is 
withered, threaded as it were by 
the style ; thus a spike which has 
finished flowering may still be 
covered through-out its length 
with these withered remains. In 
the more petaloid intermediate 
forms the weight of the detached 
portion of the flower is sufficient 
to bend down the style, and the 
whole structure slides off before 
withering as in the type form. 
Bees are able to work all the 
various heptandra forms, and in 
fact seem to visit type and variety 
indiscriminately. But though a 
good quantity of seed is usually 
obtained from exposed heptandra 
plants, the yield from covered in - 
dividuals is always scanty, and in 
a wet season may be almost nil, 
for both pollen and stigma are 
fully exposed to rain, and the 
rotting of the deciduous parts in 
situ favors the growth of mould. 
