IN PLANTS HAVING IRREGULAR COROLLAS. 411 
type which came under our notice had the normal number of 
parts to the flower arranged in an abnormal symmetry. There 
were only ¢wo larger streaked petals in the lower lip of the 
corolla, whilst there were three instead of two smaller, unstreaked 
petals in the upper lip. The arrangement of the stamens was 
only examined in one of the flowers, but in this specimen it was 
interesting to remark that the nature of the stamens appeared to 
be affected by the change in symmetry in the corolla. There 
were four stamens here as in normal flowers; but instead of 
two fertile and two infertile stamens, there was only one 
fertile stamen and three infertile stamens. The fertile stamen 
occupied a median position, between the two anterior petals of 
the lower lip (Pl. LI. fig. 5). The position of the rudimentary 
Stamens is indicated in the figure. There was no hump on the 
corolla-tube. If we suppose that the plane of symmetry about 
which the flower developed had moved round to the right through 
yoth of a circle from the normal, the position of rudiments is 
easily comprehended. 
6. Flowers with 6-petalled, bilaterally symmetrical corolla.— 
Of these we have had several instances on different species of 
Streptocarpus. 
(a) A flower from S. Rexii, having three petals in the upper 
lip instead of two, the odd median petal being somewhat smaller 
than the lateral ones. Stamens as in normal flower. 
(b) Flowers from S. sp. ?, having four petals instead of three 
in the lower lip, and two in the upper lip. Stamens 3 or 5 
(EE LE. do. 2), - 
7. Flowers with 7-petalled, bilaterally symmetrical corolla.— 
Of such flowers we have only seen one specimen (Pl. L. fig. 25). 
The calyx consisted of seven sepals, and the corolla of four 
petals in the upper lip and three in the under lip. The stamens 
were normal. This flower might be described as one in which 
the posterior petals and postero-lateral sepals were each repre- 
sented by two segments. 
Asymmetrical Forms.—Of these there are a great diversity, 
and it would not be profitable here to describe thein in detail. 
They appear to be much more frequent on some species than 
others; on S. Rexii we have found hardly any whilst on other 
Species they are of frequent occurrence. Forms with more than 
the normal number of petals are asymmetrical very much oftener 
than forms with a reduced number of petals. 
