IN PLANTS HAVING IRREGULAR COROLLAS. 409 
Norma Frower. 
The normal flower of Streptocarpus Rexii is pentamerous, with 
a calyx of five sepals and a corolla of five petals. The corolla is 
bilabiate, the upper lip consisting of two petals and the lower 
lip of three petals (Pl. L. fig. 23). The colour of the corolla is 
pale greyish blue. The petals of the upper lip are of this colour 
without any markings upon them, but the three petals of the 
lower lip are streaked with bands of dark blue. There are two 
perfect stamens in the normal flower, situated on either side of 
the odd anterior petal, and two rudimentary stamens (small 
barren anthers without filaments) opposite the posterior and 
lateral sepals. In normal flowers there is a large pit about half- 
way down the corolla-tube, situated in the posterior middle line, 
and visible from the outside of the tube as a well-marked hump. 
A trace of an anther is generally to be found in this pit, repre- 
senting an odd posterior and median fifth stamen (Pl. LI. fig. 1). 
ABNORMAL FLowErs.—I. PELORIC OR ACTINOMORPHIC. 
l. Peloric flowers with 5 petals.— We have only seen one 
flower of this type on S. Reæii, but we have seen several on plants 
of S. polyanthus at Kew, where they seem to be of rather frequent 
occurrence. In the ease of S. polyanthus the flowers we examined 
differed from the zygomorphic ones in standing upright instead 
of in a more or less horizontal position. The corolla was per- 
fectly actinomorphic, and all five petals had assumed the character 
of the petals of the lower lip in normal flowers, 7. e. all were 
streaked with bands of dark colour. There were four fertile 
stamens, the posterior rudimentary stamens being perfectly 
developed, and equal in length to the two anterior stamens. All 
four stamens were united by their anthers and clasped the 
stigma in a ring. In the flowers we examined there was no trace 
of a fifth stamen. The only flower of S. Herii which we have 
seen pelorie in five parts was remarkable in having jive perfect 
stamens, 
2. Peloric flowers with 4 petals —We have seen three or four 
flowers of this type, in which the calyx and corolla were reduced 
to a symmetry of four instead of five (Pl. LI. fig. 4). The four 
petals of the corolla were equal in size, and all equally marked 
with bands of dark blue. The stamens were arranged 1n the same 
way as those in the pentamerous peloric flowers. In the flowers 
we examined there was absolutely no trace of any fifth petal. 
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