African and Madagascar Flowering Plants. 373 
forward and dehisce whilst the filaments are straight, then by 
a continuation of the rolling motion become bent back over 
the lower lip : the inner stamens follow suit and finally the 
style elongates and the stigma occupies the position taken by 
the anthers during dehiscence. The calyx is extremely 
viscid and hairy, but in spite of this ants are able to enter the 
flowers and steal honey. The nectaries consist of two short 
tongue-like projections behind and in front of the ovary. 
Visitors : — a Bombylius with a proboscis T 9 oth of an inch long, 
very abundant ; a large yellow butterfly, a small Odynerus ? 
gathering pollen but effecting fertilisation accidentally. — Perie 
Mountains. 
Synelostemon dissitiflorus, Btk. 
This is very similar to the preceding species. The 
nectary is in the form of four tongue-like pieces surrounding 
the ovary. Visitors : — Syrphus ? capensis. 
Pleetranthus Eckloni, Bth. 
The flowers are blue, and as the plant is sometimes eight 
feet high, it forms a very beautiful part of the undershrub in 
the Perie Bush. In the young state all the anthers are rolled 
backwards and included in the corolla-tube, but as the flowers 
ripen, the outer stamens uncoil and roll forwards dehiscing 
while the filaments are in a line with the corolla-tube : then 
by a continuance of the rolling motion they coil themselves 
round the lower lip. The second pair of stamens follow them 
and dehisce almost in the same position and then like the 
first roll themselves round the lower lip. Lastly the style 
rises and occupies nearly the same position as the stamens, 
while its stigmatic lips unclose and are ready for fertilisation. 
Visitors : — Apis mellifica collecting pollen ; a Bombylid sucking 
and effecting cross-fertilisation. Two Lepidoptera. 
P. fruticosus, Herit. 
A near ally of the above species has been described and 
figured by Hildebrand (Muller, No. 360).— Perie Bush. 
