PETRAEA VOLUBILIS 
Petraea, or sometimes Petrea — after Lord Petre. ( 1710 — 1742 ), an 
English patron of botanj and horticulture; volubilis — twining. 
Petraea; Purple Wreath. 
Verbenaceae. 
Tropical America, 
lilac and blue. 
a rather large, woody scram- 
bler and twiner, suitable for 
growing as a bush in the open, 
or on a pergola or a tree. 
The hanging spikes of lilac 
and blue flowers are most 
attractive. 
by cuttings or by layering or 
from suckers from the base of 
old plants. 
A, flower from the front, showing the blue 
corolla surrounded by the large, lilac 
coloured calyx lobes which persist and 
enlarge at fruiting. 
B, base of corolla tube cut open to show one of 
the two pairs of stamens, the ovary and the 
style. 
C, ovary cut open lengthwise to show the two 
celb -Tl with one ovule. 
English names : 
Countrj/ of origin : 
Colour : 
Garden use; 
Propagation : 
