330 VERBEN ACEAE. 
PETRAEA. Purple Wreath. 
(Family Verbenaceae). 
Tender twining shrubs: subde- 
ciduous. Stems terete, moderate: 
pith rather small, continuous, 
pale. Buds small, solitary, ses- 
sile, roundish, with 2 scales, or 
an upper bud quickly developing. 
Leaf-scars opposite, half-round or 
shield-shaped, raised:  bundle- 
trace 1, large: stipule-scars lack- 
ing. Leaves, if present, lanceo- 
late, undulate, or somewhat 
toothed above. 
Though its foliage and flowers 
are very different, the purple 
wreath produces something of the 
effect of a wistaria when in bloom, 
the flowers being borne in long 
hanging clusters. In_ tropical 
countries it is frequent as a Cov- 
ering of tree-trunks and hanging 
from the eaves of houses. 
Somewhat pubescent: cortex cracking below. P. volubilis. 
