This species differs from P. staminea in not having its 
petals rolled back, and in the greater breadth of its leaves; 
from P. integrifolia in having smooth calyces and pedicels ; 
from P. latifolia in the absence of spines from the base of 
the leaves, and in the relative proportion of the bractez 
and pedicels; from P. albiflora in its broader leaves, which 
are woolly beneath, and in the great length of the bractex; 
from P. suaveolens in the presence of down on the under 
side of the leaves, and in the smoothness of the pedicels 
and rachis; and from both the last-mentioned species in 
the colour of the flowers. 
J.L. 
