On the Leaf-glands of Ipomoea paniculata. 
^ BY 
MARY FRANCES EWART, B.Sc, 
University College , London. 
With Plate IX. 
I N fully developed leaves of Ipomoea paniculata , at the top 
of the petiole immediately below the blade of the leaf, are 
two small depressions, one on either side. Each of these is 
covered with a thin colourless fluid secreted by a gland hidden 
within the tissues of the leaf. If the depressed region be 
examined more closely with a hand-lens, a small papilla is 
seen projecting from the centre ; at the apex of the papilla is 
a wide mouth, from which the secretion of the gland beneath 
is poured over the surrounding concave surface. 
These glands, originally discovered by Mr. Walter Gardiner, 
F.R.S., are altogether peculiar and belong to a type but rarely 
encountered amongst plants. Till the appearance of Macfarlane's 
observations upon the pitcher-plants (to be alluded to here- 
after), there was, so far as I have been able to ascertain, no 
description of glands of the present type in the literature of 
Botany. Adequate living material for an investigation into 
their nature and development was accessible to me in the 
hot-house attached to the Botanical Department of University 
College, and upon this the results here recorded were obtained; 
[Annals of Botany, Vol. IX. No. XXXIV. June, 1895.J 
