CHAP. II. 
GLANDS. 
67 
openings corresponding with them, and no doubt forming the 
apparatus by which the water contained in the pitcher is 
secreted. They have been noticed and figured by Meyen, 
but were long before mentioned in this work (1835), and 
have been figured by me in the second volume of Lady^s 
Botany (t. 47.). The opening through the cuticle immedi- 
ately above them shows that they are internal organs ; never- 
theless, Meyen considers them external glands. Internal 
glands are very common in Labiatae. 
Sessile glands, verrucce, or warts, are produced upon various 
parts, and are extremely variable in figure. In Cassias, they 
are seated upon the upper edge of the petiole, and are usually 
cylindrical or conical; in Cruciferous plants they are little 
roundish shining bodies, arising from just below the base of 
the ovary ; in the leafless Acacias they are depressed, with a 
thickened rim, and placed on the upper edge of the phyllo- 
dium ; they are little kidney-shaped bodies upon the petiole 
of the Peach and other drupaceous plants ; and they assume 
many more appearances. They are common upon the petiole, 
as in Passiflora ; they are also found upon the calyx, as in some 
species of Campanula, and at the serratures of the leaves, 
when they are considered. by Roper (De Floribus Balsaminea- 
rum, p. 15.) to be abortive ovules; and they appear upon the 
pericarp and the skin of the seed ; in the latter case they are 
called spongiolce seminales by De Candolle. In figure they 
are round, oblong, or reniform, and occasionally cupulatej 
when they receive the name of glandes d godet (glandulce 
urceolares) from some French writers. Warts are the glandes 
cellulaires of Mirbel ; but they must not be confounded with 
the glandes vasculaires of the same writer, which are not mere 
excrescences of the epidermis, but modifications of well known 
organs. (See Discus, further on.) Of this nature are the 
hypogynous glands of Cruciferous plants aleady referred to. 
Lenticular glands (Lenticelles of De Candolle ; Glandes len~ 
ticulaires of Guettard ;) are brown oval spots found upon the 
bark of many plants, especially willows : they have been 
thought to indicate the points from which roots will appear if 
the branch be placed in circumstances favourable to their 
production, and are considered by De Candolle to bear the 
F 2 
