126 PHARMACEUTICAL BOTANY 
bium vulgare). They may be simple as in Cotton, etc., or 
branched as in Hyoscyamus muticus. 
Nonglandular hairs are said to be uniseriate when they consist 
of a single row of cells, as those of Digitalis or Stramonium, etc., 
wd, YgX> 
Fic. 67. Fic. 68. 
Fic. 67.—1, Epidermis of oak leaf; 2, epidermis of Iris leaf, both viewed from 
the surface; 3, group of cells from petal of Viola tricolor, showing conical papille; 
4, two epidermal cells in cross-section showing thickened outer wall differentiated 
into three layers, namely, an outer cuticle, cutinized layer (shaded), and an inner 
cellulose layer; 5 and 6, epidermal outgrowths in the form of scales and hairs. 
(1, 2, 6 after Stevens, 3 after Strasburger, 4 after Sachs, and 5 after de Bary.) 
Fic. 68.—Different forms of epidermal outgrowths. 1, Hooked hair from 
Phaseolus multiflorus; 2, climbing hair from stem of Humulus Lupulus; 3, rod-like wax 
coating from the stem of Saccharum officinarum; 4, climbing hair of Loasa hispida; 5, 
stinging hair of Urtica urens. (Fig. 3. after de Bary; the remainder from Haberlandt.) 
multiseriate, when they consist of two or more rows of cells, as 
those of the corolla of Calendula. 
The glandular hairs comprise those whose terminal cell or 
cells are modified into a more or less globular gland for gummy, 
resinous or oily deposits. They are generally composed of a 
stalk and a head region although rarely the stalk may be absent. 
The stalk may be unicellular, bicellular, uniseriate (consisting 
of a single series of superimposed cells) or multiseriate (consisting 
