CHAP. II 
GLANDS. 
65 
Stalked glands [Jig. \6.'a, Z>, c, d,f, h, z, I, m,n,) are elevated 
on a stalk which is either simple or branched : they secrete 
some peculiar matter at their extremities, and are often con- 
founded with the glandular hairs above described, from which 
they have been well distinguished by Link. According to 
that botanist, they are either simple {Jig. 16. «, b, tZ, g, 7i, 7,) or 
compound (c, f, I, m ) ; the former consisting of a single 
cell, and placed upon a hair acting as a simple conduit, oc- 
casionally interrupted by divisions ; the latter consisting of 
several cells, and seated upon a stalk containing one or more 
conduits, formed by rows of cellular tissue. They are com- 
mon upon the rose and the bramble, in which they become 
very rigid, and assume the nature of aculei. For the sake of 
distinguishing them from the latter, they have been called 
setce by Woods and myself, but improperly ; they are also the 
aiguillons of the French. In Hypericum they abound on the 
calyx and corolla of some species, but do not give out any 
exudation; they contain, however, a deep red juice within 
their cells. In some Jatrophas they are much branched ; in 
many Rutaceae they form a curious humid appendage at the 
apex of the stamens. Lately the glandular apparatus of 
plants has received the attention of Meyen, who has pub- 
lished on the subject an elaborate paper, from which the fore- 
going figures are taken. He admits the distinction of simple 
and compound glands, and regards them both as unquestion- 
able organs of secretion. To some of the former he assigns 
occasionally more cells than one in the gland that terminates 
them ; but the hair to which they belong is always simple. 
Of the compound glands some are hollow, others solid. They 
both vary exceedingly in form. Of the above figures the 
following brief descriptions will serve to illustrate the subject 
sufficiently for an introductory work: — 
Simple Glands: — a, a simple stalked gland, from the outside 
of the flower of Sinningia barbata ; it consists of a cylindrical 
cell springing from the epidermis, then of two smaller cells, 
and finally of a fourth, which is the gland ; is a gland com- 
posed of six cells, of which the two lower are small, cylindrical, 
and colourless, forming a stalk, the four upper spherical, 
larger, and filled with secreted matter ; d, simple pestle-shaped 
F 
