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THE STUDY OF THE SCIENCE OF BOTANY. 
Classis II— Diandria. 
Diandria, from dis, two, and 
aner, a man ; signifying that this 
class is furnished with bisexual 
flowers, of two husbands, or two 
stamens. 
This class, which is not large, 
and so entirely artificial, that no “ 
other characters than those of the human definition can be assigned 
to it, contains some elegant and fragrant plants belonging to Jas¬ 
mines, Scrophularinece, and Labiats. Examples of the two latter 
orders are Veronica and Salvia, extensive genera, chiefly of hardy 
herbaceous plants. The most useful of this class are, the pepper 
(Piper nigrum), and the olive (Olea) ; the jasmine is used in per¬ 
fumery ; the sage ( Salvia officinalis ), and rosemary ( Rosmarinus 
officinalis), in cookery ; and the privet ( Ligustrum vulgare), and 
syringa, for garden hedges. Orders three, viz. 
Monogynia ; Salvia fulgens. 
Digynia; Anthoxanthum odoratum. 
Trigynia ; tris, three, and gyne, a woman ; flowers furnished 
with three styles ; Peperomia blanda. 
Classis III.— Triandria. - 
Triandria, from tris, three, 
and aner, a man ; meaning that 
this class bears bisexual flowers, 
furnished with three husbands, 
i.e. three stamens, or male organs 
for generation. 
This class, which is larger than 
the two preceding, contains most 
of the genera of three considerable and very natural orders; the 
Irideee, Cyperacece, and Graminece. The first are chiefly bulbous- 
rooted, sword-leaved plants, with brilliant, but transient flowers ; the 
second sedgy, grass-like plants, more curious than useful ; and the 
third, the proper grasses, an order which contributes more extensively 
and effectually to the support of man and domestic animals than any 
other, and, unless we except Lolium temulentum, containing no poison¬ 
ous plant. Orders three, viz. 
Monogynia ; Commelina tuberosa. 
Digynia ; Stipa pennata. 
Trigynia ; Lechea major. 
