THE STUDY OF THE SCIENCE OF BOTANY. 
257 
This class contains the clove (Caryophillus aromaticus ), pomegranate 
(Punica nana), almond ( Amygdalus communis ), peach (/f. Persica ), 
nectarine ( A. Persica nectarina), cherry ( Prunus cerasus), plum (P. 
domesticus), medlar {Mespilus Germanica ), apple (Pyrus malus), pear 
(P. communis), quince ( Cydonia vulgaris), andapricot ( Prunus Arme- 
niaca). Orders three, viz. 
Monogynia; Prunus mahaleb. 
Di-Pentagynia; from two to five styles inclusive; Gillenia 
trifoliata. 
Polygynia ; Pubus roscefolia. 
Classis XIII. —PoLYANDRIA. 
Polyandria , from poly, 
many, and aner , a man. 
This class agrees with the 
last in having bisexual flow¬ 
ers, with an indefinite num¬ 
ber of stamens, which neither 
cohere in any part of their 
length, nor are distributed in distinct parcels; but it is distin¬ 
guished by the stamens being inserted distinctly from the floral 
envelopes, immediately under the ovarium, in what has been called 
the receptacle by Linnaeus and his followers, torus by Salisbury, and 
thalamus by other botanists. 
This class consists of the greater part of several extensive orders 
such as Ranunculacece , Magnoliacece, and Cistinece, &c., and, like the 
last, is replete with subjects of interest to gardeners and florists. The 
various kinds of Clematis form the most valuable portion of the hardy 
climbing plants of the verandah. The brilliant varieties of the ranun¬ 
culus and anemone constitute the most attractive part of the flower- 
garden. Poeonia, well known for the richness of its colour, is the 
ornament of every pleasure-ground; and the noble varieties of Mag¬ 
nolia , the pride of the North American forest, are the finest exotics 
of the shrubbery. Anona, or the custard-apple, is one of the most 
important of the fruit-trees of tropical countries; and the celebrated 
water-vine of Sierra Leone is a species of Tetracera. Nor must 
Sarracenia, with its curious pitcher-like leaves; Papaver, from which 
opium is extracted ; Cimicifuga, whence is obtained the antidote to 
the dangerous bite of the rattle-snake ; Pixa , or the annotta tree, from 
the fruit of which the colouring matter for the red cheese of England 
VOL. iv.—NO. XLIX. 
c c 
