TETR ADYNAMIA. 
115 
Pistillum. Germen above, increasing daily in hight. Style, 
either the length of the longer stamina, or none. Stigma 
obtuse. t 
Pericarpium. A siliqua (pod) with two valves, often with 
two cells, opening from the base to the top ; the dis¬ 
sepiment (partition) often projecting at the top beyond 
the valves; which projection had before served as a style. 
The siliqua is distinguished into siliquosa and siliculosa 
(long and short pods) which gives rise to the orders. 
Semina. In general many, roundish, lodged in the disse¬ 
piment (which runs lengthways) and alternately on each 
side: the receptacle linear, surrounding the dissepiment, 
and immersed in the sutures of the pericarpium. 
This class contains two orders.* 
ORDER I. SILIQUOSA.+ 
(a silique.) 
Meaning such plants whose pericarpium , according to the distinction of Linnaeus, 
is a long siliqua , 
N° of Species in 
N° Genera. Growth. Species. Native of Britain. 
1st. Calyx closed with leaflets longitudinally converging. 
1 Arabis h II Alps, Canada Brit. 3 
2 BrassicaJ h 14 Alps, China Brit. 5 
* In the Gen. Plan . siliculosa is the first order, and siliquosa the second order; 
but in the Fragments of a Natural Method , under the order siliquosce , the siliqua 
is the first section, and silicula the second section, which method (as it seems 
more regular) .1 have here adopted. 
f This order admits of a few exceptions as to the long form of the seed-vessel, 
as in bunias, isatis , and especially in crambe , which hath a round pod, one cell, 
and a single seed. 
+ Brassica (cabbage) greatly abounds in varieties, as brocoli , caulijtovjcr , &c. 
And as the surface of the leaves of the family of cabbage are highly polished, there 
is no attraction between them and dew drops, hence the drop does not come into 
contact with the leaf, but hangs over it repelled, and retains its natural form, com¬ 
posed of attraction and pressure of its own parts, and thence looks like quicksilver: 
one advantage from which is, that the leaf not being moistened, is less injured by 
frost, and another may be that respiration is less incommoded. Botanic Garden . 
