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436 TETUADTNAMIA. 



Class 15. Tetrachjnamia. Stamens 4 long 

 and 2 short. Orders 2, perfectly natural- 

 Flowers cruclfornu 



1. SiUciilosa. Fruit a roundi^li potl, or pouch. 

 In some genera it is errtire, as Draba, 

 Engl. Bot. t. 5S6, and the Honesty or 

 Satin flower Lunaria i in others notched, 

 as Thlaspi, t. 1659, and J/;cm, t. 52 ; 

 "which last genus is unique in its natural 

 order in having unequal petals. CramhCy 

 ^.924; Isatis, t. 97; and Bimias, t. 231 ; 

 certainly belong to this Order, though- 

 placed by Linnieus in the next. 



2. SiUqiiosai Fruit a xay long pod. Some 

 genera have a califx clausus,. its leaves 

 slightly cohering by their sides, as Kapha- 

 mis, t. 856' ; CheivantJius, t. 462 ; Ilcs- 

 peris, t. 731 ; Brassica^ t^ 637, <^c. 

 Others have a spreading or gaping calyx, 

 2i^Cardamw€yt. 1000; Sisyinhrium, t.S55'r 

 and especially Sinapis, t. 969 and 1. 1677- 



Cleome is a very irregular genus, allied 

 in habit, and even in the number of sta- 

 mens of several species, to the Foli/andria 

 Monogynia. Its fruit, moreover, is a cap- 

 >sule of one cell, not tlie real Iwo-celled 



