120 
Tetrudynamia. 
Cardamine Pratensis , Meadow Lady's Smock. 
Cuckow Flower ; pod opening with a spring ; valves 
bent backward, equal to the partition ; stigma entire $ 
cal. slightly gaping ; a single gland on both sides between 
the shorter stamens and the calyx. Spec. char. Leaves 
pinnated ; radical leaflets, roundish, toothed, those on 
the stem lanceolate. Perennial, and common in moist 
pastures,, where it exhibits its fine purple or white 
flowers early in spring. 
Sisymbrium.. Gen. char.-—PoA opening with up- 
right valves ; cal. and cor. spreading. 
Sis. Nasturtium, Water- Cress ; with declining pods, 
pinnated leaves, leaflets heart-shaped, roundish. Corn* 
mon in rivulets and near springs, and well known as one 
of the earliest salads for the table. 
Sis. Monetise, Isle of Man Rocket, or Dwarf Sea 
Rocket ; with erect pods ; pinnatifid leaves, simple, 
naked, smooth stems. This plant is very remarkable for 
its habitat on the western parts of the kingdom. 
Erysimum. Gen. char.- — Pod straight, exactly 
square ; cal. shut ; stigma capitate. 
Er. Officinale, Common Hedge - Mustard ; with pods 
closely pressed on the stem, leaves runcinated. Annual ; 
flowers in June and J uly , and is very common in waste 
p'aces and by way-sides. 
Er. Barb area. Yellow Rocket, or Ritter Winter 
Cress ; with inferior leaves lyre-shaped, terminal lobe 
round, upper leaves ob.ovate, toothed. Perennial ; 
flowers during the summer months, and is common in 
waste places, by river sides, and hedges, and cultivated 
in the flower-sarden with double flowers. 
