TETRADYNAMIA SILICULOSA, 14^ 
Rjuderale, Narrow leaved wild Crefs or DittanderWith. 
apetalous llowtrs that have two'ftamina, whofe leaves 
towards the root are dentato-pinnated, thofe on the bran* 
ches linear and entire* At Malden in EJfeXy Lynne in 
Norfolk^ iitid L ruro in Cornwal. An, June, 
. Petrieum, Mountain Bittander with entire pinnate 
leaves^ emarginated petals that are lefs than the cup. 
On St Vincenfs Rock : R. Sy. An, Aprils May, 
T HL A S P I. Mithridate or Tr. eagle Mustard. 
The cup is tetraphyllous, the leaves are ovate, con- 
cave, eredto- patent, and deciduous. The flower is tetra- 
petaious and cruciform, the petals obovate, twice as 
long as the cup with narrow ungues. There arc fix fila- 
ments, fliorter by half than the corolla ^nd two of thefe 
are fhorter than the reft with acuminated antherte. The 
germen is roundifli, comprefled, emarginated. I'he ftyie 
is fimple and the length of the ftamina, and the itigma 
is obtufe. The filicula is compreff^d, obcordate, emarr 
ginated ; the ftyie is the length of the emargination, bi- 
locular, and the dilTepimentum is lanceolaced, and th^ 
valves navicular, containing many nutant feeds affixed 
to the future. , 
Obf. Burf^ pajloris L, Silicula is obcordate and with- 
out a margin. 
Lhlafpi L Silicula is obcordate with an acute margin, 
Campeftre, Mithridate Mtijiard or Bajiard Crefs with 
roundifh filiculae, fagittated, dentated and hoary leaves. 
In fields and fandy ground. An. 
Arvenfe. Lreacle Muftard or Penny Crefs with orbicu- 
lated filiXulse, oblong, dentated, fmooth leaves. In fields 
but not common. An. June,, July. 
Perfoliatum. Perfoliate L reacle Muftard with roundifli 
filiculce, cordate, partly ferrated leaves furrounding the 
ftalks. in mountainous paftures. Amongtht Stone-pits, 
between Whitney and Bur ford, Oxf, On moift limeftone 
paftures \nTorkfh, M'^eft. mdi Cumh. An. June, 
Hirtum, 
