'Sisymbrium terrestre. AnnualWater-Radish 
SISYMBRIUM Liti. Gtn. Pl. Tetkadynamia siliotosa. 
Siliqua dehifcens, valvulis reftiufculis. Cat. patens. Corolla patens. 
RaiiSyn. Gen. Herb;e tetrapetalje siliquos^ et siliculos^. 
SISYMBRIUM terrejlre radice annua, foliis pinnatifidis dentato-ferratis, filiquis foecundis. 
RADIX annua, fibrofa, albida. 
CAULIS pedalis, fefquipedalis, et ultra, plerumque 
ere&us, ramolus, fulcatus, laevis, viridis, leu 
purpurafcens. 
FOLIA omnia pinnatifida, Eryfimi officinalis quodam- 
modo fimilia, lasvia, pinnis trium, quatuor, 
live fex parium, cum impari, omnibus inae- 
qualiter dentato ferratis, extima prefertim in 
inferioribus foliis rotundata ; caulina femiam- 
plexicaulia. 
FLORES minimi, lutei, femper foecundi. 
CALYX: Periantiiium tetraphyllurp, foliolis ovatis. 
obtufis, concavis, fubere&is, flavefcentibus. 
Jig . i. audt. 
COROLLA; Petala quatuor, lutea, fiepius emargi 
nata, vix longitudine calycis, yig. 2. 
STAMINA: Filamenta fex, fubaequalia, longitudine 
piftilli, flavefcentia. Anthers luteae, in 
cumbentes. Jig. 3. 
PISTILLUM : Germen oblongum. Stylus brevifli- 
mus. Stigma capitatum, villofum. Jig. 4. 
PERICARPIUM: Siliqua teres, longitudine pedum 
culi, furfum fubarcuata, feminibus plurimis 
haud aequaliter protuberantibus turgida. Jig. 
5 . 6 . 
SEMINA minima, fufca, Jig. 7. 
^ROOT annual, fibrous and whitiffi. 
t STALK a foot, a foot and a half, or more, in height, 
generally upright, branched, grooved, fmooth, 
¥ of a green or purplilh colour. 
I LEAVES, all of them pinnatifid, lomewhat like thofe 
I of Hedge-muftard, fmooth, the pinna confift 
? of three, four, or fix pair, with an odd one, 
I all of them unequally indented, the outermoft 
efpecially in the bottom leaves roundifh, thofe 
I of the ftalk partly amplexicaule. 
f FLOWERS very fmall, yellow, and always producing 
I feed. 
I CALYX: a Perianthium of four leaves, which are 
ovate, obtufe; hollow, nearly upright, and yel- 
| lowilh. Jig. 1 . magn. 
? COROLLA : four Petals, of a yellow colour, gene- 
| rally nicked at the end, fcarcely the length 
of the calyx. Jig. 2. 
I STAMINA: fix Filaments, nearly equal, the length 
I of the piftillum, of a yellowilh colour. An- 
I ther.® yellow and incumbent. Jig. 3. 
£• PISTILLUM: Germen oblong. Style very Ihortr. 
t Stigma forming a little head and villous. 
I Jig. 4. 
t SEED-VESSEL a round Pod, the length of theflower- 
| ftalk, fomewhat curved upward, turgid with 
$ numerous feeds which protuberate unequally. 
I fig. St 6- 
I SEEDS very fmall and brown. Jig. 7. 
We have taken the name of terrejlre , which Linnaeus applies to the third variety of his Sifymbrium amphibium. , 
not lb much from the certainty of its being the plant he intends, as from the propriety of its application to this 
fpecies, it being generally found in dryer fituations than the true amphibium. 
Repeated obfervation and culture have thoroughly fatisfied us that the prefent plant is a fpecies perfectly diftinft 
from the amphibium ; and we ground our authority for confidering it as fuchon the following circumftances. 
1 ft, It is an annual, whereas the amphibium is not only a perennial, but has a creeping root. 
adly, It is a much fmaller plant than the amphibium , feldom acquiring half its height. 
gdly, It is feldom or never found in the water, unlefs accidentally overflown. 
4thly, Its foliage is very different, the radical leaves much refembling thofe of the Eryjimum officinale. 
And, laftly, its feed-veflels are always turgid, and full of feeds, while thofe of the amphibium areufually abortive. 
As we can find no fatisfadtory account of this plant either in Ray, Hudson, Linnaeus, Haller, or the 
numerous authors we have confulted, we have omitted all lynonyms, and contented ourfelves with giving it a new 
fpecific character, chiefly intended to contraft it with the amphibium. 
In the courfe of our botanical. refearches we have had frequent occafion to remark, that our moft common plants 
are the leaft known ; we feek with avidity fuch as are rare and with difficulty acquired, and negledt thofe that we 
daily tread under foot. The prefent plant affords an inftance of this inattention, as it is a very common one in the 
environs of London , and found in the fame fituations as the Rumex maritimus , on the edges of wet ditches, and on 
ground apt to be occafionally overflown. We have obfcrved it in Tothill- Fields , on the edge of a ditch by the road- 
fide leading from the Magdalen Hofpital to Lambeth Marjh, and in our garden it comes up fpontaneoufly as a 
common weed. 
When this plant grows by itfelf, in a fituation tolerably dry, it grows quite ere£t, and quickly produces a 
confiderable quantity of feeds. Should it happen to be overflown, which is frequently the cafe, it is then more 
procumbent, and will fometimes take root at the joints, in which ftate it appears to be the Sifymbrium palujlre repens 
parvo flore of Vaillant, at leaft it accords in part. 
This fpecies of Silymbrium flowers in June, July , Augufl , and September. 
It has a limilar tafte to moft of the plants of the crefs kind, but is not very pungent. 
