Sisymbrium sylvestre. Creeping Water-Rocket. 



SISYMBRIUM LinnaL Gen. Plant, Tetradynamia Siliquosa. 



Siliqua dehifcens valvulis rectiufculis. Cal. patens* Cor. patens, 



Kail. Syn. Gen. 21. Herbje Tetrapetal^e SiliquosjE et Siliculosve. 

 SISYMBRIUM fylveftre filiquis declinatis oblongo-ovatis, foliolis lanceolatis ferratis. Lin. Syfi< 



vegetal, p. 497. 

 SISYMBRIUM foliis pinnatis, pinnis dentatis difiitis Holler. Hijl. ». 485. 

 SISYMBRIUM Roripa \ Scopoli FL Carniol. p. 823* 



SISYMBRIUM paluflre repens Nafturtii folio. Toumefort plant autour de Paris p. ^j, 

 ERUCA fylveftris minor luteo parvoque flore Bauhin pin. 98* 

 ERUCA quibufdam fylveitris repens, flofculo luteo Bauh. Hlft. 2 p. 866. 



ERUCA aquatica Ger. emac. 248. Park. 1242. Rail. Syn. 297. Water-Rocket, Rail. Hijl. p. 808, 

 Hudfon. PL Angl. ed. 2. p. 296. 

 Lightfioot PL Scot p. 351. 



RADIX perennis, albida, tenuis, infignitef repens, J 

 plurimis germinibus tuberculofa. | 



t 



CAULES plunmi, pedales, fuberedti, debiles, inter- | 

 dum purpurafeentes, glabri, angulato-ftriati, f 

 ramofi, ramis hirfutulis. ? 



FOLIA radicalia pinnatiflda, pinnis fubovatis, denta- 

 to-ferratis, laevia, petiolo purpurafcente, cau- 

 lina alterna, fubpinnatifida, pinnis lanceo- 

 latis, ferratis, integrifve. 



PETIOLUS fuperne canaliculars. 



FLORES parvi, lutei. 



PEDUNCULUS communis multiflorus, flexuofus, 

 Pedunculi proprii alterni, patentes, aut furfum 

 paululum curvati, filiqua plerumque longi- 

 ores. 



CALYX: Periantium tretraphyllum, foliolis ovatis, | 

 concavis, erectis, aequalibus, flavefcentibus, f 



fig- !• I 



COROLLA : Petal a quatuor, unguiculata, obtufa, | 



patentia, calyce paulo longiora, Jig. 2. % 



NECTARIUM: Glandulae quatuor, faturate virides, | 

 in circulum coadunatas. 



STAMINA: Filament fex, quorum duo breviora, | 



fubulata, flava ; Anthers incUmbentes, % 



fig- 3- I 



% 



PISTILLUM : Ger men oblongum, teres, longitudine * 



framinum,^-. 5, Stylus breviffimus; Stig- ^ 



ma capitatum, villofum. Jig. 4. ¥ 



PERICARPIUM: Siliqua brevis, vix femuncialis, | 

 teres, furfum curvata, plerumque abortiva. ¥ 



ROOT perennial^ whitim, {lender, remarkably cree- 

 ping, thickly befet with germs which give 

 it a knobbed appearance. 



STALKS numerous, ^ a foot high, nearly upright, 

 weak, fometimes purplifh, fmooth^ fomewhat 

 angular and finely grooved, branched, the 

 branches very flightly hairy. 



LEAVES next the root pinnatirld, the pinnse or fmall 

 leaves fomewhat oval, toothed or fawed, and 

 fmooth, the leaf ftalk purpliih, leaves on the 

 ftalk alternate, ferrated or entire. 



FLOWER-STALK hollowed above. 



FLOWERS fmall and yellow. 



FLOWER-STALK : the general flower-ftalk bent in 

 and out and fupporting many flowers, the 

 partial ones alternate, fpreading almoft ho- 

 rizontally, or bent a little upwards, generally 

 longer than the pod. 



CALYX: a Perianthium of four leaves, which are 

 oval, hollow, upright, equal and yellowim. 

 fig- i- 



COROLLA: four Petals each having a claw, and 

 blunt, at the point, fpreading and a little 

 longer than the calyx, fig. %. 



NECTARY : four glands, of a deep green colour, 

 united in a circle. 



STAMINA : fix filaments, two of which are fhorter 

 than the others, tapering, and yellow, An- 

 thers laying acrofs the Filaments, fig. 3. 



PISTILLUM: Germen oblong, round, the length 



of the ftamina fig. 5, Style very fhort ; 



Stigma forming a little head and villous. 



fig- 4. 

 SEED-VESSEL a fhort Pod, fcarce half an inch 



long, round, bending upwards, generally 



abortive, fig. 6» 



rOliRNEFORl m his Hi/lo;re des Plantes des environs de Paris, has defcribed our plant with much accuracy 

 it appears from his account to be plentifull not only along the banks of the Seine, but in the the courts before 

 Houfes, and in moft moift fituations, it is alfo defcribed by Ray, in his Hfi. Plant ; with us it is not of fuch 

 general growth butin thofe fituations in which it does occur we find it in great abundance ; the watery part of 

 lotbill Fields Wejlminfier is over run with it ; I fcarcely know any plant that requires to be introduced into a Gar- 

 den with more caution than this* efpecially if the ground be moift. 



It continues to flower from June to September. Both Ray and Tournefort mention the feeds of this plant 

 it is probable they found it growing in a dry fituation favourable to their ripening, the feed veflells which I have 

 had an opportunity of feeing have all proved abortive, which I fufpect is natural to the plant as it encreafes fo 

 connderably by its root; 



This plant affords no ftriking generic chara&er, but may be referred to almoft any Genus in the Order. 



