SONCHUS ARVENSISi GoRN SoW-THISTLB. 



SONCHUS Lin. Gen. PL Syngenesia Polygamia ^Equalis. 



Recept. nudum. Gal. imbricatu's, ventricofiis. Pappus pilofus» 



RaiiSyn. Gen. 5. Herb^: flore composito naturA pleno lactescentes. 



SONCHUS arvenfis pedunculis calycibufque hifpidis fubumbellatis, foliis runcmatis bafi cordatig. Um 

 Syfi. Vegetdb. p. 594. Spec. PI. 1116. Fl. Suec. n. 687. 



SONCHUS foliis amplexieaulibiis femipinnatis ferratis, calycibuS hifpidis. Hafler. Hifi. ip 



HIERACIUM arvenfe. Scopoli Fl. Carn'wh m 974. 



HIERACIUM majus folio fonchi. Bauhin. Pin. 126. 



SONCHUS repens multis Hieracium majus. Baub: Hifi. 2. 170. 



SONCHUS arborefcens. Ger. emac. 294. Rati Syn. p. 163. Tree Sow-thifile; Hudfoti Fl. Angl ed. 2» 

 p. 23J' Lightfioot FL Scot. 427. 



RADIX perennis, la&iflua, longe, lateque repens, difficulter | ROOT perennial, milky, creeping far and wide^ with 



eruta. | difficulty eradicated. 



CAULIS bi feu tripedalis et ultra, ere&us, fiftulofus, t STALK from two to three-feet high, or more, upright, 

 la&efcens, fubangulatus, lasvis, inferne faspe| hollow, milky, fomewhat angular, fmooth, 



purpureus, fuperne ramofus. $ often purple below, above branched. 



FOLIA alterna, runcinata, bafi cordata, amplexicaulia, | LEAVES alternate, like thofe of Dandelion, heart Jhaped 

 lasvia, nitidula, fubtus pallidiora, fpinis molli- % at the bafe, embracing the ftalk, fmooth, 



cellis circa margines donata. | mining, paler on the under fide, the edges 



y furnifhed with foftifh prickles. 



FLORES fubumbellati, magni, lutei. ? FLOWERS growing in a kind of Umbel, large and 



I yellow. 



PEDUNCULI longi, teretes, pilis longis luteis, globu- % FLOWER-STALKS long, round, covered with long, 

 ligeris veiiiti. | yellow, hairs, bearing globules at their extr^» 



% mity. 



CALYX communis priufquam flofculi expanduntur | CALYX common to all the florets, before their expan- 

 cylindricus, apice truncatus, poftea ventricofo- 1 lion, cylindrical and cut off at the extre- 



conicus, fquamis plurimis, eredis, inasquali- 1 mity, afterwards bellying at the bafe and coni- 



bus, carinatis, fordide viridibus, hirfuti]fimis,\ cal, the fcales numerous, upright, unequal, 



pilis ficut in pedunculis. % keeled, of a dirty green colour, and extremely 



J hairy, the hairs fimilar to thofe on the foot- 



% ftalks. 



COROLLA compofita, imbricata, Corollulis hermaphro- 1 COROLLA compound and imbricated, the Florets her- 



ditis, numerous, asqualibus. ^ maphrodite, numerous and equal. 



Propria monopetala, tubus albus, tenuis, fuperne pilo-tEacb Floret monopetalous, the tube white, {lender, 

 fus, limbus luteus, longitudine fere tubi mar- 1 hairy above, the flat part yellow, almoft the 



ginibus faepe fubinvolutis, quinquedentatus. % length of the tube, the edges frequently rolled 



fig- 1. I inward, furnimed with five teeth, fig. 1, 



ANTHERiE in tubum flavum, fubangulatum, coalite. % ANTHERiE united into a yellow, and fomewhat angu- 



| lar tube. 



STIGMATA duo, filiformia, reflexa. | STIGMATA two, thread-fhaped, reflexed. 



SEMEN ovato-oblongum, badium, fulcatum, angulis ad | SEED of an oblong egg-fhape, bay colour, and grooved, 

 lentem tranfverfim rugofis, pappofum, pappo| the angles tranfverfely wrinkled when magni- 



fimplici, feffili. fig. 2. t fled, downy, the down fimple, and feffile. 



? fig- 2. 



This fpecies of Sonchus is properly termed arvenfis, being commonly found in corn fields, in which its large 

 yellow blofloms, towering above the corn, render it a very confpicuous plant ; thefe alone are fufficient to diftinguifn 

 it from the common Sow-thifHe, it has befides two other very diftinct characters ; the one a creeping root, whereby 

 it becomes very noxious to the hufbandman ; the other, numerous yellow hairs, with little globules at their 

 extremities, thick fpread over the calyces and flower-ftalks. 



It bloffoms in July and Augufi ; many of its feeds prove abortive. 



