Widens cernua. Nodding Water-hemp -Agrimony. 



BIDENS Lin. Gen. PI. Syngenesia Polygamia ^Squalis. Recepf. paleaceum. Pappus ariftis ereclis 



fcabris. Cal. imhricatus. Cor. rarius ilofculo uno alterne radiante inftructus. 



■Rail Syn. Gen. 8. Herbje flore composito discoide seminibus pappo destitutis 



CORYMBIFER.E DICT,E. 



BIDENS cernua foliis lanceolatis amptexicaulibus floribus cernuis feminibus ereftis. Lin. Syfi. Fegetab. 

 p. 610. 



BIDENS foliis feflilibus ferratis, floribus nutantibus circumvallatis, Haller. FUJI. 120. 



BIDENS cernua ScopoIiFI. Carniol. p. 176. n. 2. 



CANNABINA aquatica folio non divifo. Bauh. pin. 321. 



VERBESINA pulcbriore flore luteo. /. B. II. 1074. 



EUPATORIyE Cannabinae fasminas varietas altera Ger. emac. 711. 



EUPATORIUM aquaticum folio integro. Parkins. 596. 



VERBESINA minima. Dillen. Cat. Gifs. 167. et App. 66. Rail Syn. ed 3. /. y.f 2. 



Raii, Syn. p. 187. Water-Hemp- Agrimony with an undivided leaf. 

 Hudfon. FI. Angl. ed.z. p. %$(*. 

 Lightfoot. FI. Scot. p. 463. 



RADIX annua, fibrofa, fibris plurimis, majufculis, 4 

 alte defcendentibus. | 



CAULIS pedalis, bipedalis, et ultra, erectus, ramofus, | 

 hifpidulus, purpurafcens, rubro pun&atus, I 

 inferne teres, fuperne fulcato-ftriatus, rami -| 

 oppofiti, fubere&i. £ 



FOLIA oppofita, indivifa, modice connata, ovato- | 

 lanceolata, patentia, ierrata, utrinque lasvia. f 



ysjr. 



PEDUNCULI ftriati. 



FLORES e luteo virefcentes, dernum cernui., plerumque 



radiati. 

 CALYX communis, foliaceus, foliolis circiter feptem, 



lineari-lanceolatis, ferrulatis, nervofis, reflexis, 



corolla longioribus. 



COROLLA": Petala exteriora decern circiter, oblongo- 

 ovata, acutiufcula, nitida, e flavo-virelcentia, 

 apice inflexa, lineis parallelis nigricantibus 

 picla, exempta margine ; Flosculi in difco 

 numeroii, aequales, hermaphroditi, infundi- 

 buliformes, flavi ; T«#«jcylindraceus, longi- 

 tudine limbi feu paulo longior, Limbus cam- 

 panulatus, quinquedentatus, dentibus fub- 

 fubreliexis. fig. 1. 2. 



STAMINA : Filament a quinque, capillaria; An- 

 thes£ nigricantes, in tubum laxum coali- 

 te- fig- 3- 



PISTILLUM : Germen angulatum, fubconicum, albi- 

 dum, apice truncatum, fuperne e quatuor 

 angulis, ariftis quatuor longitudine fere flof- 

 culi inftructum. fig. 6. 



SEMEN olivaceo- nigrum, obverfe conicum, tetrago- 



num, angulis ariftifque retrorfum fcabro ha-; 



moiis. fig. 7. 

 RECEPT ACULUM paleaceum Paleis ftrufturae petalo- 



rum, ' lanceolatis, longitudine flofculorum. 



A- 5- 



THE Genus Bidens of Linn^us is chiefly characteriz'd by the ftucture of its feeds, which according to its 

 name fhou'd be furnimed with two teeth or awns, to neither of our Englifh fpecies does this name however 

 well accord, as the one has generally three and the other four ; the awns are furnifh'd with fmall fharp hooks, 

 (a curious objeft for the microfcope) by means of which they often ftick to ones cloaths, and Mr. Light- 

 foot mentions that they have been known fometimes to deftroy the Cyprinus auratus or Gold Fifh by adhering 

 to their Gills and Jaws. 



We have two fpecies of Bidens common in this country viz the tripartita and cernua, the tripartita is common 

 on the edge of almoft every pond, the cernua delights rather to grow in the water itfelf, in the ditches about St. 

 Georges Fields, in the pond adjoining Horn fey Wood, and in fimilar fituations about London it is very frequently 

 met with, it flowers in the month of September, a month later than the tripartita. 



Like all other plants it is fubject to vary, being fometimes found without its exterior petals, and fometimes in 

 very drys feafons when the Sun has exhaled the water from the pond it has grown in, it has been found fo 

 dwarfifh as not to exceed two or three inches in height, a plant of this kind is figured on the plate, fig. 8, Dillenius 

 finding it in this ftate, defcribed and figured it is in his edition of Rays Synopfis, as a diftinct fpecies and Linnae- 

 us probably relying on his authority adopted it as fuch in his Species plant arum but Haller whohad feen the Plant 

 very juftly confiders it as only a variety and Mr. Lightfoot concurs with him in opinion, Mr. Hudson with his 

 ufual inaccuracy in the fecond edition of his Flora anglica gives it as a variety of the tripartita. 



The flowers of this fpecies have a ftrong and not a very difagreeable fmell, hence they promife to poffefs fome 

 medicinal powers, it is faid by Linnaeus, to dye yellow, but not fo powerfully as the tripartita. 



ROOT annual, and fibrous, the fibres numerous, large, 

 branched, running deep. 



STALK from one to two feet high or more, upright, 

 branched, fomewhat hifpid, purplifh, dotted 

 with red, below round, above ftriated, the 

 branches oppofite and nearly upright. 



LEAVES oppolite, undivided, moderately connate, 

 ovato-lanceolate, fpreading, ferrated, and 

 fmooth on both fides. 



FLOWER-STALKS ftriated. 



FLOWERS of a yellowifh green colour, finally 

 drooping, generally radiated. 



CALYX common to all the florets leafy, confiding of 

 about feven leaves, which are of a fhape be- 

 twixt linear and lanceolate, finely fawed at the 

 edge, rib'd, turning back and longer than 

 the corolla. 



COROLLA : the exterior Petals about ten. in num- 

 ber, of an oblong oval fhape, fomewhat point- 

 ed, and bending in at the top, of a yellowifh 

 green colour, fhining and marked with blackifh 

 parallel lines except the margin, the Flowers 

 in the center numerous, aequal, hermaphro- 

 dite, funnel fhaped and of a yellow colour ; 

 the 'Tube cylindrical the length of the limb or 

 a little longer, the Limb bell- fhaped, having 

 five teeth which turn fomewhat back. fig. 1.2. 



STAMINA: five Filaments, very fine ; Antherje 

 blackifh, forming a loofe tube. fig. 3. 



PISTILLUM : Germen angular, fomewhat conical, 

 whitifh, cut off at top, furnifhed above with, 

 four beards or awns proceeding from the four 

 angles almoft the length of the flow T er and 

 befet withlittlehooks bending backward,^g\6. 



SEED of a dark olive colour, inversely conical, four 

 cornered, the corners and beards befet with 

 little hooks bending backward, fig. 7. 



RECEPTACLE chaffy or ' befet with numerous lan- 

 ceolate leaves having the ftructure of the petals 

 and being as long as the florets, fig. 5. 



