PoTAMOGETON CRISPUM. CuRLED toNDWEED* Or 

 GREATER WATER CALTROPS; 



POTAMOGETON Lin. Gen. PL Tetrandria TetragynIa. 



Cal. o. Petala 4. Stylus o. Sent. 4. 

 Rail Syn. Gen. 5. Herbje floRe iMPEkFECTo seu stamineo vel apjttalo 



POTIUS. 



POTAMOGETON crifpum foliis lanceolatis alternis oppofitifve imdulatis ferratis. Lin. Syfl. Vez fi tah" 



p. 141. SfiPL p. 183. Fl.Suec. n. 148; 



POTAMOGETON. Hall. Hijl.n. 848. 



POTAMOGETON <r$>#/£ &#o// F/. Cam. n. 1 li i 



POTAMOGETON foliis crifpis feu la&uca ranarum, ltaz/£. p. 46^ 



POTAMOGETON feu fontinalis crifpa. /. B. III. p. 778. 



TRIBULUS aquaticus minor Quercus floribus. Ger» em. 1282I 



TRIBULUS aquaticus minor prior. Park. .1248. Rail Syn. p. 149. The greater Water Caltrops» 

 Hudjbn Fl. Angl. p. j$. Lightfoot Fl. Scot. p. 122.. 



RADIX perennis, repens. % ROOT perennial and creeping. 



CAULES plurimi, variag longitudinis, fordide carnei, | STALKS numerous, of various lengths, of a dirty flefh* 



fubdiaphani, comprefli, utrinque fulcati, ramofi. ■% colour, fomewhat tranfparent, flattened, with 



I a groove on each fide, and branched. 



VAGINAE breves, concolores, vix difUnguendae. | SHEATHS fhort, of the fame colour as the {talks* 



I fcarcely to be diftinguimecl. 



FOLIA feffilia, lanceolata, obtufa, fubdiaphana, crifpa, | LEAVES feffile, lanceolate* obtufe, fomewhat tranfpa-* 



fcariola, nitida, trinervia, ferrulata, inferiori- % rent, curled, fonorous to the touch, mining, 



bus alternis, fuperioribus oppofitis. I three-ribbed, fharply and finely ferrated, the 



% lower ones alternate, the upper ones oppofite. 



PEDUNCULI axillares, bi feu triunciales, craffiufculi, | GENERAL FLOWER-STALKS growing from the 



fubcompreffi. y alae of the leaves, two or three inches iri 



I • length, thickifh, and fomewhat flattened. 



FLORES fpicati, fex five 06I0, feffiles. | FLOWERS fix or eight, growing in a fpike, and feffile. 



CALYX nullus. ¥ CALYX wanting. 



COROLLA: Petala quatuor, fubrotunda, obtufa, | COROLLA : four Petals, roundim, obtufe, hollow, 



concava, unguiculata, primo ere£ta, dein pa- % connected by a little claw, at firfr. upright, 



tentia, decidua, e fufco viridia, Jig. 1. - 1 afterwards fpreading and deciduous, of a 



$ greenifh brown colour, Jig. 1. 



STAMINA: Fil amenta quatuor, breviffima, vix dif- 1 STAMINA : four Filaments, very fhort, fcarcely to 



tinguenda. Anthers breves, didymae, albas, | be diftinguifhed. Anthers fhort, having 



Jig. 2. f two feparate lobes, of a white colour, Jig. 2. 



PISTILLUM : Germina quatuor, ovato-acuminata. | PISTILLUM : Germina four, ovate, with a long point. 



Stylus nullus. Stigmata obtufa, Jig. 3. f Style none. Stigmata obtufe, Jig. 3. 



SEMINA quatuor, nuda, majufcula, fordide virentia, | SEEDS four, naked;, rather large, of a dirty green, flat- 



utrinque compreffa, externe ad bafin denticu- y tened on each fide, toothed externally at the 



lata, fig. 4. .* bale, Jig. 4. 



Moft of the plants of this genus have creeping roots, which penetrating eafily through the mud, caufe them to 

 fpread very faft, fo as foon to fill up a pond or flow river, if unmolefted. 



We have obferved, that ducks very readily eat not only the feeds, but the leaves of the prefent fpecies, which is 

 one of the moft common. The introduction of water-fowl may therefore probably prevent this fpecies at leaft, and 

 perhaps fome of the others, from increafing too much. 



It flowers in June and July. 



