FOIJMS AND DISTRIBUTION OF BATRACHIUM. 103 



Africa (Dix'ge ! 7(306, Cooper, 731), Boston, U.S., and is in all proba- 

 bility widely distributed. Differs from Dronetii by its larger size with 

 bigger flowers, and more elongated submersed leaves, occupying an inter- 

 mediate position between the latter and pseudojlnltaus. 



31. PSEUDOFLUITANS. 



R. heteropJiyllus, Bab. part (1855) ex Syme. Balracliium aqvatile, 

 h. riv/dare, Sciiur. Enum. Plant. Transsilv. p. 11 (1866). Ji. peltatus, 

 y. pseudojluitatis (irapropr. " R. pseudo-JinUans, New'bould, ras."), Syme, 

 Eng. Bot. ed. 3. vol. i. p. 20, part (1863). R. pseudojluitans, Bab. 

 (impr. Newb.) Man. Brit. Bot. ed. 6. p. 7, majore parte (1867). 



(Occurs in England and Thibet (T. Thomson! 14,500 ft. alt.), and 

 probably in many countries of Europe, specimens of it being frequently 

 called R. fluitans, Lam., which it approaches very closely. Generally, 

 however, it differs from Jluitans by more slender leaf-segments, and espe- 

 cially by its hairy not glabrescent fruit receptacle. It differs from penicil- 

 latits, from which Mr. Syme and Professor Babington have not distin- 

 guished it, by the absence of floating leaves, and usually by a different 

 habit. 



32. sphjKROSpermus. 



R. sphcerospermus, Boiss. et Blanche in Boiss. Diagn. ser. i. vol. v. 

 p. 6 (1856). R. aquatilis, y. sphcerospermus, Boiss. El. Orient, p. 23 

 (1867). 



Occurs in Syria (near Damascus, Gaillardot !, state with carpel-heads 

 ovoid). A plant gathered by Dr. Schlafli ! n. 34, from the Euphrates is 

 best referred here ; also a plant gathered in Warwickshire by Dr. Kirk ! 

 This form bears a general resemblance to trichophyllHS, but the stem is 

 more succulent, the flowers are larger, and on longer and thicker peduncles, 

 and the carpels more numerous. It also bears some resemblance to 

 pseudojluitans. 



33. SALSUGINOSUS. 



.Batrachium salsuffinosum, Duniort. Monogr. Batr. p. 14 (1863) (non 

 R. salsnginosus, Pall., nee Wall. List. 4708). 



Occurs in Sweden, Scotland, England, Belgium, France,. Greece, 

 Palestine, etc. Differs from conftisus by the absence of ffoating leaves. 



34. MARINCS. 



R. maririus, Arrh. and Pr. in Fr. Mant. iii. p. 52 (1842). BatracMuvi 

 marinum, Fr. I.e. p. 51 (1842) ; Herb. Norm ! fasc. 9. n. 28 (specimen). 



Occurs in Norway, Sweden, Denmark, Finland, West Russia (Herb. Fl. 

 Ingric. Cent. viii. n. 12 !), Scotland, England, Ireland, France, etc. A 

 curious state, best referred to this form, occurs in England (N. Devon !) 

 and Sweden ! with elongated, rather stout, and subparallcl leaf-segments 

 and small flowers with hairy fruit-receptacles. It approaches fluitans and 

 pseudojluitans. The Devonshire plant occasionally has floating leaves, and 

 then it would belong to Baudulii ; it grows in a mill-stream, liable to be 

 mingled with tidal water. 



35. FLUITANS. 



B. aquatilis, 8, Linn. Sp. PI. p. 781 (1753). R. fluitans, De Lamarck, 

 Fl. Fr. vol. iii. p. 184 (1778). R. Jluviatilis, Weber in Wiggers Fl. 

 Holsat. p. 43 (1780) non Bigelow. R. pe/wedanijolius, Gilibert, Fl. Lith. 

 vol. v. p. 262 (1782). R. aquatilis, /3. peucedanijolius, Ilagcn, Ranunc. 

 Pniss. (1783) in Ludw. Del. Opiisc. p. 488 (1790). R. macrophyllus. 

 Pars, in Ust. Ann. 14, 39 (1795). R. peucedanoides, Desf. Fl. Atlant. 



