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.
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