98 FORMS AND DISTmBUTION OF BiTRACllIUM.
13. ELONGATUS.
R. elonrjntm, Bntrachium elongntam, P. Schultz ! iu ' Billotia,' vol. i. p. 113. n. 3802 (1869). R. aqnat'dis^ y. qiiinqiielobus, Koch in Sturm. Deutschl. Fl. Hf. 67. f. (1835), seems scarcely to differ, except that the lobes are more uniformly rounded and nearly equal.
Occurs in Lapland (Fellman ! 3, a poor specimen, from the Arctic re- gions, seems to belong here), England (Hampshire!, Lancashire qn'mque- lobus), Wales, France, Germany, Spain. R. aquutilis, heterophjllus, sub- truncatm, Rchb. Fl. Germ. vol. iii. p. 3, is intermediate between elon(/atits and truncatus.
14. PENICILLATUS.
Batrachium penicillatum, Dumort. Monogr. Batr. p. 12 (1863). R. aqna- iilis, a. lougifuliiia, Rossmann, Beitr. Kenntn. Wasserhahu. p. 58 (185-t). R. aquatiUs, ^3. heterophyllns, siibtruncati(S, pleiopetalus, Rclib. Fl. Germ. 3. t. 3 (1838). R. pseudojiiitiins, Bab., minore parte (1867). R. pdta- ius, y. pseiuhjiuitans, Syme, part (1863)".
Occurs in England, Ireland, Belgium, France, Germany, and probably in other countries. Differs homjl/ntaii-i, with which it is likely to be con- founded, by its hairy receptacle, and from psendojlnitans by the presence of floating leaves. The petals are occasionally more than five in number, as is also the case in fitdlans. E. Fries in ' Botaniska Notiser' for 1845, p. 122, reports " Batrachium quoddam singulare penicUlatum'" from the Malar Lake, in Sweden, having leaves with long petioles, and with very numerous but quite short setaceous segments in a very dense pencil. He was uncertain whether these characters would prove constant, and I have no further information regarding the plant.
15. FLORIBUNDUS.
R. aquatiUs, a. peltatus, Koch in Sturm, Deutschl. Fl. Hf. 67. f. (1835). R. aquatiUs, a. cordatus, Doll, Rheinisch. Fl. p. 549 (1843). R.Jloribundas, Bab. in Ann. Nat. Hist. ser. 3. vol. xvi. p. 397 (1855). R. irii/acrius, E. and A. Huet du Pavilion in Plant. Sic. Exsicc. n. 1 (1856, state deprived of submersed leaves). Batrachium aquaiile and iioribundum, Dumort. Monogr. Batr. p. 1»2 (1863). R. pdtatus, ^. flori- hnndus, Syme (1863). Fig.— Fl. Dan. t. 2416; Eng. Bot. Suppl. 2969.
Occurs in England, Scotland, Ireland, France, Sicily, Spain, Portugal, S. E. Europe, Smyrna, Algiers, etc. R. aquaticus, var. irUubus, Frivaldczky ]\IS. Rumelia. 1837. A common and widely distributed form, especially in Europe.
16. TRUNCATUS.
R. aquaticus, /3. truncatus, Koch in Sturm, Deutschl. Fl. Hf. 67 f. (1835). R. peltatus, ^^.\.c. 1855 (nearly). Batrachium. truncatum, Dumort. Monogr. Bat. p. 11 (1863). R. peltatus, a. vulgaris, Syme (1863) (nearly). Fig.— Eng. Bot. Suppl. t. 2965 (not good).
Occurs in West Russia (Herb. Fl. Ingric. Cent. ix. n. 12 !), Britain, Belgium, France, etc., Teneriffe (state always with glabrous carpels, often with very large flowers and numerous veins on the petals, s.\i\iYOd.Q\img penicillatus, E. Bourgeau, PI. Canar. n. 407 !).
R. diversifolius, Srhrank, Baier. Fl. p. 103 (1789). Ba- trachium heterophylhim. Fries, Sum. Veg. Scand. i. p. 140. part (1846). R. hjdrocharis, A. hderophyllus, a. vulgaris Spenncr, Fl. Frib. (1829). Forms 17-19.
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