FORMS AND DISTRIBUTION OF BATKACHIUM. 67
Occurs in Scotland, England, France, Germany, Italy, Sicily, Spain, Portugal (teste Machado), Algeria ((Josson ! state approaching Lenor- iiiandi), (Switzerland, Holland, Denmark, Belgium, j\Iid-Kussia, and Transylvania, teste Nyman). Probably a floating state of IiedercefoUHS.
R. Imh-raccHs, Biria, Hist. Ecnonc. p. 33 (1811), Brebiss. PI. Nor- mand. cd. iii. p. 7 (1859). R. heck' race us, var. b. ercctns, Brebiss. 1. c. (an upright state, reported from Virc, France). Batmcldnm heihraceum, Dumort. Florul. Belg. (1827) ex Nyman.— Fig.— Curt. Fl. Lond. vol. i. t. 95.
Occurs in Norway, Sweden, Denmark, Holland, Scotland, England, "Wales, Ireland, Belgium, France, Germany (Mid-llussia and Transylvania, teste Nyman), Spain, Portugal, Algeria, Newfoundland, Rocky Mountains (state with larger flowers and more numerous stamens than in the type, approaching Z«/or«2ff«o'i). Leaves sometimes opposite. Salisbury's name hedera^oUus I have used for this form, though he doubtless meant it to be a mere synonym of hederaceus.
R. mtermedius, Knaf in Flora, vol. xxix. p. 289 (1846), non Poir. BatracJuum inter iiiedinm, Nyman, Syll. Fl. Europ. p. 175 (1854-5). R. tripartitm, Auct. Brit. — Fig. — Eng. Bot. Supp. t. 2946.
Occurs in England, Wales (teste Babington), France, Bohemia, Por- tugal. Leaves sometimes opposite. In some states very like Lenormandi, but differs by presence of hairs on the receptacle ; differs also from tripar- titns by the absence of submersed leaves, by its less deeply divided floating leaves and usually by a difterent habit.
R. nqiiatilis, Linn. Sp. PI. 781 (1753), non Hook. f. et T. Thorns. (1855), nee Godr. (1839). R. capillaris, Gaterau in PI. Montauban, p. 102 (1789). Forms 8-35.
Linnaeus gave four varieties of this, which are mentioned lielow under the names litter opliyllas, circiiiatus, j^ectinatas, and flidtans. De Lamarck divided it into two species, aquatlcus and jluitans ; Brotero, in a difl'erent manner, into two, lieterophijllm and pan- tothrlx ; and various later writers into several others. The petals are occasionally more than Ave in number, as, for example, in peni- cillatns, floribundas, Drouetii, and Jlieita us, though in all the forms five is the normal number.
R. aquaticHS, Lara. Fl. Fr. vol. iii. p. 184 (1778), non Benth. (1858). R. aqiiatilis, a. /3. y. L. (1753). R. aqnatiUs, Willd. Sp. pi. 2. 1332 (1779). Forms 8-34.
This can usually be separated from fiidtaus by the slenderer or shorter segments of the sid:)mersed leaves (which are nearly always present) and by the hairy receptacle ; but neither of these character^ is quite trustworthy. When the petals are equal to or shorter than the sepals, the state is called by Schlechtendal in Aniraadv. Ran. p. 10 (1819) R. aquaiilish. parvijiorus, after a small-flowered variety of R. aquatUis, L., first noticed by Catherine Ellen Dorrien in Nas. p. 196 (1777). (See note under rhlpiphylUis, n. 17). I have seen an example of this from the neighbourhood of Leipzig.
R. heteropJiylliis, Weber in Wiggers, Prim. Fl. Holsat. p. 42 (1780). 7^. aquatiUs, a. Linn. Sp! PI. 781 (1753). R. diversi- foUus, Gilibert Fl. Lithuan. vol. v. p. 261 (1782), non Boiss. et Kv.