68 FOUMS AND DISTRIBUTION OF BATRACHIUM.
PI. Ex3. 1859. R. agiint'iUs, a. diver sifolius, Hagen, Eaniinc. Pmss. (1783) in Liulw. Del. Opiisc. p. 587 (1790). R. aquatUis, Tluiill. PI. Far. ed. ii. p. 278 (1799), Naccari PI. Venet. vol. iii. p. 101. n. 510 (1827). R. h^drocharls, A. heteropliyllus, Spenn. PL Prib. p. 1007 (1829). Batrach'mm aquatUe, p. heteropJiyllum, Spach Hist. Nat. Veg. vol. vii. p. 200 (1839). Batrachium, sect. Hetkrophylle/K, Dumort. Mouogr. (1863). B. lideolum, Eevel, Recli. Bot. Sud-oiiest Prance (1865) ; Bull. Soc. Bot. Prance, vol. xii. Eev. Bibl. p. 258 (18 G 5), is a form having the leaves (all) reniforra subrotundo-orbicular, 3-5-fid, with crenate lobes, flowers small, carpels nnmerous, style sublateral, receptacle setose. When in nearly dry places the stem is procumbent and the floating leaves are subreniform, tripartite, with more or less di- vided lobes, and the submersed leaves multihd with linear segments, the state is R. aquatills, C. anomalus, Liljebl. Sw. PL p. 229, ex Schlechtendal ; R. aquatiUs, a. heterophi/Uus, ccenosns, Moris PI. Sard. vol. i. p. 26 (1837); R. aquatilis, y. terrestris, Godr. When the floating leaves tend to become capillary, as in Biria, Hist. Eenonc. t. 1. f. 27, the state is called radlatus [see Boreau, PL Cent. Pr. ed. 3. voL ii. p. 11 (1857)] or fissifoUns [see Schlecht. Berol. PL vol. i. p. 303 (1823)]. When submersed leaves are entirely absent (a very rare occurrence in the oq/uiiilis group), the state is called isophyllits [see Pries, Sum. Veg. Scand. vol. i. p. 26 (1846)] ; and when this takes place in shallow places which subsequently become dry, so that the lower leaves wither and the upper only remain, the state is R. aquatilis a. anomalus, Retz ex Schlechtendal. Batrachium heterophylhim, var. crassi- caulis. Pries, Sum. Yeg. Scand. vol. i. p. 140 (1846) is a succulent state with swelled stem, large flowers, many stamens, and about a hundred glabrate carpels arranged in a large head ; perhaps a state oi Baudotii. Porms 8-19.
8. TRIPARTITUS.
ii;. tripartitus, De Cand. le. PL Gall. Par. p. 15. t. 49 (1808) excl. Syn. Thor., non Auct. Brit, nee Nolle (1828), nee PL Dan. t. 1993. R. tripartitus, a. micranthus, De Cand. llegn. Veg. Syst. Nat. vol. i. p. 234 (1818). Batrachium. tripartitum, S. P. Gray, Nat. Arr. Br. pi. 2. 721 (1821). R. hydrocharis, A. heterophyllus, y. tripartitus, Spcnn. PL Prib. (1829).— Pig.— Sturm, Deutschl. PL Hf. 67 ; Peichb. PL Germ. 3. 2 ; Godr. Essai, f. 3 ; Cosson and Germ. Atl. t. 1. f. 7, 8.
Occurs in Prance, Germany, Portugal, Spain (Willkomm ! a weak state with long and slender petioles and without submersed leaves, and with the floating leaves nearly tripartite, and also with the receptacle setose and sometimes conical ; approaches interuiedius, Lobhii, nndteiiellus, as well as tripartitus). Another plant in flower from Portugal (AVel- witsch 1 PL Lusit. Exs. 409) without floating leaves and resembling confervoides, is R. tripartitus, (3. suhmersus, Godr. in Gren. and Godr. PL Pr. vol. i. p. 20 (1848). Pries states in Sum. Veg. Scand. vol. i. p. 140 (1846), that the ])resence of floating leaves is necessary for the production of flowers in R. tripartitus, De Cand., in consequence of the peduncles springing only from the axils of the floating leaves.
R. aquatilis, A. heteroph/llus, a. lejospei'mns, Wallr. Sched. Crit. 282 (1822). R. Fetiveri, Koch, Syn. PL Germ, et
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