97
��ON THE FORMS AND DISTRIBUTION OVER THE WORLD OF THE BATRACHIUM SECTION OF RANUNCULUS.
By W. p. Hiern, M.A.
{Concluded from p. 69.)
• (Plate CXV.)
12. triphyllus.
Ji. triphyllos, Wallr. in Linnsea, vol. xiv. p. 584 (1840) R Petiveri p. major, Koch, Syn. Fl. Germ, et Helvet. ed. ii. p 13 (1843) R he- terophyllus,Wits (part) (1845). BatracUum heterophylhm, Fries (part) i\aV'^ »?««/«/^s, var. 8. tri'partitus, Koch in Sturm. Deutschl. Fl M. 67. f. (1835). R. Friesli, Beurl. Botan. Notis. 1852, p. 156 non Hartm. ^
Occurs in W. Russia, EnoJand (Surrey, state with small flowers, ap- proachmg Godronii, but with glabrous carpels), France. Wallroth -iyes three varieties,— a. obtusiloba, lobes of floating leaves blunt ; B. acuttloba lobes of floating leaves acute ; y. schlzoloba, lobes of floating leaves usually stalked, deeply and irregularly divided in linear segments. Differs from eLomjatus by its glabrous carpels.
BatracUum lieterophylhim, S. F. Gray, Nat. Arr. Brit. PI. vol. li. p. 721 (1821). Ranunculus aquatilis, Godr. Essai (1839) Forms 13-19. ^
R. peltatus, Schrank, Baier. Fl. vol. ii. p. 103 (1789). R. hydrocharis, A. heterophyllus, yS. peltatus, Spenner, Fl." Frib. (1829). Batracldum peltatum, Fries, Sum. Veg. Scand. 1. p. 141, and var. kophyllum, Fr. 1. c. (without capillary leaves) (1846). Batracldum setigeruni, Fries, Bot. Uttl. (1852, 3), ex Hartman (1861). Forms 13-16. Fio- — Rchb. Fl. Germ. 3. 3, " R. aquatilis, y8. heteropJiyllus^sub- peltatus; R. aquatilis, terreslris, heterophyllus;' (1838) Schkuhr, Handb. 1. 152, " R. heterophyllus" (1808). Cossoii and Germ. Atl. t. 2. f. 3. According to Fries, floatin^r leaves are necessary for the production of flowers m peltatu'^, in consequence of the peduncles springing only from the axils' of the floating leaves ; this statement, however, does not ao-ree with my experience. °
The very remarkable form figured in plate 115 has peltate leaves, very finely and deeply decomposed so as to simulatre submersed leaves. It was gnth(,'rcd by Mr. P. Gray in August 1845, from the margin of the 'Castle Loch, Loch- maben Dumfries, Scotland ; it is best refen-ed to R. peltatus bchrank, var. fssifolins, but it has some approach to B Pe- tiveri Koch. R. (BatrachiumJ hypotrichus, Turcz. in Bull de Mosc. vol. ii. p. 275 (1854), has its floating leaves pilose below and subcoriaceous ; it appears to be referable here and to approach R. tnnacrius ; it may, however, be a state of radians. VOL. IX^ [APRIL 1, 1871.] H
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