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 



