144 
RANUNCULUS 
Camb. Brit. FI. iii. Plate 150. (a) Plant in flower. (b) Receptacle (enlarged). ( c ) Petal (enlarged). 
(d) Flowers, (e) Achenes (enlarged). Cornwall (C. C. V.). 
Exsiccata : — Billot, 2802 bis, as R. baudoti var. terrestris. 
This is the mud-form of the variety. It is without floating leaves; and the submerged leaves have thicker and wider 
segments. 
(7) forma submersus comb. nov. ; Batrachium mari)ium Fries FI. Suec. Mant. iii, 51 (1842)!; R. baudoti var. 
submersus Grenier in Grenier et Godron op. cit. p. 22 ; Rouy et Foucaud op. cit. p. 66 ; form marinus Hiern in 
Journ. Bot. ix, 103 (1871) including form salsuginosus. 
leones ; — FI. Dan. t. 2776, as Batrachium marinum. 
Exsiccata: — Dorfler, 4810, as R. marinus ; Fries, ix, 28, as B. marinum ; Schultz, xx, 1903, as R. 
marinus. 
This is a water-state of the species without floating leaves. It occurs, for example, in shallow and strongly brackish 
water, and is often ill-developed, having then few segments to the leaves, quite small flowers, very few stamens, and fewer 
and smaller achenes. This small state has flowers very much like those of R. tripartitus, except that the petals are not 
acute or subacute. We have seen it growing in the Isle of Wight and in Forfarshire; and it no doubt occurs elsewhere. 
Local, in stagnant and usually brackish water or water with a high mineral-content, in lowland 
and usually maritime or submaritime situations ; Cornwall and Kent northwards to Zetland ; here 
and there in Ireland. 
Scandinavia, Denmark, Germany, Holland, Belgium, France, southern Europe (Spain and Portugal 
to Greece) ; northern Africa (Algeria) ; Palestine. 
R. obtusiflorus x tvichophyllus (cf. page 150). 
19. RANUNCULUS TRIPHYLLUS. Plate 151 
Ranunculus triphyllus Wallroth in Linnaea xiv, 584 (1840); Willkomm et Lange Prodr. FI. Hisp. 
iii, 309 (1880); Babington Man. ed. 8, 7 (1881) ; R. hydrocharis form triphyllus Hiern op. cit. 69 (1871) pro 
max. parte; R. diversifolius race triphyllus Rouy et Foucaud FI. France i, 64 (1893). 
leones : — Syme Eng. Bot. i, t. 19, as R. [ aquatilis subsp.] heterophyllus. 
Camb. Brit. FI. iii. Plate 151. (a) Flowering branch, (b) Submerged leaf out of water. ( c ) Petal (en- 
larged). (d) Achenes (three enlarged). Jersey (E. W. H.). (The original drawing of this plate was named 
R. triphyllus var. obtusilobus Wallr. by Mr W. P. Hiern.) 
Exsiccata : — Dorfler, 5203, as R. triphyllus. 
Branches elongate. Submerged leaves petioled ; segments capillary, spreading like the rays of a 
fan, collapsing when taken out of the water. Floating leaves more or less deeply divided into 3 — 5 
lobes ; lobes variously cut or undivided. Pedicels about as long as or rather longer than the 
leaves, ascending, recurved in fruit. Receptacle sparsely hairy, subglobose. Flowers about 2 cm. 
in diameter ; April and May. Petals contiguous, longer than the sepals. Stamens rather few. 
Achenes rather numerous, glabrous. 
This species is a link connecting the series Tripartiti with the series Aquatiles. It occurs in Jersey, where we gathered 
it in late April, 1914, in three distinct stations. Previous to that date, we had thought it more closely allied to R. aquatilis 
than it really is. It is really closely allied to R. obtusiflorus , and is sometimes mistaken for that plant. It is also sometimes 
confused with “ R. heterophyllus ” (cf. Syme loc. cit.). 
Rare and rather critical, in ponds; Jersey (!), Devonshire (spec.!), Surrey, Worcestershire 
(W. P. Hiern in Bot. Exch. Club Brit. Is. Rep. for 1914, p. 112), and doubtless elsewhere. 
Germany, France, Austria, Russia (Hiern loc. cit.), and probably elsewhere. 
Subseries ii. Fluitantes 
Fluitantes nobis. For characters, see page 141. Only British species: — R. fluitans. 
